Here we are once more with the intention of sharing information about these beautiful marine gems. On this occasion will continue with the subject of natural pearls and specifically about how these gems are created in nature.
During the era scientific enlightenment in the late 1800′s, scientists from all over the world were searching to understand how pearl oysters were able of producing pearls, and their discoveries were fascinating. But some of the first things they discovered at to do with the internal structure of the pearl, since in order to obtain the truth it was necessary to cut open pearls and inspect their core. And what they found is that pearls are very much like onions, at least structurally.
When an onion is cut in half what we see inside are numerous concentric layers, each stacked on the previous one, and in a similar manner pearls are produced: the original seed that caused the pearl to originate will be found at its core, surrounded by millions of micron thin layers of Aragonite. Perhaps this is a reason why the ancient Greeks gave the name “Margarita” to the pearl, since this is also the word for “onion” (hence the name “Margaritifera” that was given in early times to many pearl producing mollusks, meaning “pearl bearer”) in that language.
The Inner structure of an Onion (left) and a Natural Pearl (right).
In the above images of an onion and a natural pearl (both cut-in-half) we can see their internal resemblance, and going further into the deeper core we can also appreciate how their core is not round, but with each additional coating of nacre (in the case of the pearl) the shape becomes rounder, softer, although most natural pearls I have personally seen are rarely 100% round, most being baroque and a good proportion of them being semi-baroque in shape (mainly in the shape of buttons, bullets and drops).
But of course we do have several types of natural pearls. Many don’t look like the image that we have in our brains as being a pearl, but they are nonetheless pearls. We basically have two major groups of natural pearls: blisters and loose pearls. Of these two groups we would have subgroups as well. Let us begin with the pearls that could be considered the most common.
Blister pearls
Perhaps some of the most common natural pearls are those usually referred as blister pearls in English, “ampollas” in Spanish or as “ampulles” in French, and we could even say that these laid the foundation for the eventual production of mabé pearls (also known as blister or half pearls). These pearls are commonly found formed on the pearl oyster’s shell, as a response from a very active “Bio-terrorist” (usually an animal that actively drills through the oyster’s shell). The reasons for this active attack on the oyster’s shell are varied and depend on the species that attacks the oyster, blister pearls being the result of the oyster’s defense mechanism against these intruders.
The varieties of organisms that “attack” the oyster’s shell are huge and include animals such as sponges, polychaete worms and drill mussels. Many of these creatures are not really after the oysters flesh, meaning there not there to actually eat the oyster but that they are actually just looking for a “home” and have been known as “domiciliares” because they usually make their homes inside the oyster’s shell and -unfortunately for the pearl oyster-these actually weaken the shell, making it really brittle and easy to break. Of course, these “Bioterrorists” will also come in direct contact with the oyster’s flesh and this interaction will almost certainly produce blister pearls.
There’s a variety of sponge known as, usually colored with a bright orange red or yellow with a sticky consistency, which grows on a large variety of shellfish here in the Sea of Cortez, and it seems to have a preference for the black-lipped pearl oyster (Pinctada mazatlanica). It can cause small lump like blisters, but I have never seen any pretty specimen of pearl caused by this sponge.
Another creature capable of causing blister pearls is the infamous drill mussel or pholids. These creatures –and here I also have to include the Cliona sponge- are actually filter feeders just like pearl oysters are, so we can be sure that they don’t attack the shell to eat the oyster’s flesh, but they have brittle shells so they need the protection of a hard substance around them. These little creatures can actually bore stone, wood as well as sea shells. We have seen numerous blister pearls formed by the attack of these agents, as well as in one loose pearl. These creatures also have a preference for black-lipped pearl oysters, but may occasionally attack older individuals of the rainbow lipped pearl oyster variety (Pteria sterna).
The group of organisms which we find more interesting in the case of pearl formation of the polychaete worms, mainly those of genus Polydora: slender worms usually with a bright red coloration. These worms have the capacity to infest pearl oysters to the point of weakening them and causing their death and in the process making the oyster produce numerous “mud blisters”, which may eventually become coated with nacre.
Shell Damage caused by Drill worms and Drill Mussels
Mud Blisters
We have examined several varieties of the so-called mud blisters and in most instances where we have found are the remains of dead drill worms, as well as good quantities of very organic mud. It would be difficult to fully identify what causes this variety of blister pearl, but I believe that it is safe to say that it is a combination of the worm´s drilling activity and the entrance of mud due to the disappearance of the drill worm. What caused the drill worm to disappear? Well, we have also seen large numbers of predatory polychaete worms on the oyster’s shell and these may very well go after the drill worms and kill them, leaving their home vacated.
When removing a mud blister and cutting it in half we usually find a protective coating of protein secreted by the pearl oyster that that helps to coat the organic mud and that is in turn coated with nacre.
Unusual blister pearls
Some very unusual specimens have been found that include other varieties of animals as the cause, these include fish and crustaceans. Perhaps the most interesting specimen is that of a small fish that was found in the shell of a Mexican black lip pearl oyster that was fished in Baja California during the last days of the 19th century (this specimen is still kept in the American museum of natural history in New York). The fish was identified as a “pearl fish” (family Carapidae), which are usually associated with many species of clams and oysters and sea cucumbers (please use this link if you want to see an animated diagram of a pearl fish, if you’re a proctologist you will enjoy this). And although we have seen these fish inside oysters we have never had the fantastic opportunity of finding a “fish pearl”.
Pearl fish are not parasitic but instead they find shelter within the oyster’s shells. I believe most oysters would not be offended by the presence of this little fish, but in this particular case may be the little fish died and the oyster preceded to rapidly coat it with pearl or nacre, I don’t believe this could’ve ever happen with a live fish.
Other possible sources for blister pearls
Other organisms that could be turned into pearls -but that I have never seen turned into pearls- are the little shrimp and crabs that are found inside pearl oysters. The little translucent “pearl shrimp” are also found in many other species of clams, such as pen shells, and are typically found within the large Pinctada oysters. The species we find in the Sea of Cortez is Pontonia margarita, and we can usually find two individuals within an oyster (one male and one female, the male usually being the smaller of the two), this species does not seem to affect the pearl oyster.
Another type of crustacean we have seen inhabiting the oyster’s body is the “pea crab”; these little crabs are somewhat soft and quite clumsy, no wonder they need the protection they find inside an oyster’s shell. These little crabs have only been reported as found living inside the Australian silver lip pearl oyster (Pinctada maxima), but the Sea of Cortez has a variety that is only found within the rainbow lipped pearl oyster (Pteria sterna) and this will be the first time this will be reported in writing. The name of this species is still unknown (Pinnotheres sp.) and we usually only find one inside an oyster. We have seen some crabs causing a disturbance within the oyster that could eventually lead to the production of blister pearls, but we have yet to find a “crab pearl”.
So, what do you think about all the life-forms that depend or use a pearl oyster -in a way or another- for their survival? Life is indeed a web, and if you can save one species you will be offering an “umbrella” of protection for many others…
In our next chapter will continue talking about natural pearls and their possible origins, in the meantime I will continue hunting for additional facts and -of course- searching for more mythical pearls: I can clearly see myself wearing a pea crab pearl pendant.
Well, although we have not had many direct comments on our blog, we do have a tool that allows us to know how many daily visitors we have, it also tells us which posts have yielded a higher amount of visits and what people are searching for (keywords) before they “land” on our blog and, based on this, we can say that the favorite topic so far is the one about how to distinguish between real pearls (both cultured and natural) and imitation pearls or “faux perles” (such as ” Mallorca Pearls”). Therefore, we will continue discussing this issue and, once again, I invite you to submit your comments.A New Option: The Pearl’s Drill-Hole
Comparing drill-holes: true pearl vs. imitation pearl
Drill-Holes of various types of fake pearls. Top: 2 “Mallorca” pearls. Center: Philippine SSP imitation pearl and a “Shell pearl” black pearl imitation. Below: Australian SSP imitation “Pearl shell”.
Analyzing Pearl Jewelry:
The gold setting on this pearl does not allow us to examine its drill-hole.
Colorful Mexican baroque pearl necklace: you can appreciate the knots between the pearls as well as some of the drill-holes.
A string of "Mallorca Pearls” where you can see that there are no knots between the so-called-pearls and you can also notice some plastic shavings or “burrs” around the drill hole.
I’ve just returned from a dizzying trip to the always impressive Californian metropolis, where I joined a select group of “Pearl-People” (people linked to the pearl industry) to discuss a subject that we always discuss: pearls, pearls and more pearls. The interesting thing about such events is that they involve people who are in different areas of this field: pearl farmers, nuclei producers, wholesalers, retailers, designers, gemologists and collectors. In all: quite an interesting array of areas of expertise and depth of knowledge.
A total of 16 people were invited to the “Pearl Ruckus 2010″, an event that was promoted by Jeremy Shepherd, CEO of “Pearl Paradise“, by “Jewelmer” and by “Classical Wines of Spain”. The event included five conferences, as well as several social events where the pampered guests would enjoy fine Spanish wines, exquisite sushi and even indulge in a bit of Whiskey tasting. We were treated like royalty…and as such, pearls adorned all the fair ladies at the event.
Conferences – Saturday 24
Beginning at 10:30 am and ending at around 4 pm, we were fortunate to attend the presentations by the following lecturers:
Blaire Beavers (GemGeek): A comprehensive lecture on “Exotic Pearls”, among which Blair talked about the New Zealand’s Abalone Mabe pearls, the large orange-colored “Melo-Melo” Conch pearls, the giant pearls of the Tridacna, the beautiful and elusive Nautilus pearls (a relative of “Paul the Octopus“) and, of course, the “Cortez Pearl”. I do have to point out that GemGeek recently visited our farm (last May),but she seemed fascinated by our local fare of regional seafood, and this was quite evident in the presentation, which included pictures of the fish tacos and other delicacies.
Michael Rivers (Mikeyy): Mike’s lecture gave us a very comprehensive, interesting and detailed description of the mother-of-pearl industry of the United States, from the early 20th century to the present; it included pearl mussel fishing methods, the production process of mother of pearl buttons and of the core of most cultured pearls: the little nacre bead. The talk ended with a discussion on the future of this industry.
Renné Newman: This renowned gemologist gave her presentation on the “Zhuji Pearl Market, China” and -much to our delight- she presented the 5th Edition of her famous book “The Pearl Buying Guide“. I must admit that we learned a lot about pearl quality by using the first edition (1992) of this book and that it made us very happy to see several new sections and photographs about our “Sea of Cortez Pearls” in this new edition.
Steve Metzler (smetzler): who has made an incredible effort towards the identification and certification of two types of extremely rare natural pearls: the pearls of the “giant clam” (Tridacna) and those of the cephalopod Nautilus. This research is carried out by specialists from Spain (Dr. Checa & Dr. Cartwright) and we cannot yet disclose information any about it … the information will be published within a few months. Steve’s collection of natural Tridacna and Nautilus pearls is simply unparalleled.
Douglas McLaurin (CortezPearls): Who, as always, was enjoying himself with his presentation about the “History of the Gulf of California Pearl”, with information ranging from the pre-columbian period to the present, including details of the pearl fisheries made by Spanish-Soldier-turned-Millionaire Manuel de Ocio, the farming methods of Don Gaston Vives and the short-lived farm of Don Manuel Lozano Gallo, then easing into the 1990′s research stage and, finally, the commercial aquaculture in Guaymas, Sonora.
Dinner:
What I can say I that I did not mentioned before? We had the most excellent hosts in Jeremy Shepherd and lovely Hisano Takei (who wore a beautiful kimono), we had Sushi chef Hitori Hirata preparing delicious sushi, the best caviar I’ve had, a fine selection of Spanish wines, including a delicious Galician Albariño wine, we had a “Scotch Whiskey Tasting event” with the help of Michael Udhe, and to wrap it all up: the excellent comradeship amongst the guests at this unique event.
I consider myself fortunate to have been invited this year and, God willing, there will be more Mexican Pearls at the 2011 Pearl Ruckus next year …
That’s right, we have already published on the web -thanks to YouTube- our Original video on “Sea of Cortez Pearls.” This was a project we had in mind for several years, but we never had the time to invest in an “original production”. The video reached a good compromise between what we wanted to play on the video, yet we could not achieve such as: we wanted a video clip of a hurricane in action on the pearl farm … but when this happens one usually take refuge, or we wanted ”special clothing” (we could not shoot a troop of “Spanish Conquistadores” trudging through the desert) and, we have not been able of finding a professional narrator (primarily due to time constraints) for the Spanish version of the video… but the English version has superb narration.
Despite being produced in 2008 (it achieved “Gold” status on December of that year) we had the video available only on DVD throughout 2009, and it was until this year that we decided to share it publicly. The video is presented in two parts due to time constraints imposed by YouTube. The first part is a presentation of the Gulf of California Pearl:its lore and History; the second part deals with the commercial cultivation of pearls in Guaymas, Sonora. So, with no more hesitation: we hope you enjoy the video…
UPDATE (APRIL 2011): Well, YouTube has increased the time limits on videos to 15 minutes and now offers HD… so, I have been able to update the video and now you only have to click on it to watch the full version (13 minutes) in Hi-Def. Hope you like it!
We thank all those who participated directly in this beautiful project, specially the staff at “Cheque’s Films”: our good friends Ezekiel “el Cheque” Núñez and Esteban Ibarra (who were in charge of cameras and video editing); the original “Perlas del Mar de Cortez Soundtrack” was the work of Jaime Delgado Avelar, the excellent voice narration by the professional narrator Charlie Bloomer, and photos taken by yet another good friend, Alberto “el Gordo” Tirado. Another couple of good video details provided by our friend Benito Sarmiento (thank you for allowing us to use your videocam and “underwater casing” as well as for lending us your aerial video of Bacochibampo Bay), and finally, the great 3-D work of the “Spanish Galleon” done by Abraham Castro of “Onix” fame. In all, this video was fully made in Guaymas, Sonora.
The script for the video was produced by us (“pearl trio”), in addition to some video footage and photos that we did and incorporated into it.
Additional thanks? Sure! There are many people who we would like to give special thanks, and amongst them we have:
“The Yaqui Diver”/Adrian Amarillas Casillas, our friends Rocio Mendoza and Diana Alvarez, as well as to Karla Valdez, Sergio Farell -our friend and former mentor- the “Tec de Monterrey” for showing faith in our school project and, of course, our group of “Yaqui Workers” led by Jesus “el Pipi” Valenzuela.
I invite you to please leave your comments … I know that in order to leave a comment you are required to use an e-mail account, but for those who do not want to leave a comment because you will “need” to use your e-mail, you can do the following: there is no need to enter a real email … instead use this fake e-mail chachalaca@chachalaca.com.mx (“copy & paste” and place in the appropriate field) and you will see that it is not necessary to use your personal mail.
See you next week!
Myth #2: The Aquaculture of Pearls in Spain
It is fascinating to meet with people from all over the world, specially if they are seasoned travelers…they always have interesting stories to share with us and we appreciated their talk and sharing of experiences, specially when they have previously visited other pearl farms in Japan, Tahiti or Australia EXCEPT when someone comes up with their “Mallorca Pearl Farm Visit”. The typical description is that they have seen divers retrieving the always perfectly round pearls that seem to come in only 4 basic colors.
Spain is, indeed, a great aquaculture producer…but its main products revolve around edible shellfish production: scallops, mussels and edible oysters. These species of bivalves are usually produced in the northern part of Spain, on the coastline of Galicia, where they grow three very tasty and valuable species: the Mussel (Mytilus galloprovincialis), the “Vieira” or Queen scallop (Pecten maximus) and the european rock oyster (Ostrea edulis). But none of these species are able of producing nacreous pearls (they would produce “calcium concretions” or “non-nacreous pearls“) so they cannot look like the “Mallorca Pearl”. Let us look into this more closely then…
The so called production of these famous “european pearls” is found in the city of Manacor, Spain, and… where is this place??? It is a beautiful spot in the Mediterranean Sea (see map, courtesy of Google Earth), an area that has not been known or recognized -not today nor in ancient times- as a great pearl producer. Also, take note that Manacor is on an island…but not right next to the sea but some kilometer away from it. This can only mean then that the pearls and their oysters are being grown in special ponds or lakes or maybe even in rivers… but examining the city with Google Maps or any similar program will not reveal any evidence of large lakes/ponds suitable for a grand scale production of pearl oysters nor mussels.
Very well then… they must grow the pearls and their oysters in the ocean and haul them into the city as needed. What variety of pearl oyster could they use to produce their pearls? Let us do a bit of research…hmm, we seem to find very few sources that include information on pearl fisheries -past and present- inside the Mediterranean Sea. Let us use Sohei Shirahi’s excellent book “Pearls & Pearl Oysters of the World” and let us see…weird… no pearl oysters reported in that area of the Mediterranean. The only information we find is that from another great book -actually a “grand classic” on the subject- Kunz and Stevenson’s (1908) “The Book of the Pearl” which cites that a man by the last name of Vassel states that in 1896 , the “Akoya Pearl Oyster” (Pinctada imbricata) made its way into the Mediterranean by way of the Suez Canal and can now be found in limited areas of Tunisia, North Africa. Yet, there is another pearl oyster in the region: the “Mediterranean Winged Oyster” (Pteria hirundo) which can be found in Turkey and Italy. There is not a single report of these species for the Spanish island of Mallorca. The following map can give us a clearer idea of the worldwide distribution of pearl oysters (based on Shirai, 1994).
Well then, if there are NO pearl oysters nor pearly mussels in Spain nor in its island of Majorca… what gave rise to this myth? It is hard to know, but we all know how half-truths have an easy way of propagating… like summer grass on fire. It is a fact that the Spaniards have always stated that their so-called “pearls” are just as beautiful -or better- than their cultured pearl counterparts, or even state that their product is manufactured using “marine materials” but I have never seen an advertisement or article that states that they “grow” their pearls inside living oysters. But some people are…that is for sure. For what reason or to what ends? You can be the judge. So, let us go to an “official” “Majorca Pearls” website, from where I extracted the following text:
“Majorca pearls are imitation pearls manufactured on the Spanish island of Majorca in the Mediterranean. Local women there have specialized in the artistic fabrication of faux pearls since the 19th Century. These pearls have such a resemblance to the natural cultivated pearls that only experts can tell them apart.”
That last part about only experts being able to tell them apart is a hoax (in future posts we will try to help you identify all sorts of pearls, including fakes…which are very easy).
But for now I believe that it is quite clear that these imitations or “faux perles” are not grown from live organisms, but a product of Human manufacture. But, for those that will still believe otherwise… I have -for the first time on the Internet- a perfectly preserved specimen of the very elusive “Majorcan Pearl Oyster” (scientifically named: Plasticus artifactus). The specimen can be admired at our Museum-like display at the Pearl-Shop in Guaymas, Sonora, Mexico… so stop for a visit, don’t miss on this unique opportunity!
If you have questions or an interesting subject to suggest, please feel free to make your comments known on this Blog…see you in a couple of weeks!
Once more we are here, sharing our thoughts and hearts with you…hoping you will allow us to guide you into the history of the Gulf of California Pearl. I hope you find the story of Dr. Gastón Vivés feats as enthralling as we did when we first learned of his existence in 1991. So this week we continue with the most important area of the “CCCyP” or “Pearl Farm”: the “Raceways” or aquaculture channels.
When flying over Isla Espíritu Santo you will easily be able to distinguish the little bay and estuary where this famous pearl farm once stood, this because you can clearly distinguish the man-made shape of the culture station. This part of Dr. Vivés’ operation was a special as all others, but this one is the one most people can see, touch and easily comprehend in its operation. After almost 100 years of abandonment, harsh weather and even hurricanes, this area is still in good condition but slowly being overtaken by the mangrove forest.
This little “ensenada” or harbor has a small mangrove forest growing in typical estuarine fashion: you have a little inland lagoon with its sides all covered with mangrove trees. Gastón Vivés must have “cleared” some of the mangrove forest in order to improve the pearl culture environment, because pearl oysters are not commonly found inside these lagoons. The problems you usually have when you work in an estuary such as this one are the following:
- Increased salinity levels during summer months
- Decreased salinity levels after the rainy season
- Higher/Lower temperatures than those in the ocean
- Reduced oxygen levels.
- Lots and lots of mosquitoes and some terrible little -almost invisible- bugs we call “jejenes” (No-see-ems???)
But on the other hand you also have important benefits such as:
- Higher than average productivity levels (food)
- Easier handling of animals in shallower water
- Secluded area, easier to protect
So, it is obvious Dr. Vives decided to remove a portion of the mangrove forest and use it to grow his black-lipped pearl oysters (Pinctada mazatlanica) instead. It is hard to know if they dredged the bottom of the lagoon in order to remove the usually black-muck (highly organic mud) that is commonly associated with these forests. It could have been, but maybe they just closed the communication between the ocean and the lagoon…then they cut the trees, allowed the bottom to dry and have workers remove the anoxic muck and then prepare the bottom with more adequate conditions such as “tepetate” rock. This also gave them time to work with the masonry.
Pearl Culture Raceways at Isla Espíritu Santo
I can imagine this was a very intense workload for those involved. Why? Let us go back to 1890 and imagine that the World was different: sailboats on the remotest part of Mexico, a desert island with little or no food and fresh-water available, high temperatures of 45 Celsius (over 120 Fahrenheit) during midday, poisonous snakes and arthropods, mosquitoes, no medical help…you can keep adding it up. So, you not only needed workers, but logistics that are similar to those needed to fight battles and win wars: those that cannot supply their armies are the ones that will loose. And it was an army that Gastón Vivés had to take care of: at the height of the farm’s operation it is said it had over 1,200 men working on the Island.
So, among all the things he had to do is have his workers build barracks and other areas needed to establish and serve a large contingent of people. The docking area would have been important as well, because you need constant transportation of people and goods from La Paz to Espíritu Santo, and drinking water would have been a problem (although several fresh -and some briny- water springs are identified on the island). In order to obtain meat, goats were introduced and allowed to forage the desert shrubbery…something that nowadays is considered an “ecological nightmare” (but in those days the notion of “ecology” was non-existent). Once the whole site was constructed it would no longer be the peaceful island but a noisy bustling place of activity (heck! we’ve got towns in the “sierra” that have only some 88 people… and this place had hundreds of workers!): cooks cooking, iron-smiths bashing iron, carpenters nailing planks, divers, packagers…everything but plumbers and electricians.
The Nursery System
About the Masonry work: marvelous. He had great stone-smiths (for a lack of a better word) that -in my opinion- were serious artists and cared about quality. They used dark/red volcanic rocks to form the canals. Their amazing masonry work looks quite sturdy in most places, but the roots of the mangrove are slowly destroying them…
Inside the canals or water-channels it was possible to see some fish darting in and out (usually the common “Lisa” or “Mullet”), as well as an aggressive little Blue-Crab (Callinectes bellicosus). The water is mainly murky-green: thick and rich with nutrients. The water is shallow and has very little movement, the bottom seems more sandy instead of the black pudding-like muck you find at other estuaries (maybe I just needed to stand there until I sank…but did not have much time).
This place would have looked somewhat different some 100 years ago, because this part of the farm was entirely covered: it had a great “palapa” roof made with palm fronds (I did not see a single palm tree here, so the fronds would have been transported from the mainland as with most other things such as wood) and wood beams (very much like the palapa we employ at our Guaymas pearl farm today).
The reason for these roofs is simple: the sun is strong at this latitude and it warms the water; warmer water usually holds less oxygen and some creatures can suffocate… so, just add some shade and the water’s temperature will be cooler. Smart man. In winter you would have the opposite problem (cold water) so you can remove the palm covering and the water will warm up.
This raceway or canal system was very important because it was the “nursery system”, the place were the delicate little juvenile black-lips would be kept under constant surveillance. Why? Well, he did choose a lagoon…and these are well stocked with blue-crabs and these just adore little oysters for their “botana” (tastier than nachos). So, guards were places on top of the canals, armed with fork-like lancers and ready to defend the little pearl oysters. But many other creatures could have wanted to enjoy a free lunch as well: but mainly the octopus, snails and starfish.
The canals had wooden planks to allow the guards to move easily from one place to another and chase the intruders. Also, when the water from the canals was taken out (during the low tide) people would be able to jump inside and work with the animals, perform close inspection and even remove some predators that could have escaped from the guard’s watchful gaze.
The bottom was “conditioned” as I mentioned before, but the little juveniles were not left on the bottom just sitting. Nope. This was all worked out in detail. The little oysters were introduced inside small metal mesh cages, shaped like rectangles. We found the remains of several of these cages at the island…all oxidized, but of course plastic was unavailable in those days.
These juvenile oysters were obtained using special “spat collectors” (of a special design, and we will talk of these in the near future), and the little creatures must have measured some 3 cm (about 1 inch) when caught.
At this stage, the oysters are quite delicate because their shells are not hard enough to protect them and they have a special “anchoring” system (the bissus) they employ to grab a hold of a rock or coral and it is quite delicate: you should never pull them. Also, their small body size does not give the oyster enough protection from sudden temperature changes (they can heat easily under sunlight, and if placed rapidly in cold water the shock can kill them)… so it seems very likely Dr. Gastón Vivés’ medical training might have given him a very sound foundation to understand the oysters and give them the best possible conditions to improve their growth and survival.
By means of the mesh cages, it was easy to handle many oysters at once and protect them from most predators and he would have been able to reduce mortality rates to very tolerable levels (5-20%) at an age when -if you don’t do the right things- you can have a mortality rate of up to 80%.
Truly a revolutionary man and way ahead of his time… let us continue with this account in the coming weeks. In the meantime, you can watch a small video about our visit to this historical site. The video has titles in Spanish only, but if you read this entry you will be able to grasp the meaning…I will add sub-titles to the video in the future.
And now we will continue with last month’s story about our visit to ruins of the World’s first pearl farm and we will go and revisit each area step by step.
The Arrival
Our boat came to rest on the beach, but not a sandy beach but more of a rocky beach full of large oval-shaped water tumbled rocks that make walking quite difficult. Any of you that have visited the local beaches of “Las Saladitas” and “Piedras Pintas” in Guaymas will understand what I mean: the rocks just slide from under your feet and may make you fall. Our boat remained in the water, in an area that once had some concrete and rock slabs that were used as a ramp for loading and unloading boats and other aquaculture equipment.
Landing at Isla Espiritu Santo
And it is quite interesting to notice that even tough the ramps are not there anymore (maybe underneath many kilos of rocks there could be something) -or they are simply not noticeable- you can still find indications of their whereabouts thanks to the useful tool known as “Google Earth”. Yes, if you examine the satellite images from Ensenada de San Gabriel you can see some areas -inside the ocean- where some lines are perpendicular to the coastline: one of these being the ramps -they had a lot of use, because they were needed for the farm’s aquaculture operations and to provide food and water to the thousand employees they had on this desolate island.
Google Earth images of the Pearl Farm site
Another thing of interest is that, after almost a Century of abandonment and being exposed to countless hurricanes, you can clearly what is left of masonry work and even of the more modest wooden buildings.
Storage Buildings
Walking to our right (to the west of our landing site), at about some 100 meters from the coastline we found a heavily impacted land area: scarce vegetation, some “Chivato” bushes (Calliandra sp) and “Choya Cactii” (Opuntia sp), a marked difference with the typical Sonoran desert vegetation found in the surrounding area: large columnar cactii -mainly Organ-Pipe catus and Barrel Cactus- and spiny shrubbery. Clearly, this land was compacted for use as sheds, shaded storage area and maybe even for barracks for the farm’s workers.
This small video (part 1) of our visit to the farm may give you better insight:
For the most part, the storage sheds must have been built with commercial wood (which we found in a very deteriorated state, possibly cedar wood) with the roofs being built with palm fronds and/or wood planks. What was stored under these? You can imagine that many were used to house your average tools, such as axes, saws, mallets, etc., one of them must have been a small forge to produce nails and work on chains and cages, some used for living quarters and cooking, but what was the purpose of this unique farm? To produce a valuable commodity: mother-of-pearl shell (MOP). We have fist hand information (from writings by Dr. Vivés himself) that shed some light on this beautiful natural product (plastic became an alternative for MOP shell, thus many nacre/MOP producing regions closed-down).
The MOP produced at this farm came from the farm-raised Black-Lipped Pearl Oysters (Pinctada mazatlanica). The company had 4 different grades (or qualities) for MOP shell. This is the information they provided at the end of the Mexican Revolution as to the value for MOP at the International markets:
- “Extra” Grade: made up of large shell (over 15 cm in diameter), with very regular/uniform shapes, without spotting nor drill-worm holes.Valued at $1,000 USD per metric ton.
- “First” Grade: shells with sizes between 9 to 14 cm, without spotting nor holes. Valued at $400 USD/ton.
- “Second” Grade: mainly small shells (sizes between 7 to 9 cm) and “clean” (no spots nor holes), but also mixed in with larger shells (9-15 cm) but with defects and imperfections. Valued at $200 USD/ton.
- “Third” Grade: Mainly consisting of broken shells or with shells with considerable damage (spots & holes) in at least 50% of its surface. Valued at less than $100 USD/ton.
We did find evidence of MOP shell mounds throughout the entire area. Most of the shells having suffered from weathering effects. It is hard to say if these shells are all that was left behind after the destruction of the pearl farm in 1914, or if these are more “recent” shells (no older than 30 years) left behind by fishermen that were illegally fishing them for their pearls. The shells are brittle, have a warm coppery color and most of their protein coating (periostracum) has dissapeared…but are still beautiful and shinny.
MOP Shells
MOP shell had a very important economic value before the use of plastic and was used intensively for the manufacture of buttons, jewelry boxes, knife/firearm handles, jewelry (cameos), chess-sets and even for traditional Asian medicine. Several places flourished economically due to this demand: Broome in Australia (using the large Silver Lip Oyster or Pinctada maxima), Muscatine in the United States of America (using many species of pearly mussels) and -of course- La Paz, Mexico.
As a matter of fact, the main economic source for the farm was the production of MOP shell…the pearls were a much welcomed by product: a gift from God or Nature. In those days only natural pearls existed (cultured pearls were in a research stage in Australia and Japan). Some sources state that the quantity of MOP shell that was exported from the Gulf of California (mind you: these figures do not include the shell that remained in Mexico) between the period comprised by the years 1580 and 1857 was of 95,000 metric tons, roughly converted to 277 tons per year. If we converted this volume to monetary value -using a 3rd grade figure- we are talking about $28,000 USD of 1910 (we would have to convert this figure to its present economic value) which is not bad for those days: $101 USD per ton or…
| $2,350.00 | using the Consumer Price Index | |
| $1,770.00 | using the GDP deflator | |
| $10,100.00 | using the unskilled wage | |
| $15,100.00 | using the Production Worker Compensation | |
| $12,900.00 | using the nominal GDP per capita | |
| $43,100.00 | using the relative share of GDP |
I would personally stick with the “Unskilled wage” indicator… but would really appreciate hearing from others and see if we can come up with a better figure or even for a “real market price” for MOP these days.
Let us try some math here again. This pearl farm (CCCyP ) is said to have had between 8 to 10 million black-lip oysters under culture conditions. Documents from the farm and Dr. Gastón Vivés state that the annual harvest consisted of some 5 million oysters. An average 4 year-old shell measures some 12 cm in diameter and weighs 10 grams and each organism has two of these (=20 grams of MOP per oyster), thus if we extrapolate we will have 200 kilos per thousand oysters, so 1 million oysters might have produced 200,000 kilos and multiplied by 5 we get 1,000 tons of MOP per year. Of course, this information is not accurate because we lack information on the percentage of shell that was discarded due to low-quality (and some other figures that would help have a better price estimate, such as the percentage of their sizes and their grades) but what I want you to NOTICE is how this one farm could have been able to supply the entire export of MOP shell and the domestic market as well, WITHOUT fishing out the local pearl beds.
A pearl farm can indeed have a positive impact on the local environment if managed in a sustainable manner.