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What’s All This About the Rice’s Whale?

What’s All This About the Rice’s Whale?

Recently I participated in a local festival to educate the public about the Rice’s Whale – the newly described species in the Gulf of Mexico that is now listed as critically endangered, possibly the most endangered whale in the world’s oceans.  I honestly did not know enough about it to provide much education and chose to do terrapin conservation at my table instead (something I know more about) but have since learned much about this new member of the Gulf community.

One of the more frequent comments I heard during the event was “I did not know we even had whales in the Gulf”.  This is understandable since we rarely see them – most of us have never seen one.  When we think of whales we think of colder climates like Alaska, New England, and the colder waters off California.  But many large whales must give birth to their smaller calves in warmer waters – so, they make the trek to tropical locations like Hawaii and Florida to do so.  But there are also resident whales in the tropical seas.

You first must understand that the term “whale” does not only mean the large creatures of whale hunting fame, but any member of the mammalian order Cetacea.  Cetaceans include both the large baleen whales – like the blue, gray, and right whales – but also the toothed whales – like the sperm, orca, and even the dolphins.

The Right whale is another critically endangered whale found in the Gulf of Mexico. Image: NOAA.

There are 28 cetaceans that have been reported from the Gulf, 21 of those routinely inhabit here.  Most exist at and beyond the continental shelf – hence we do not see them.  Only two frequent the waters over the shelf – the Atlantic Bottlenose Dolphin and the Atlantic Spotted Dolphin, and only one is routinely seen near shore – the Atlantic Bottlenose Dolphin.

 

This image shows the location of the continental shelf and thus the location of most of the whales found in the Gulf of Mexico. Image: NOAA.

But offshore, out at the edge of the continental shelf, exists several species of large and small cetaceans.  The endangered Sperm, Sei, Fin, Blue, Humpback, and Northern Right whales have been seen.  Of those only sperm whales are common.  Others include several beaked whales (which resemble dolphins but are much larger), large pods of other species of dolphins, pygmy and dwarf sperm whales, pygmy and false killer whales (as well as the killer whale itself), and other baleen whales such as the Minke and Bryde’s whale.

The Bryde’s whale is one of interest to this story.

The Bryde’s whale (pronounced “brood-duss” – Balaenoptera edeni) is a medium sized baleen whale, reaching lengths of about 50 feet and weighing 30 tons.  It is often confused with the larger sei whale.  They are found in tropical oceans across the planet and are not thought to make the large migrations of many whales due to the fact it is already here in the tropics for birth, and its food source is here as well.  They reside in the northeastern Gulf of Mexico extending from the DeSoto Canyon, off the coast of Pensacola, to the shelf edge near Tampa.  They appear to travel alone or in small groups of 2-5 animals.  They feed on small schooling fish, such as pilchards, anchovies, sardines, and herring.  Their reproductive cycle in the Gulf is not well understood.

The Bryde’s whale was thought to be the only resident baleen whale in the Gulf of Mexico. Photo: NOAA.

Strandings have occurred – as of 2009, 33 have been logged.  There are no records of mortality due to commercial fishing line entanglement, but vessel strikes have occurred.  Due to their large population across the planet, they were not considered for listing under the Endangered Species Act, but that may change in the Gulf region due to human caused mortality.  Between 2006-2010 it was estimated that 0.2 Bryde’s whales died annually due the vessel strikes.

In the 1960s Dr. Dale Rice described the Gulf of Mexico population as a possible subspecies.  It is the only baleen whale that regularly inhabits the Gulf of Mexico.  And ever since that time scientists examining stranded animals thought they may be dealing with a different species.

In the 1990s Dr. Keith Mullin began examining skull differentiation and genetic uniqueness from stranded animals of the Gulf population.  Dr. Patricia Rosel and Lynsey Wilcox picked up the torch in 2008.  In 2009 a stranded whale, that had died from a vessel strike, was found in Tampa Bay and provided Dr. Rosel more information.  In 2019 a stranded whale, that had died from hard plastic in gut in the Everglades, was examined by Dr. Rosel and her team and, with data from this skull, along with past data, determined that it was in fact a different species.  The new designation became official in 2019.

 

The newly described Rice’s whale only exists in the Gulf of Mexico. Photo: NOAA.

The new whale was named the Rice’s whale (Balaenoptera ricei) after Dr. Dale Rice who had first describe it as a subspecies in the 1960s.  With this new designation everything changed for this whale.  This new species only lives in the Gulf of Mexico, and it was believed there were only about 50 individuals left.  Being a marine mammal, it was already protected by the Marine Mammal Protection Act, but with this small population it was listed as critically endangered and protected by the Endangered Species Act.

New reviews and publications began to come out about the biology and ecology of this new whale.  Rice’s whales do exist alone or in small groups and currently move between the 100m and 400m depth line along the continental shelf from Pensacola to Tampa.  Diet studies suggest that it may feed near the seafloor, unlike their Bryde’s whale cousins.  They may have lived all across the Gulf of Mexico at the 100-400m line at one time.  They prefer warmer waters and do not seem to conduct long migrations.

The area where the Rice’s whale currently exists. Image: NOAA.

Being listed under the Endangered Species Act, NOAA National Marine Fisheries (NMFS) was required to develop a recovery plan for the whale.  NMFS conducted a series of five virtual workshops between October 18 and November 18 in 2021.  Workshop participants included marine scientists, experts, stakeholders, and the public.  There were challenges identified from the beginning.  Much of the natural history of this new whale was not well understood.  Current and historic abundance, current and historic distribution, population structure and dynamics, calving intervals and seasonality, diet and prey species, foraging behavior, essential habitat features, factors effecting health, and human mortality rates all needed more research.

At the end of the workshop the needs and recommendations fell into several categories.

Management recommendations

  • Create a protected area
  • Restrict commercial and recreational fishing in such – require ropeless gear
  • Require VMS system on all commercial and recreational vessels
  • Require reporting of lost gear and removal of ghost gear
  • Risk assessment for aquaculture, renewable energy, ship traffic, etc.
  • Prohibit aquaculture in core area and suspected areas
  • Reduce burning of fossil fuels
  • Prohibit wind farms in core area
  • Renewable energy mitigation – reduce sound, night travel, passive acoustic
  • Develop spatial tool for energy development and whale habitat use
  • Require aquaculture to monitor effluent release
  • Develop rapid response focused on water quality issues
  • Develop rapid response to stranding events
  • Reduce/cease new oil/gas leases
  • Reduce microplastics and stormwater waste discharge
  • Work with industry to use technologies to reduce noise
  • Reduce shipping and seismic sound within the core area
  • Restrict speed of vessels
  • Maintain 500m distance – require lookouts/observers while in core
  • Consider “areas to be avoided”

Monitoring recommendations

  • Long-term spatial monitoring
  • Long-term prey monitoring
  • Electronic monitoring of commercial fishing operations
  • Necropsies for pollution and contaminants

Outreach and Engagement are needed

Top Threats to Rice’s Whale from the workshop Include:

  • Small population size – vessel collisons
  • Noise
  • Environmental pollutants
  • Prey – Climate change – marine debris
  • Entanglement – disease – health
  • Offshore renewable energy development

The Endangered Species Act (ESA) requires the designation of critical habitat for listed species.  In July 2023 NOAA proposed the area along the U.S. continental shelf between 100-400 meters depth as critical habitat.  Comments on this designation were accepted through October 6, 2023.

The proposed protection zone for the Rice’s whale including the core area. Image: NOAA.

 

Vessel strikes are a top concern.  It is understood that the most effective method of reducing them is to keep vessels and whales apart and reduce vessel speeds within the approved critical habitat.

On May 11, 2021, NOAA Fisheries received a petition submitted by five nongovernmental agencies and one public aquarium to establish a year-round 10-knot vessel speed limit in order the protect the Rice’s whale from vessel collisions.  The petition included other vessel mitigation measures.  On April 7, 2023, NOAA published a formal notice in the Federal Register initiating a 90-day comment period on this petition request. The comment period closed on July 6, 2023, and they received approximately 75,500 comments.  After evaluating comments, and other information submitted, NOAA denied the petition on October 27, 2023.

NOAA concluded that fundamental conservation tasks, including finalizing the critical habitat designation, drafting a species recovery plan, and conducting a quantitative vessel risk assessment, are all needed before we consider vessel regulations.  NOAA does support an education and outreach effort that would encourage voluntary protection measures before regulatory ones are developed.

On that note, the Bureau of Ocean Energy Management (BOEM) did issue voluntary precautionary measures the industry could adopt to help protect the Rice’s whale.  These include:

  • Training observers to reduce vessel collisions.
  • Documenting and recording all transits for a three-year period.
  • All vessels engaged in oil and gas, regardless of size, maintain no more than 10 knots and avoid the core area after dusk and before dawn.
  • Maintain 500m (1700 feet) distance from all Rice’s whales.
  • Use automatic identification system on all vessels 65’ or larger engaged in oil and gas.
  • These suggestions would not apply if the crew/vessel are at safety risk.

So…

This is where the story is at the moment…

This is what is up with the Rice’s whale in the Gulf of Mexico.

We will provide updates as we hear about them.

 

References

 

1 An Overview of Protected Species in the Gulf of Mexico. NOAA Fisheries Service, Southeast Regional Office, Protected Resources Division.  2012.  https://www.boem.gov/sites/default/files/oil-and-gas-energy-program/GOMR/NMFS-Protected-Species-In-GOM-Feb2012.pdf.

 

2 Rosel, P.E., Mullin, K.D. Cetacean Species in the Gulf of Mexico. DWH NRDA Marine Mammal Technical Working Group Report. National Marine Fisheries Service. Southeast Fisheries Science Center.

https://www.fws.gov/doiddata/dwh-ar-documents/876/DWH-AR0106040.pdf.

 

3 A New Species of Baleen Whale in the Gulf of Mexico. 2024. NOAA Fisheries News.

https://www.fisheries.noaa.gov/feature-story/new-species-baleen-whale-gulf-mexico.

 

4 Rice’s Whale. NOAA Fisheries Species Directory.

https://www.fisheries.noaa.gov/species/rices-whale.

 

5 Rice’s Whale. Marine Mammal Commission.

https://www.mmc.gov/priority-topics/species-of-concern/rices-whale/.

 

6 Rice’s Whale: Conservation & Management. NOAA Species Directory. 2024.

https://www.fisheries.noaa.gov/species/rices-whale/conservation-management.

 

7 BOEM Issues Voluntary Precautionary Measures for Rice’s Whale in the Gulf of Mexico. 2023. U.S. Department of Interior. Bureau of Ocean Energy Management.

https://www.boem.gov/newsroom/notes-stakeholders/boem-issues-voluntary-precautionary-measures-rices-whale-gulf-mexico.

 

8 NOAA Fisheries Denies Petition to Establish a Mandatory Speed Limit and Other Vessel Mitigation Measures to Protect Endangered Rice’s Whales in the Gulf of Mexico. NOAA Fisheries News. FB23-079. Gulf of Mexico Fishery Bulletin. October 27, 2023.

https://www.fisheries.noaa.gov/bulletin/noaa-fisheries-denies-petition-establish-mandatory-speed-limit-and-other-vessel-0#:~:text=NOAA%20Fisheries%20denied%20a%20petition,with%20rulemaking%20at%20this%20time..

 

9 Petition to Establish Vessel Speed Measures to Protect Rice’s Whale. NOAA Fisheries. Protected Resources and Actions.

https://www.fisheries.noaa.gov/action/petition-establish-vessel-speed-measures-protect-rices-whale.

 

10 Denial of Gulf Protections Could Lead to the “Permanent Loss” of Rice’s Whale. Jim Turner. WUSF News. October 31, 2023.

https://www.wusf.org/environment/2023-10-31/denial-of-gulf-protections-could-lead-to-the-permanent-loss-of-rices-whales.

A Day at the Beach

A Day at the Beach

I might shock a few people when I say this, but I’d rather be out in the bay somewhere rather than the beach. I just feel like I always bring a gallon of sand back on me even after washing down before getting in the car. However, there is one activity that will always get me out on the beach, and it just so happens to be the right time of the year for it. Florida Pompano (Trachinotus carolinus), aka Pompa-Yes, have started to cruise the white, sandy beaches in search of food as they migrate west to their breeding grounds. While out on a fishing trip this past weekend, the Pompano (and every other fish) eluded me, but I was blessed with an amazing array of wildlife.

When I first arrived at my spot just to the east of Portofino Towers, I was greeted with a pair of Sanderlings (Calidris alba) playing the “water is lava” game while taking breaks between waves to argue with each other and probe the sand with their beaks from marine invertebrates. When I was doing more research on sanderlings, one comment I saw was that they ran like wind-up toys, and that’s the truth! They were pretty brave too, not a single footprint of mine in the wet sand didn’t go un-probed. Sanderlings are “extremely long-distance” migratory birds that breed on the arctic tundra close to the North Pole and winter on most of the sandy beaches in the Gulf of Mexico and around the world. Non-breeding sanderlings will often stay on sandy beaches throughout the summer to save energy. They were great entertainment for the whole fishing trip.

Sanderlings

Sanderlings in the Tide Pool – Thomas Derbes II

Brown Pelicans (Pelecanus occidentalis) were out in numbers that day. I am not the best photographer, but I was very proud to capture a Pelican mid-flight. These birds are residents of the Florida Panhandle year-round. If you’ve ever been to Pensacola, you might have bumped into one of the many Pelican Statues around the area, and they’re pretty much the unofficial mascot of the area. I am always amazed at how these seemingly big, clumsy birds can effortlessly glide over the waves and water as if they are the Blue Angels doing a low-pass. Pelicans were almost wiped out by pesticide pollution in the 1960’s, but they have made an incredible comeback.

Pelican Flying Over The Waves

Brown Pelican – Thomas Derbes II

While I was waiting for a Pompano to bite, I had a visit from a small Atlantic Stingray (Dasyatis sabina) that was caught in the tidepool that was running along the beach. He didn’t seem injured or sick, so I quickly grabbed a glove and released him into the gulf. Stingrays are pretty incredible creatures and can get to massive sizes, but they do contain a large, venomous spine on their tail that poses a threat to beach goers. They are not aggressive however, and a simple remedy to make sure you don’t get hit is to do the “Stingray Shuffle” by shuffling your feet while you move in the water to scare up the stingrays.

Stingray

Atlantic Stingray Cruising the Tide Pool- Thomas Derbes II

As I was getting ready to pack up, I noticed a new shorebird flying in to investigate the seaweed that had washed up on shore. I had a hard time identifying this bird, but once I was able to see it in flight with its white stripe down the back, I realized it was a Ruddy Turnstone (Arenaria interpres). Turnstones get their name from their foraging behavior of turning over stones and pebbles to find food. Even though we do not have pebbles, the turnstone was looking through the seaweed for any insects or crustaceans that might be an easy meal. Turnstones are also “extremely long-distance” migratory birds breeding in the arctic tundra with non-breeding populations typically staying on sandy beaches during the summer. The turnstone made sure to stay away from me, but I was able to get a good photo of it as it ran from seaweed clump to clump.

Stoneturner

Ruddy Turnstone – Thomas Derbes II

While I didn’t catch anything to bring home for dinner, I did get to enjoy the beautiful day and playful wildlife that I wouldn’t have experienced sitting on a couch. You can turn any bad fishing day into an enjoyable day if you pay attention to the wildlife around you!

Oyster Predators in the Florida Panhandle

Oyster Predators in the Florida Panhandle

Even though oysters have a hard shell that even humans have a hard time opening, they do have natural predators in our waters that can easily slurp up a couple dozen. Your usual oyster slurping suspects include oyster drills, blue crabs, and fish (such as the black drum).  In this article, we will focus on the 3 major predators that contribute the most toward natural mortality in oysters here in the Florida Panhandle.

The Oyster Drill

When it comes to the marine snail world, oyster drills would win an oyster-eating contest. Oyster drills (Urosalpinx cinerea) are marine gastropods that grow to sizes of 0.5 – 1 inch. Oyster drills can be found all along the Atlantic coast of North America and the Gulf of Mexico, and they have been accidentally introduced into Northern Europe and the West Coast of North America. These small but mighty snails have become specialized in consuming oysters. Using chemotaxis, they locate their prey oyster. Once they find it, they secrete an enzyme to soften a portion of the oyster shell. Once softened, they drill into the shell and siphon out oyster meat. Oyster drills have been known to occur in great numbers when the environmental conditions are prime and can wipe out not only entire oyster beds but also clam beds. Oyster drills do have natural predators as well, but these predators also consume oysters.

Oyster Drill
An Oyster Drill (Urosalpinx cinerea) – Barnegat Bay Shellfish

The Blue Crab

Most of us know about the very tasty blue crab (Callinectes sapidus), but many do not know that it is a major consumer of oysters, especially on an oyster farm. Blue crabs are a decapod crab (meaning 10 legs) of the swimming crab family Portunidae. Blue crabs can indeed swim and their last leg on each side has developed into what are called paddle fins.  Juvenile oysters are the main target for blue crabs, but they have been observed eating adult oysters when given the opportunity. On an oyster farm, blue crabs can get into an oyster bag when they are very small. Once inside, they have an all-you-can-eat buffet of oysters, and can quickly wipe out a bag of oysters. Oyster farmers have to be very cautious and must either remove the blue crabs manually or dry their bags out in hopes of destroying any blue crabs. Blue crabs can easily break open a juvenile oyster, but for them to consume an adult oyster, they will wait for it to open to feed before shoving a claw inside of the shell to keep the oyster open. Once they have their claw in the shell, they will use their other claw to consume the oyster.

Blue Crabs on a table
Blue Crabs (Callinectes sapidus) Pulled Out Of Oyster Bags – Thomas Derbes II

The Fish

Even though oyster-eating fish like black drum (Pogonias cromis) and sheepshead (Archosargus probatocephalus) are much bigger than snails and crabs, they tend to contribute less to oyster mortality on oyster farms. However, during certain seasons wild oysters and other shelled invertebrates can contribute up to 33% of a black drum’s diet (more here). Fish will usually congregate around oyster beds and farms, but they are more interested in consuming oyster predators like crabs and snails. The black drum is a fish that was built for oyster consumption. While black drum lack sharp teeth, they have crushing plates in their throat that can crush an oyster shell which allows the drum to eat the oyster meat. Many oyster farmers welcome these fish on their farms as a free source of anti-fouling and predator deterrent (in the form of consumption).

Black Drum
Black Drum (Pogonias cromis) Caught On A Whole Oyster – Thomas Derbes II

There are many more oyster predators, but these are the top 3 in terms of threat and ability to consume/do detriment to oyster beds and farms in the Florida Panhandle. While oyster drills rank up towards the top, crabs and fish can also greatly contribute to natural mortality.

References

Flimlin, G., & F Beal, B. (n.d.). Major Predators of Cultured Shellfish. https://shellfish.ifas.ufl.edu/wp-content/uploads/Major-Predators-of-Cultured-Shellfish.pdf

Tagging Wildlife Part 2 – Leatherback Sea Turtles

Tagging Wildlife Part 2 – Leatherback Sea Turtles

The leatherback sea turtle is the largest of the five species that have been found in the northern Gulf of Mexico.  With a carapace (top shell) length between 6-7 feet and weighing between 800-1000 pounds it is truly a magnificent creature.  Any encounter with them is amazing. 

Most encounters occur with fishermen or divers who are out searching for artificial reefs to fish or dive.  Though very rare, they have been known to nest in this area.  They feed exclusively on jellyfish and will follow them close to shore if need be.  But what do leatherbacks do with most of their time?  Do they hang offshore and follow jellyfish in?  Do they circle the entire Gulf of Mexico and we see them as they pass?  Based on past studies, many encounters with this turtle occur in the warmer months.  They often become entangled in commercial fishing longlines set in the central Gulf of Mexico.  But what do they do during the fall and winter?  One of the tagging projects presented at a recent workshop tried to answer that question. 

The project was led by Dr. Christopher Sasso of the National Oceanic and Atmospheric Administration.  The tag chosen for this was a satellite tag.  Since the leatherback must surface to breath air, and often is found near the surface following jellyfish, orbiting satellites would be able to follow them.  As we mentioned in Part 1, catching the creature is step 1, and catching a six-foot 1000-pound sea turtle is no easy task. 

The team used a spotter aircraft to locate the turtles.  Once found, the pilot would radio the chase boat who would zip in with a large net.  The net was connected to a large metal hoop and was designed to give way once it was around the turtle.  Once in the net the turtle was hauled onto a small inflatable boat where the work of tagging could be done.  They would measure the animal, take blood samples, place a PIT tag within them (similar to a microchip in your pet) and then attach the satellite tag by a tether to the tail end of the turtle before releasing it.  The entire operation took less than 30 minutes.    

Between 2015-2019 19 leatherbacks were tagged in the northern Gulf.  17 of these were females and 2 were males.  Data obtained from these tags ranged between 63 and 247 days at liberty.  The behavior the team noticed was divided into foraging behavior (feeding on jellyfish) and transiting behavior (direct swimming ignoring all). 

The turtles foraged in this part of the Gulf until the fall season.  At that point most of them moved south along the Florida shelf, past the western peninsula of the state, heading towards the Keys.  A few chose to swim directly south against the Loop Current, and a small number remained in the area. 

Those moving along the Florida shelf appeared to be foraging as they went.  Those crossing the open Gulf may have foraged some but seemed to be focused on getting south to the nesting beaches.  Almost all of the turtles entered the Caribbean on the east side of the Yucatan channel, following the currents, with their final destination being their nesting beaches.  When they returned, they did so in the warmer months and used the western side of the channel – again following the currents – until they once again reached the northern Gulf and foraging began again.  One interesting note from this study, the two males tagged did not leave the Gulf.

The tagging studies do show that leatherbacks use the Gulf of Mexico year-round.  They usually head south to the Caribbean when it gets colder and use the currents to do so.  It is during the warmer months we are most likely to see them here foraging on jellyfish.  It is an amazing experience to encounter one of these large turtles.  I hope you get to experience it one day.

Satellite tracks of leatherback movement in the GoM. Red (2015), Blue (2018), Black (2019). Image: Sasso (et.al.) 2021.

Reference

Sasso, C.R., Richards, P.M., Benson, S.R., Judge, M., Putman, N.F., Snodgrass, D., Stacy, B.A. 2021. Leatherback Sea Turtles in the Eastern Gulf of Mexico: Foraging and Migration Behavior During the Autumn and Winter. Frontiers in Marine Science., Vol. 8., https://doi.org/10.3389/fmars.2021.660798.

Local Oysters Displaying “Green Gills” 

Local Oysters Displaying “Green Gills” 

And it’s a good thing! Green gill oysters are prized in the oyster community. In the Carolinas and Northern France, green gill oysters are a seasonal, cherished crop and a product of the saying “You are what you eat!” The phytoplankton, Haslea ostrearia, is the typical culprit, and their distribution is measured by direct observation from plankton tows or the occurrence of green-gilled oysters. The exact distribution is unknown, but there are reports of H. ostrearia throughout the Atlantic, Pacific, and Indian oceans. Haslea ostrearia is a beautiful pennate diatom that contains a water-soluble blue pigment known as marennine (More Here). Marennine’s production is stimulated by long photoperiods, blue light, and high light/low cloud weather. It can also be released into the water and into the flesh of organisms (typically oysters) that consume them.

Green-gill oyster on the farm
Fresh out of the water Grayson Bay Oyster with green gills! – Brandon Smith, Grayson Bay Oyster Company

Pensacola Bay, and surrounding areas, had a pretty mild fall in terms of rainfall, and the bays have turned a beautiful green-blue hue as the bays have risen in salinity and phytoplankton typically found in the Gulf of Mexico were able to survive. Brandon Smith, owner of Grayson Bay Oyster Company, was out working his farm January 7th, 2024, and sent a text to me saying “take note of the green gills,” and I was very shocked and happy to see actual, green-gilled oysters in our local waterways. He graciously harvested a few dozen to examine (and let me taste test), and I was able to confirm the presence of green gills in the oysters. After further research on H. ostrearia, it seems as though the pennate diatom made it into our bays and is the culprit of this wonderful surprise.

Oyster displaying green-gills
A local Grayson Bay Oyster displaying green-gills – Thomas Derbes II

When I shucked my graciously donated oysters from Grayson Bay, I was reminiscing on the first time I came across green-gilled oysters. The first batch of green gill oysters I ate came from an oyster farm in North Carolina called N. Sea Oyster Company. Their green-gilled beauties “Divine Pines” were requested by a wedding I was catering for, and I was able to slurp down one to get talking and tasting notes. The seasonal Divine Pines offered a sweet yet salty taste and became one of my favorite out-of-area oysters to serve at events and to personally consume. While beautiful, the green-gilled oysters are usually only found in the fall/winter months. These green-gilled Grayson Bays were very comparable and offered a salty yet very sweet and minerally finish. The H. ostrearia is responsible for not only the green gills, but the sweet tasting notes, and I highly recommend adding any green-gilled oyster to your fall/winter raw bar selection.   

References:

Turpin, Vincent & Robert, J-M & Philippe, Goulletquer & Massé, Guillaume & Rosa, Philippe. (2008). Oyster greening by outdoor mass culture of the diatom Haslea ostrearia Simonsen in enriched seawater. Aquaculture Research. 32. 801 – 809.

From Seed to Shuck – More Oyster 101

From Seed to Shuck – More Oyster 101

When you hear about oyster farming, you typically hear the word “seed” and how it is highly important to the future of the farm. While it might not be a typical seed that produces agricultural crops like corn, this seed is a living, breathing (albeit in the water) organism that produces a beautiful, cupped oyster. Depending on market size demand and requirements, it could take anywhere from 8 to 24 months to reach “shucking ready” size. Let’s take a dive into the timeline of an oyster, from seed to shuck.

Cooler Full of Seed Headed To Farm
A cooler full of R6 oyster seed headed out to the farm – Grayson Bay Oyster Company

Oyster farmers typically buy seed from an oyster nursery or hatchery, where they carefully spawn male and female oysters together in individual spawning chambers. Depending on the farmer’s needs, they can produce either diploid or triploid oyster larvae (more on triploids next week). These larvae are free-swimming for the first 2-3 weeks of their life until they develop into pediveligers (Oyster 101). Hatcheries will, for lack of better terms, mix the pediveligers with very tiny grains of ground-up oyster shells. These pediveligers will then attach to a single grain and begin to form into a “seed” oyster. Seed costs range and vary from year to year, and this cost is usually one of the biggest financial purchases oyster farmers can make. Seed is sold by size, starting at 6 millimeters (typically called size R6), and by increments of 1,000. Hatcheries and nurseries are located all along the Gulf Coast, but Florida law requires seed put in the Gulf of Mexico waters and estuaries must come from Gulf of Mexico hatcheries, and the same rules apply to Atlantic waters.

Oyster Seed
Oyster Seed (>R16) – Thomas Derbes II

Once purchased, these seed oysters make it to their homes in beautiful nutrient-rich waters and grow at a steady rate, and can reach an overall size of 2 inches in 4 to 9 months. During those months, the seed are filtering gallons of water per oyster per day, helping sequester carbon in their shells and consuming large amounts of plankton and algae that could contribute to the eutrophication of the bays. Oyster farmers will check on the seed almost weekly, changing bag mesh sizes and sorting the seed by size. Farmers will also take this opportunity to check for any oyster predators and swiftly evict them from their all-you-can-eat buffet. Sorting is done by using a “tumbler” that has a long drum with holes of varying sizes. This tumbler also helps clean the oyster and chip away at the lip of an oyster shell, causing the oyster to grow deeper and create a beautiful cup.

Farmed oysters do not have a size limit, but most farmers stick to a 2.5 to 3-inch size oyster. These oysters have filtered over 7,000 gallons of estuary water individually and sequestered a very generous amount of carbon, in the form of calcium carbonite (more here), in their shells in their first year of life. Once deemed ready for harvest, farmers will pull them out of the water and get them quickly in the fridge, following strict biosecurity guidelines and regulations to provide a safe product year-round.

Oysters of varying size
Some oysters are fast growers! These were apart of the same spawn. – Thomas Derbes II

And there you have it, from seed to shuck. With the holidays coming up, and seafood sometimes being a part of the holiday plans, reach out to the local oyster farmers in your area to reserve a dozen or two for your favorite uncle. You can also wow the crowd with this very fancy mignonette recipe below! 

Lemon Champagne Mignonette

Juice From 2 Local Meyer Lemons (They’re in Season!)

1 Shallot Chopped Finely

½ cup Champagne Vinegar

¼ cup Red Vinegar

1 tbsp each of Green and Pink Peppercorns 

24 Local Farm Raised Oysters (For the Environment!) 

1.       In a bowl, add the juice of Meyer lemons and shallots. Let it marinate for 10 minutes.

2.       Add champagne vinegar, red vinegar, and peppercorns to the lemons and shallots.

3.       Chill for at least 30 minutes in the fridge.

4.       Shuck oysters and top with freshly made mignonette. Enjoy!