Farmed Oysters Never Go Out Of Style

Farmed Oysters Never Go Out Of Style

Growing up in the South, I was exposed to many “Old Wives’ Tales,” ranging from not cleaning your house or clothes on New Year’s Day to the one that everyone, including the northern states, knows, “don’t consume oysters in months without an R.”  While most “tales” are full of superstition, the “R” tale was one of biosecurity, and was mainly truthful until two new types of “R” came about; Regulations and Refrigeration. The tale came about due to the rise in food poisonings from shellfish in the warmer summer months that do not contain a “R,” such as June and July. The rise in food poisoning came about from the practices used by the oyster “tongers” at the time. Commercial harvest of wild oysters is a very labor-intensive job that requires long days on the water and constant tonging, measuring, and sorting of oysters as they come off the bottom. During the summer, the oysters would sit on the deck of the boat for hours in the heat, causing microorganisms and bacteria to flourish inside the closed oyster.  Bacteria, like Vibrio, would replicate to harmful levels inside of the oysters and when consumed by a human, could cause life-threatening illnesses.

That was then, and this is now. While the consumption of wild Florida oysters during the summer is not allowed (closed harvest season for wild oysters during the summer in Florida), you can still find oysters from all over the US, and farmed oysters from Florida are still allowed to be consumed during the summer. Biosecurity is a major factor involving food production and aquaculture, and without biosecurity, the consumption of Florida-farmed oysters would be prohibited. Oyster farmers in Florida must follow a very rigorous biosecurity plan that includes State-issued harvest times, water-to-refrigeration requirements, reporting of harvest and planting, and twice-daily temperature monitoring requirements. The regulations for harvest times and refrigeration requirements have scientific backing, showing a statistical difference in Vibrio concentrations between properly handled oysters and neglected oysters, with properly handled oysters having little to no concentrations of Vibrio. For instance, during the summer months, oyster farmers must have oysters harvested and in the cooler before 11am and down to 45°F within 2 hours of storing in cooler.  

Boat Full of Harvest Oysters
A farmer returns early morning from the lease with harvest oysters covered by burlap. This keeps the oysters “cool.” (Photo by: Thomas Derbes)

While there is an increased concentration of harmful bacteria during these warmer months, properly cared-for oysters help limit the growth and proliferation of the bacteria. Another myth is that Vibrio doesn’t exist in cold, winter waters. Vibrio can exist year-round, and people with health risks, including immune-suppressed patients and those with diabetes, should exercise extreme caution when consuming raw seafood. When purchasing seafood for personal consumption, make sure to bring a cooler with ice and place your seafood above the ice, making sure to not allow any fresh water to touch the seafood. When storing seafood at home, make sure they are in a container that can breathe, and cover with a moist paper towel to keep their gills wet. Oysters are typically good for 10-14 days after the harvest date, so make sure you check the tags and consume within time.

Next summer, when you see farmed oysters on the menu, remember the new R’s and order a couple dozen for the table. The need for support from your local oyster farmer is most needed during those months without R, so slurp them down all summer and thank your local oystermen and women!

Oyster with French Mignonette Sauce
Locally Farmed Oyster with French Mignonette (Photo by: Kelly Derbes)

Easy French Mignonette Recipe

Recipe for 2doz Oysters

¼ cup Red Wine Vinegar

¼ cup Champagne Vinegar

1 tablespoon of Finely Chopped Shallot

1 teaspoon of Fresh Crushed Black Pepper

Juice of ½ Lemon

Combine all ingredients together. Spoon over shucked, chilled raw oysters.

Mercury Contamination in Local Fish

Mercury Contamination in Local Fish

Imperiled (verb) – put at risk of being harmed, injured, or destroyed.

 

In 2021 the Florida Department of Environmental Protection classified 44 area waterways in the Pensacola Bay System as imperiled.  Such designations are based on an environmental parameter making it unhealthy for one reason or another.  When we think of an unhealthy body of water, many times we think of sewage.  There are nine bodies of water in the Pensacola Bay System classified as imperiled due to the fecal bacteria concentrations within.  There are another seven for bacteria levels high enough to close them for shellfish harvesting.  This is a total of 16 bodies of water having bacteria issues (36% of the 44 designations).

Closed due to bacteria.
Photo: Rick O’Connor

 

Low dissolved oxygen and fish kills is another parameter we think of.  There are four waterways designated imperiled due to high nutrients (a cause of hypoxia and fish kills), and one for low dissolved oxygen readings itself.  This is a total of five (11% of the 44 designations).

Dead redfish on the eastern shore of Mobile Bay.
Photo: Jimbo Meador

 

But you may be surprised to learn that 23 of the 44 imperiled water bodies (52%) are designated based on the mercury content of the fish sampled there.

 

Most people are aware of the mercury issue in fish.  Many of those living in the Pensacola Bay area are aware of this issue locally, but they may not be aware that with the 2021 designations, it is the primary reason for many listed.  To be fair, it is not that mercury issues are increasing, it may be more that there are 97 waterways in the Pensacola Bay System being considered for delisting in 2021 and those are listed for a variety of other issues.  What it is stating is that with the 44 that remain imperiled, mercury is the primary cause.

 

We have all heard of mercury in fish, but where is it coming from?  What health problems does it cause?  And is there anything that can be done to make these bodies of water healthier?

 

Mercury is a naturally occurring element on the periodic table.  It is element #80, meaning it has 80 protons and electrons, one of the larger naturally occurring elements.  It is a silver-colored liquid at room temperature, one of only two naturally occurring elements in the liquid phase at these temperatures – the other being bromine.  It is sporadically found throughout the earth’s crust, usually combined with other elements.  There are two forms of mercury – mercury (I) and mercury (II) – indicating the number of cations available for sharing or transferring in compound bonding.  Mercury (II) is more common in nature.

 

 

The element has been of interest to humans for centuries.  There are records of it buried beneath the Mayan pyramids, though we are not sure how it was used, and it was used in Chinese medicine centuries ago.  The Spanish used it to help extract silver from mines during their colonial period around the world.  It was also used in separating fir from skin in felt hat making in the 19th century.  Hatters who used this method eventually had neurological problems and became known as “mad hatters”, an idea used in Lewis Carol’s Alice’s Adventures in Wonderland.

 

In more modern times it has been used in fillings for tooth cavities (including my own) and preserving specific vaccines.  Being a good conductor of electricity and not of heat, it is used in numerous electrical components, fluorescent lighting, and batteries.  Some cultures used it to help “whiten their skin” and a common use is in the processing and production of certain industrial chemicals.  Today, due to the toxic properties of mercury, many of these uses are no longer.

Fluorescent lighting contains mercury.

 

Mercury is obtained for these uses by mining their ores.  The most sought after ore is cinnabar, a red-colored rock found around the world.  Mercury (II) sulflide (HgS) is a common compound found in cinnabar.  When heated and oxidized it will produce sulfur dioxide and elemental mercury.

 

HgS + O2 à Hg + SO2

 

Cinnabar is the most common ore mined for mercury.
Photo: Classic Crystal

 

 

The problem with mercury is that it is toxic, and some forms of mercury are more toxic than others.  The element is known to cause brain, kidney, and lung issues.  It also can weaken the immune system.  It is most known for the neurological problems it causes.  Sensory impairment, lack of motor skill coordination, psychotic reactions, hallucinations, tremors and spasms have all been connected to exposure to mercury.  There are concerns with the neurological development within the fetus if exposed to mercury and many of the health advisories target women of childbearing age who are pregnant or considering it.  They have included the very young and the very old in their recommendations that these members of the population do not eat more than 6 ounces of fish (or shellfish) that have high mercury contamination.

 

Mercury contamination in fish.
Image: BBC

 

 

The organic forms of mercury, dimethylmercury and methylmercury, are the more toxic forms.  These are introduced to the environment both naturally and from human activity.  Once in the aquatic environment they are absorbed by the phytoplankton (microscopic plants in aquatic environments).  Methylmercury accumulates in lipids (fats) within the cell at relatively low concentrations (phytoplankton are not large).  However, they are not passed by the creature.  The slightly larger zooplankton (microscopic animals) feed on the phytoplankton and accumulate the mercury they have stored.  Feeding on a lot of these, they accumulate even more mercury.  The zooplankton are consumed by small fish, who eat a lot and accumulate even more mercury.  Then the mid-sized fish consume them, and the larger fish consume those, and on and on.  The top predators have accumulated enough methylmercury to be hazardous to human health IF they are consumed by people.  This process of increasing the concentration of mercury through the food chain is known as biomagnification – “magnifying the problem”.

 

So, which fish are of concern?

 

Based on the Florida Department of Health for freshwater systems in Escambia County.

  • Bluegill, Channel catfish, Largemouth bass, Long-eared sunfish, Red-eared sunfish, Spotted sunfish and Warmouth from the Escambia River system – you should not eat more than one/week.
  • Do not eat chain pickerel or largemouth bass – and do not consume more than two red-eared sunfish from Crescent Lake.
  • Lake Stone near Century FL – no more than two bluegill and sunfish per week and no more than one largemouth bass each week.
  • From the Perdido River do not eat more than two bluegill or sunfish each week and do not eat largemouth bass from the Perdido River.
  • The same species and regulations apply for the Yellow River system as well.

The following marine species are of concern….

Almaco jack, Atlantic spadefish, Atlantic croaker, Weakfish (trout), Black drum, Black grouper, Blackfin tuna, Bluefish, Cobia, Dolphin, Pompano, Gafftop catfish, Gag, Greater amberjack, Gulf flounder, Hardhead catfish, King mackerel, Ladyfish, Lane snapper, Bonito, Mutton snapper, Pigfish, Red grouper, Red snapper, Sand seatrout, Scamp, Shark, Sheepshead, Snowy grouper, Southern flounder, Southern kingfish, Spanish mackerel, Spot, Striped mullet, Vermillion snapper, Wahoo, White mullet, Yellow-edge grouper, and Yellowfin tuna.

 

In each case it is not recommended eating more than two servings a week.  For a few, it is recommended that the most vulnerable people mentioned earlier not at ANY… Those would include Blackfin tuna, Cobia, King mackerel, Bonito, and Shark.

 

It is recommended that NO ONE eat king mackerel over 31 inches and any shark species over 43 inches in length.

 

I guess as you look at this list, you see fish species that you like.  This list can lead folks to think… “I am just not going to eat seafood”.  This would be a mistake.  The Department of Health has found there are essential vitamins and nutrients provided be seafood that are missing if you do not eat them.  They found additional problems in fetal development when seafood protein was left out of the mothers’ diet.  So, the response would be… eat other seafood species you do not see on this list… or, if you see something you do like, no more than 1-2 6-ounce servings per week.

 

So, is there anything we can do about the mercury issue in our bay system?

 

Well, to have the biggest impact you will need to determine the biggest source.  33% of the mercury in our environment comes from natural sources, such as volcanic eruptions.  We can do nothing about volcanic eruptions, or other natural sources, so we will need to look at anthropogenic (human) sources.

 

The larger sources would be anthropogenic, which account for 67% of the known mercury in the environment, focusing on these can make a large impact.  Coming in at No.1 – producing electricity by burning coal.  This accounts for 65% of the anthropogenic sources.  Moving away from burning coal would make a huge difference.  But that is easier said than done.  Mining and burning coal are important for the economy of many communities.  It is one of the cheaper methods of producing much needed electricity.  But in addition to producing mercury compounds during the heating process, many other toxic compounds are produced and released as well – not to mention the amount of greenhouse gases produced during this process.  Hence the name “dirty coal”.  There are other methods of producing electricity and the solution would be to convert not only the power plants to these methods, but the coal dependent communities to this line of work.  This one step would make a big difference.

Power plant on one of the panhandle estuaries.
Photo: Flickr

 

At a much smaller scale, mining for gold produces 11% of the mercury from the mine tailings, cement production (7%), and incinerating garbage (3%).  Though not a large player in this game, reducing the amount of solid waste burned each year would help reduce the mercury issue.

 

The takeaway here is that the number of imperiled waterways in the Pensacola Bay System have been reduced over recent years and we will look at this in another article.  But for those that remain, mercury is the prime reason.  It is also important to understand that mercury is a naturally occurring element and can not be broken down, so we have what we have – but, we can stop adding to the problem.  Third, eating some seafood each week is good for you.  You will just need to select species that are not problems or watch how much you eat if you prefer some of the listed species.

 

For more information on the 2021 imperiled waterways list visit

https://floridadep.gov/dear/watershed-assessment-section/content/final-lists-impaired-waters-group-4-cycle-2-basins

 

For more on the seafood safety species lists visit

https://dchpexternalapps.doh.state.fl.us/fishadvisory/

 

Other sources for this article included:

 

Wikipedia – https://en.wikipedia.org/wiki/Mercury_(element)

 

Miller, G.T., Spoolman, S.E. 2011. Living in the Environment. Brooks and Cole Cengage Learning. Belmont CA. pp. 674.

Fishing with Vibrio in Florida

Fishing with Vibrio in Florida

During a recent fishing trip, as we jigged for bait and got repeated stuck by the tiny hooks, talk turned to the recent reports of a death and infections in the Florida Panhandle from the saltwater-dwelling bacterium, Vibrio vulnificus. Many reports used the term “flesh-eating bacteria” to refer to Vibrio.  This description is false and misleading and causes unnecessary fear and panic. Most healthy individuals are not at risk for V. vulnificus infection, however, to ensure that your time on the water is safe and enjoyable, be aware of your risk and take steps to minimize becoming infected.

The name Vibrio refers to a large and diverse group of marine bacteria. Most members are harmless, however, some strains produce harmful toxins and are capable of causing a disease known as “vibriosis.” Because of Florida’s warm climate, Vibrio are present in brackish waters year-round. They are most abundant from April to November when the water is the warmest. For infection to occur, pathogenic Vibrio strains must enter the body of a susceptible individual who either eats raw and contaminated seafood or exposes an open wound for a prolonged period in water containing these bacteria.

Symptoms of vibriosis may arise within 1–3 days, but usually occur a few hours after exposure. Infections typically begin with swelling and redness of skin, followed by severe pain, blistering, and discharge at the site of the wound. If you suspect infection, seek medical treatment immediately.

Anglers can reduce their risk by following a few safety tips.  Because fish, including live bait, carry Vibrio on their bodies, avoid or minimize handling whenever possible. The proper use of landing gear and release tools can help to minimize handling. If you cannot avoid handling the fish, use a wet towel or gloves to protect yourself. Be aware of areas that can cause injury like spines, barbs, and teeth.

Always wash your hands thoroughly after fishing, especially before handling food. Be sure to clean your gear after each use, taking special care with sharp objects like hooks and knives.

Adapted from: Abeels, H., G. Barbarite, A. Wright, and P. McCarthy. 2016. Frequently Asked Questions about Vibrio in Florida. SGEF-231.  https://eos.ucs.uri.edu/EOS_Linked_Documents/flsgp/SGEF_231_fact-sheet_2016.pdf

“An Equal Opportunity Institution”

A happy angler with a Trigger fish near Destin, Florida (Photo credit: L. Tiu).