Highlights

  • Demand for Florida stone crab is on the rise with prices at all-time highs.
  • Researchers are working to help crab populations and support the fishery.
  • A recent research study found that traps may not be a source of concern for the crab populations.

Florida’s stone crab industry contributes $30 million to the state’s economy each year and is one of the most expensive seafoods you can buy. The price and value of stone crab claws are steadily increasing, so researchers are working to ensure the crab population stays healthy and bountiful, while satisfying consumer demand.

Almost all — 99% — of stone crab claws are harvested in Florida and in 2020, stone crab claw earnings came in second, behind only shrimp, according to the Florida Fish and Wildlife Conservation Commission.

Stone crab is unique in that it is a “claw only” fishery. This means that the stone crab claws are harvested by removing the claws from the crab and returning the live animal to the ocean.

Similar to how lizards can drop their tail when trying to escape, stone crabs can drop their claws voluntarily and grow them back later.

“Because they can regenerate their claws and reproduce after that, people think of them as a renewable resource,” said Katherine Rose, UF/IFAS Extension and Florida Sea Grant agent. “But recent research shows that crab claws are not regenerating at the rate we thought they were, and removal may reduce their chance of survival more than we originally thought.”

Depending on the size of the crustacean’s claw, fishers can take one or both. Recent studies have shown that removal impacts crabs’ behavior and potentially their chance of survival after declawing.

Data show that if you take both claws, there’s a 60% chance the crab will die before it regenerates and 40% if you take one claw. Overall, 13% of them die just from being handled.

Then, consider that the animal’s life span averages six to eight years, and it takes about two years to regenerate a legal sized claw, the fishery may not be as sustainable as scientists originally thought.

“Now that we know more about the impacts of taking the claws, we wanted to understand an earlier part of the catch process when the crabs are trapped,” said Rose. “We were curious if that time spent in the trap impacted the survival rates of the crabs once claws were taken.”

We want to keep populations healthy while also ensuring the fishery continues and can deliver a healthy, delicious seafood product to consumers

Katherine Rose

A typical commercial fishery places crab traps approximately 14 days before they pull up the trap to collect the crabs and harvest their claws. However, this time frame can range from three to 35 days.

In that time, some crabs that enter the traps early may go without food. The crabs are often concentrated in traps at larger numbers than normal, which can be stressful. Researchers wanted to understand how this might further stress the crabs and their ability to survive after claw removal.

“The good news is that our study found that crabs fared well in the traps,” said Rose. “While this is the first study of its kind, and a small piece of the overall puzzle to better understand stone crab health in the fishery, we think it’s a good first step.”

Researchers measured nutrition indicators from the crabs’ time without access to food as well as their reflexes to see if their reactions were present as a means of measuring vitality. They saw nutritional decline. Despite that, the crab’s reflexes were fine.