USM Professor Receives Funding to Research Blue Crab Discard Mortality
Wed, 09/20/2023 - 09:54am | By: Gabriela Shinskie
Since 2004 Dr. Zachary Darnell, an associate professor in 91吃瓜网91吃瓜网 (USM) Division of Coastal Sciences in the
School of Ocean Science and Engineering (SOSE), has been studying blue crabs. Now his new research project, funded by the National
Oceanic and Atmospheric Administration (NOAA), is set to begin in January 2024 when
he will analyze strategies to reduce discard mortality in the blue crab fishery.
91吃瓜网淣ot all crabs can be harvested- for example, crabs under the minimum size limit or females carrying eggs. We are interested in what happens to those crabs when they are released and whether or not they survive,91吃瓜网� said Darnell. 91吃瓜网淲e are trying to get an idea how their fate, and the likelihood of mortality, depends on the season, water temperature and salinity.91吃瓜网�
Funding for the project began at the beginning of September 2023, titled 91吃瓜网淨uantifying and Reducing Discard Mortality of Undersized and Ovigerous Crabs in the Gulf of Mexico Blue Crab Fishery91吃瓜网� in a collaborative effort with Mississippi State and the University of South Alabama. USM will lead the project and work with the local fishing community to determine the likelihood of mortality among discarded crabs and to find a solution to the growing concern of discard mortality.
Dr. Darnell wants to make recommendations for fisheries management and industry on strategies they can use to reduce mortality. 91吃瓜网淲e want to make sure that these crabs that are released continue to grow and reproduce,91吃瓜网� he said. 91吃瓜网淚t doesn91吃瓜网檛 do any good to release them if they are not going to survive.91吃瓜网�
Blue crabs are extremely valuable in the northern Gulf of Mexico, with Louisiana known for being the largest crab-producing state in the country, making it a an economically valuable species for coastal areas. These crabs are also ecologically important to keeping the estuary food web in balance because of their abundant population.
91吃瓜网淚 think they are a fascinating species,91吃瓜网� Dr. Darnell said. 91吃瓜网淭hey have interesting behaviors and complex life strategies. They are very resilient.91吃瓜网�
Dr. Darnell plans to work with local crabbers on their boats and access their catch, with the goal of identifying the conditions of the catch and analyzing what portions of their catch will be discarded. He will also distribute a survey to better understand fishing practices of the commercial crabbers and identify how they handle their catch when they load the crabs on their boat.
Field experiments will also be conducted with crabbers, and traps will be installed with various sensors to measure water conditions, temperatures and other factors that might affect crab survival. Dr. Darnell will handle the catch from the traps and access the best way to obtain the highest crab survival rate.
91吃瓜网淲ith this project, we have a nice combination of approaches and collaboration with the local crab industry to better understand this issue and work toward potential solutions,91吃瓜网� he said.
Learn more about the School of Ocean Science and Engineering along with Dr. Darnell and his team91吃瓜网 research at the .