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Sustainable Fisheries and Aquaculture – ARCHIVED FY10-12
Sustainable Fisheries and Aquaculture

Title: Tagging of Horseshoe Crabs in Conjunction with Commercial Harvesters and the Biomedical Industry in South Carolina

Principal Investigator:
Larry DeLancey, S.C. Department of Natural Resources

Project Number: R/CF-14

An appreciable number of short-term bleeding effect studies have been conducted on horseshoe crabs (HSC), but few published long-term studies exist. This study will aid in better assessing potential impacts on the HSC population in South Carolina. By cooperating with this study, the biomedical company will contribute to the long-term management goal of a sustainable fishery. These short-term studies can contribute to evaluating current practices and future management policy.

This research will (1) determine long-term mortality effects of bleeding HSC by the biomedical industry in South Carolina beginning in 2010, (2) determine short-term mortality effects of tagging bled female HSCs by holding in saltwater pond, and (3) reexamine short term effects of bleeding by holding bled and unbled HSCs in pond.


Larry DeLancey

Title: Drought and Decline of Blue Crabs in South Carolina

Principal Investigator:
Michael Childress, Clemson University

Project Number: R/CF-15

The factor most correlated with the recent decline in the annual blue crab landings is increasing salinity from drought. This project will identify the specific mechanism linking salinity to declining crab landings, and evaluate how this issue may be ameliorated by changes in current fishing regulations. Fishermen, resource managers and marine ecologists will all potentially benefit from increased knowledge of how drought will impact the future of SC blue crabs.

The first objective is to experimentally test three hypotheses as to why blue crab landings are negatively correlated with increased salinity. The second is to develop specific recommendations regarding the impact of disease, climate change, and current fisheries management practices on the future of the blue crab fishery. Finally, the PIs will present findings to fishermen, resource managers, and the general public through regular public presentations, State of the Basin reports, and a blue crab forecasting workshop.

Michael Childress

Title: Development of Non-Lethal Genetic Techniques for Age and
Sex Determination in Two Recreationally Important Fishes in South Carolina

Principal Investigator:
Tanya Darden, S.C. Department of Natural Resources

Project Number: R/CF-16

Cobia and red drum were selected based on their importance to the recreational fishery in South Carolina as well as the southeastern US. Both are currently managed species that lack critical life history parameters for all or a portion of their life stages and therefore, future assessments and management will substantially benefit from the inclusion of information developed from these tools.

The three research objectives are to (1) develop and test genetic aging tools for red drum and cobia, (2) develop and test sex-linked molecular markers for red drum and cobia, and (3) disseminate and publicize project results.

Tanya Darden

Title: Evaluating the comparative survival and growth of diploid and triploid single Eastern oysters in South Carolina

Principal Investigator: Peter R. Kingsley-Smith, S.C. Department of Natural Resources

Project Number: R/CF-17

Triploid oysters have been shown to have higher rates of survival and growth and generate higher meat yields than diploids.  The most effective method of producing triploids requires access to proprietary tetraploid technology.  With the committed support of 4Cs Breeding Technology, Inc., the company that sub-licenses this technology to commercial hatcheries, the proposed work will provide valuable and previously unavailable data on the field performance of triploid Eastern oysters in South Carolina waters, thereby informing future investments in this technology.

The project objectives aim to (1) develop naturally mated diploid (2n VA ♂ x 2n SC ♀) and triploid (4n VA ♂ x 2n SC ♀) Eastern oysters at the Island Fresh Seafood, Inc. hatchery in South Carolina, (2)  investigate the comparative survival, growth and meat yields of diploid and triploid Eastern oysters deployed at field sites encompassing a range of estuarine areas, salinities and tidal regimes in South Carolina, (3) implement efficient spat removal by physical agitation (tumbling) to produce marketable single Eastern oysters and make valid comparisons of diploid and triploid survival and growth rates, and (4) apply the results of this study to an objective evaluation of the merits of developing tetraploid oyster technology in South Carolina at a commercially-viable scale.

Peter R. Kingsley-Smith

Title: Commercialization of Bait Shrimp (Litopenaeus setiferus)
Aquaculture through Year-Round Production in Indoor Facilities Using
Clear Water and Biotic-based Culture Systems

Principal Investigator:
  John Leffler, S.C. Department of Natural Resources

Project Number:

The efficacy of commercially produced shrimp for use as bait by fishermen in S.C. is currently unknown. One of the factors to establish this industry is to develop and optimize protocols that will enable year-round grow-out production of bait shrimp. The proposed work will experimentally answer questions of concern to potential growers and will disseminate information to those interested in developing the industry.

The goal of this project is to build on our experience with captive breeding of L. setiferus in order to advance commercialization of a viable bait shrimp industry in South Carolina and the Southeast.  Having demonstrated the operation of a L. setiferus hatchery, we will focus specifically on the next stage, i.e. the grow-out phase, by addressing two simple questions/hypotheses: First, can L. setiferus be grown economically from PL to marketable (6 g) size in indoor culture systems that are an appropriate size and design to simulate commercial grow-out conditions? Second, can information about protocols and market potential be effectively disseminated so that new bait shrimp farming enterprises start up in South Carolina by the end of this project?

John Leffler

Last updated: 2/13/2012 3:28:22 PM
Sustainable Fisheries and Aquaculture – ARCHIVED FY10-12


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