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The effect of casitas on Panulirus argus mortality, growth, and susceptibility to disease in The Bahamas

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The fishery for Panulirus argus (Latreille, 1804) in The Bahamas, which is the largest in the Wider Caribbean Sea, was historically trap-based, but casitas surpassed traps as the primary fishing gear in the 1990s. Casitas are artificial shelters that aggregate lobsters for ease of capture, but they are unregulated in The Bahamas and their effects on fishery sustainability are unknown. Concerns about whether overcrowding of lobsters within casitas detrimentally alters lobster growth, disease, or mortality prompted our study. Tethering and videography were used to compare lobster mortality and predation risk at casitas and in the natural environment, whereas nutritional condition, growth, injury, and prevalence of disease were compared for lobsters within casitas and traps. We found no difference in predation on subadult or adult lobsters in casitas compared to natural areas, although predators were more abundant near casitas. Lobsters in casitas had higher blood protein indices and fewer had shell disease than those in traps; the PaV1 virus was absent from lobsters we sampled. Starvation experiments in which lobsters were held in "ghost" traps during the closed season revealed a significant decline in lobster nutritional condition and an increase in shell disease after 3 wks, with nearly all lobsters afflicted after 6–12 wks. In summary, we found no evidence that casitas negatively affect subadult and adult P. argus in The Bahamas. Juvenile lobsters were rare in our study so potential effects of casitas on them were not investigated. Traps, however, pose a risk to the fishery if not properly managed.
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Document Type: Research Article

Affiliations: 1: Department of Marine Resources, Government of The Bahamas, P.O. Box EE-15028, Nassau, The Bahamas;, Email: [email protected] 2: Department of Biological Sciences, Department of Biological Sciences, Old Dominion University, Norfolk, Virginia 23529-0266

Publication date: 01 July 2018

This article was made available online on 23 May 2018 as a Fast Track article with title: "The effect of casitas on Panulirus argus mortality, growth, and susceptibility to disease in The Bahamas".

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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