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RESEARCH ARTICLE
Contents Vol 58(2)

Potential population and economic consequences of sublethal injuries in the spiny lobster fishery of the Florida Keys

D. M. Parsons A B C and D. B. Eggleston A
+ Author Affiliations
- Author Affiliations

A Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695-8208, USA.

B Present address: National Institute of Water and Atmospheric Research, P.O. Box 109-695, Newmarket, Auckland, New Zealand.

C Corresponding author. Email: darren.parsons@clear.net.nz

Marine and Freshwater Research 58(2) 166-177 https://doi.org/10.1071/MF06149
Submitted: 16 August 2006  Accepted: 7 December 2006   Published: 8 February 2007

Abstract

Animals that interact with but are not retained by fishing gears may later die. The population and economic consequences of these sublethal fishery interactions are seldom known but may be significant. In the present study, a population model was used to quantify potential population and economic consequences of injuries that Caribbean spiny lobsters (Panulirus argus) sustain from fishing activities in the Florida Keys, USA. Injuries generated by the fishery are known to reduce growth and elevate mortality. Simulation modelling results indicated that injuries may reduce adult lobster abundance and associated landings by ≥50% in areas with high recreational fishing effort. When simulated injuries were ~20 times lower (representing areas with lower fishing effort), these injuries were only responsible for a 5 and 8% reduction in the adult lobster population and commercial landings respectively. Important parameters within the model (growth, time in stage and mortality of injured lobsters) were altered by ±10% to assess model sensitivity. Final results changed <10% (with the exception of one 15% change), suggesting that model output was relatively insensitive to variation in key parameters. When the impact of sublethal injuries was applied to the entire spiny lobster fishery in the Florida Keys, adult stock biomass and annual commercial landings were reduced by 900 and 160 t (US$1.6 million) respectively. These results suggest that sublethal fishery interactions can lead to high population and economic losses, and highlight the need to incorporate sublethal injuries into stock assessments and economic models.

Additional keywords: Caribbean spiny lobster, Florida Keys, individual based model, Panulirus argus, recreational fishing, sublethal injury.


Acknowledgements

We thank M. Childress and B. Weeks for assistance with model programming and M. Butler, W. Herrnkind, J. Hunt, T. Matthews and B. Muller for providing data for model parameters. Statistical advice was given by G. Bell and N. Tolimieri and valuable comments on early drafts were provided by M. Childress, J. Hightower, T. Wolcott and two anonymous reviewers. Funding for this project was provided primarily by a Challenge Cost-Share Agreement between the Oceans Conservancy and USA Fish and Wildlife Service for contracts 1448-40181-99-6 and 1446-40181-00-6143, with supplemental funding from the National Fish and Wildlife Foundation (Contract 2004-0011-023), the fund for sustainable Fisheries at NC State University, NC State University International Student Office, and PADI Project AWARE.


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