Journal Article

Genetic impacts of shrimp trawling on red snapper (<i>Lutjanus campechanus</i>) in the northern Gulf of Mexico

Eric Saillant, S. Coleen Bradfield and John R. Gold

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 63, issue 4, pages 705-713
Published in print January 2006 | ISSN: 1054-3139
Published online January 2006 | e-ISSN: 1095-9289 | DOI:
Genetic impacts of shrimp trawling on red snapper (Lutjanus campechanus) in the northern Gulf of Mexico

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  • Marine and Estuarine Biology


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Genetic variation and genetic relatedness are investigated among age-0 red snapper (Lutjanus campechanus) sampled as bycatch in shrimp trawls from five localities in the northern Gulf of Mexico. Reference samples from the same geographic areas were obtained by sampling a few juveniles at a time during multiple trawl tows. No significant differences in allelic richness, gene diversity, or allele (or genotype) distributions at 16 nuclear-encoded microsatellites were found between the five bycatch samples and reference samples taken from the same geographic area. These results indicate that red snappers taken as bycatch neither have reduced genetic variation relative to the local population nor do they appear to represent a non-random sample from the local population in terms of allele or genotype distributions. Estimates of the within-sample variance of pairwise relatedness did not differ significantly from zero for any bycatch or reference sample. Hence, red snapper in the bycatch samples are not more closely related genetically to one another than would be expected when sampling individuals at random from the local population. These results indicate that there are no direct, detectable genetic impacts of shrimp trawling on red snapper at the localities sampled.

Keywords: genetic impacts; red snapper; shrimp bycatch

Journal Article.  5519 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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