5 research outputs found

    Management Implications of the Biodiversity and Socio-Economic Impacts of Shrimp Trawler By-Catch in Bahía de Kino, Sonora, México

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    The shrimp fishery is the most economically important fishery in Mexico. The trawler-based portion of this fishery results in high rates of by-catch. This study quantifies and describes the biodiversity of by-catch associated with trawling in the Bahía de Kino region of Sonora, Mexico. Data were collected from 55 trawls, on six boats, over 14 nights, during November of 2003, 2004, 2006–2009. By-catch rates within trawl samples averaged 85.9% measured by weight. A total of 183 by-catch species were identified during the course of this study, including 97 species of bony fish from 43 families, 19 species of elasmobranchs from 12 families, 66 species of invertebrates from eight phyla, and one species of marine turtle; seven of the documented by-catch species are listed on the IUCN Red List, CITES, or the Mexican NOM-059-ECOL-2010; 35 species documented in the by-catch are also targeted by local artisanal fishers. Some of the species frequently captured as juveniles in the by-catch are economically important to small-scale fishers in the region, and are particularly sensitive to overexploitation due to their life histories. This study highlights the need for further research quantifying the impacts of high levels of by-catch upon small-scale fishing economies in the region and presents strong ecological and economic rationale for by-catch management within the shrimp fishery of the Gulf of California. Site-specific by-catch management plans should be piloted in the Bahía de Kino region to address the growing momentum in national and international fisheries policy regimes toward the reduction of by-catch in shrimp fisheries

    By-catch species listed under Mexican endangered species legislation, the IUCN Red List, and/or CITES.

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    <p>By-catch species listed under Mexican endangered species legislation, the IUCN Red List, and/or CITES.</p

    Rate of by-catch by set, from 33 samples from eight nights in the Bahía de Kino region, during 2004–2009.

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    <p>There is a significant difference in the average by-catch rate when the time of the trawls are compared (F = 6.9, p<.01). The first trawl of each night (light blue bars) sampled had the highest rate of by-catch, while set 3 (yellow bars) had the lowest rate. The third trawl of the night began on average between 3am and 4am.</p

    Locations of 53 sampled trawls in the Bahía de Kino region, Sonora, Mexico, 2003–2009.

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    <p>Start locations of sampled trawls between 2003 and 2009. The sampled trawls occurred between 15.2 m and 39 m, typically along a sandy substrate.</p
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