SciELO - Scientific Electronic Library Online

 
vol.41 issue3The use of lactic acid bacteria isolated from intestinal tract of Nile tilapia (Oreochromis niloticus), as growth promoters in fish fed low protein dietsZoning of the Mejillones Peninsula marine protected coastal area of multiple uses, northern Chile author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Latin american journal of aquatic research

On-line version ISSN 0718-560X

Abstract

RUELAS-PENA, Joaquín Humberto; VALDEZ-MUNOZ, Carmen  and  ARAGON-NORIEGA, Eugenio Alberto. Analysis of the corvina gulf fishery as a function of management actions in the Upper Gulf of California, Mexico. Lat. Am. J. Aquat. Res. [online]. 2013, vol.41, n.3, pp.498-505. ISSN 0718-560X.  http://dx.doi.org/103856/vol41-issue3-fulltext-13.

The gulf corvina (Cynoscion othonopterus), is an endemic species of the Gulf of California, and its fishery is one of the most important in the Upper Gulf of California. Two dynamic biomass models (Schaefer & Pella-Tomlinson), were used to assess the state of the stock due to the lack of enough age data for a reliable full age-structured stock assessment. The models required an historical annual time-series of the abundance index (from 1993 to 2010), derived from the commercial catch and effort data. The Akaike information criterion indicates that the best model was the Schaefer model. The maximum sustainable yield (MSY), estimated with the Schaefer model was 3.100 ton, with a maximum surplus biomass (BMSY) that will allow the capture of 8.200 ton, and a fishing effort (fMSY) of 457 boats. The fishing mortality (F = 0.43) was 26% higher than the fishing mortality at the biological reference point (F0.1 = 0.34). The average biomass from 2006 to 2010 was 52% of the optimum level of the fishery (Est2006-2010 < 1). In 1999 an increase of the fishing effort accelerated the decrease of the biomass. These results indicate that the stock has not been healthy, in spite of the Biosphere Reserve decree, because the core zone has not been respected as a prohibited zone for fishing, and because of the increased fishing effort.

Keywords : gulf corvina; Cynoscion othonopterus; fishery; Upper Gulf of California; biosphere reserve; México.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License