Management for the White Shrimp (Litopenaeus vannamei) from the Southeastern Gulf of California through Biomass Models Analysis

Juan Madrid-Vera,Ricardo Meraz-Sánchez,Juan Melchor Aragón,Darío Chávez Herrera,José Alberto Rodríguez-Preciado

doi:10.4236/ojms.2012.21002

Juan Madrid-Vera, Ricardo Meraz-Sánchez + Show 3 more

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https://doi.org/10.4236/ojms.2012.21002

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Abstract

Samples taken during the closed fishing seasons from 1992 to 2010 were analyzed at sea. These data along with the landing records for the fishing periods from 1992-1993 to 2009-2010 were used to allow the situation of Litopenaeus van-namei from the coasts of Sinaloa and Nayarit to be analyzed by means of stochastic models and by a graphic approach for the surplus biomass. Using the catch from 1993-1994 as a reference point and comparing this to the 2008-2009 catch revealed a stock decrease of about 65%. By taking into account the percentage contribution to total shrimp land-ings, these changes showed a decrease from 76% to 12%. There were changes between 2000 and 2001 when the fleet grew by 50%. Considering a 3600 t maximum sustained yield (MSY) in the series 1992-2010, 50% of the reports are lower. It is necessary to recover the stock.

Highlights

We believe that updating of the present information and having a discussion about the Pacific white shrimp population, with the goal of revitalizing the protection and the future of the stock, is important
From studies of the structure and population dynamics of the white shrimp in the continental area of the southern Gulf of California, the highest recruitment and greatest growth rates for penaidae shrimp was from June to July in the estuarine system Huizache and Caimanero at the mouth of the Gulf of California [1,2]
By analyzing the annual variation for the brown shrimp (Farfantepenaeus californiensis) and white shrimp (Litopenaeus vannamei) in the Gulf of the Tehuantepec, the results indicated that the closed seasons protected almost 100% of the white shrimp recruits and 90% of the brown shrimp recruits

Summary

Introduction

We believe that updating of the present information and having a discussion about the Pacific white shrimp population, with the goal of revitalizing the protection and the future of the stock, is important. We may do this by generating a diverse heuristic approach on the present health of the population, its exploitation, and catch levels through biomass models and the associated graphic analysis. From data for the mouth of Rio Baluarte, recorded that the highest abundance of postlarvae were from June to September for L. vannamei [5]. From data of L. vannamei of the Rio Presidio, at the mouth of the Cali-

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