Abstract
Stock assessment of the brown shrimp (Penaeus azteca) from the northwest Gulf of Mexico is developed using monthly data from commercial catches from 1974 to 1982. Growth parameters from the von Bertalanffy equation were as follows: Kmin = 0.142 m–1 to Kmax = 0.1812 m–1; L∞min = 214 mm to L∞max = 236 mm. Mortality rates were obtained directly from the identified cohorts through the catch curve and the weighted average of the amount of fishing applied on each cohort; results were as follows: total mortality, Zmin(1981) = 0.8494 to Zmax(1974) = 1.240; fishing mortality, Fmin( 1981) = 0.3786 to Fmax(1974) = 0.646; and natural mortality, Mmin(1978) = 0.415 to Mmax(1974) = 0.594. Catchability estimations mere: qmin(1975) = 0.0012 to qmax(1978) = 0.0021. Exploitation rate indicates a reduction of 30% of the fishing intensity, for the last two years, compared with the previous ones. From these years (1981 and 1982), fishery was acting under the maximum sustainable yield level.
Highlights
The brown shrimp, Penaeus aztecus, is one of the three species of shrimp with economic importance of the Gulf of Mexico, and represents nearly 95% of the catches of the Mexican vessels operating off the coasts of Tamaulipas and northem Veracruz
This study is focused on the stock assessment of brown shrimp Penaeus mtecus in the 1974-1982 period
The general tendency of the group was observed, obtaining a mean value for each age, which was later employed in the graphic of Ford-Walford to estimate the values of the parameters of the growth model of von Bertalanffy
Summary
The brown shrimp, Penaeus aztecus, is one of the three species of shrimp with economic importance of the Gulf of Mexico, and represents nearly 95% of the catches of the Mexican vessels operating off the coasts of Tamaulipas and northem Veracruz. Higher abundance of small shrimp is observed in the May-August catches, when 50% of the annual catch is extracted (Castro eI al., 1986). Even though this is one of the principal resources of the Gulf of Mexico, little is known about its state of exploitation. This study is focused on the stock assessment of brown shrimp Penaeus mtecus in the 1974-1982 period
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