The Upper Gulf of California and Colorado River Delta is a zone which is immersed in an ecological, economic, political and social conflict. That is because of the Totoaba Totoaba macdonaldi illegal fishing and the Vaquita Phocoena sinus potential extinction. This issue has driven to ban all the region's fisheries with the exception of the Gulf corvina Cynoscion othonopterus which is the only of the finfish species with operating license. Therefore, the main objetive was to evaluate the fishery's health condition through the Froese sustainability indicators in Upper Gulf of California during 2008, 2013, 2014 and 2015 fishing seasons. The results showed that the Gulf corvina annual production ratio showed fluctuations, highlighting in the 2012-2016 period, when the whole fishing captures with the exception of 2014, surpassed the established quota by the
ABSTRACT. This study describes the growth parameters of males of the blue crab Callinectes arcuatus based on samples from a coastal lagoon in the southern Gulf of California and from individuals raised under controlled conditions. The models assessed were the four variants of the Schnute growth model and a special case of the von Bertalanffy model (VBGM). The Akaike information criterion was used to select the best model. The models with the best fit were Case 3 of the Schnute model for the separated wild and captive-reared data sets, but the combined data set fit better to the VBGM function, indicating linear growth, and Case 5 suggesting asymptotic growth of the C. arcuatus. Our results depend on the assumption that reared and fished individuals were covering the entire benthic growth period. It is concluded that 1) modeling growth by treating cohorts as individuals yields accurate estimations of k and the L∞ equivalent that can be used directly in stock assessment models, and (2) the ranges of validity of the best growth models for C. arcuatus growing in wild and cultured environments overlapped in the size range of 62 to 85 mm of carapace/width, but they have a continuity that represents blue crab growth throughout their benthic life. Keywords: Callinectes arcuatus, growth, multi-model, wild population, controlled conditions, Gulf of California. Estimación de los parámetros de crecimiento de los machos de la jaiba azulCallinectes arcuatus (Brachyura: Portunidae) del Golfo de California, utilizando el modelo de Schnute RESUMEN. Se describen los parámetros de crecimiento de machos de la jaiba azul Callinectes arcuatus, de una laguna costera del sureste del Golfo de California y de ejemplares mantenidos en condiciones controladas. Los modelos evaluados fueron las cuatro variantes de Schnute y el de von Bertalanffy (VBGM). El criterio utilizado para seleccionar el mejor modelo fue el de Akaike. Los modelos que presentaron un mejor ajuste fueron el Caso 3 de Schnute para datos separados, del medio natural o en condiciones controladas, indicando una relación lineal; y el Caso 5 de VBGM para los datos combinados, lo que sugiere un crecimiento asintótico para C. arcuatus. Estos resultados corresponden al análisis de los datos conjuntos de los organismos obtenidos del medio natural y de los estanques en condiciones controladas. Se concluye que 1) el modelo de crecimiento obtenido a través del análisis de las cohortes individuales presenta estimaciones adecuadas de k y L∞, que se puede considerar equivalente al utilizado en modelos evaluación de stocks, y 2) los rangos de validez de los mejores modelos de crecimiento para la jaiba azul C. arcuatus en el medio natural y en condiciones de cultivo coinciden en el rango de tamaño de 62 a 85 mm de ancho de cefalotórax, teniendo una continuidad que ajusta adecuadamente su crecimiento durante su etapa de vida bentónica.
In Mexico, shrimp catch is the main fishing activity, and the second important species is the blue shrimp, Penaeus stylirostris. Specimens of P. stylirostris collected in 2016-2018 from inland waters (bay) and offshore (littoral) in the Santa María la Reforma lagoon (SMLR) system were analysed. The sexes were separated, and then individuals were measured in total length (L, mm) and weighed (W, g). The data were transformed into a natural logarithm and were adjusted to seven candidate models with a multi-model approach (Linear, Quadratic, Cubic, Broken stick, Two segments, Three segments and Four segments: the last two proposed in this study as new equations). A total of 30 439 specimens were analysed. Statistical differences were found in L between areas (KS test, ). Positive and negative allometry was observed according to biometric relationship and sex. The best model was selected with the lowest value of the Akaike information criterion, resulting in the choice of the Four segments model.
En el sureste del golfo de California, en el estado de Sinaloa, la pesquería de las jaibas Callinectes arcuatus y C. bellicosus es la segunda más importante para los pescadores ribereños, después de la pesquería del camarón. Su captura se realiza durante casi todo el año, solo se suspende en los meses de su veda y al inicio de la temporada de pesca del camarón. La pesquería se realiza en diferentes zonas del estado y representa una gran fuente de ingreso en el sector de pesca ribereña, por ello la estimación de parámetros como la biomasa en el máximo rendimiento sostenible (BMRS) y el máximo rendimiento sostenible (MRS) son fundamentales para su manejo sustentable. En la presente investigación se utilizó la serie de captura oficial de 1993-2012 para 7 zonas de Sinaloa, México, con la finalidad de detectar posibles problemas de sobre-explotación del recurso. Los valores de tasa de incremento poblacional (r) calculados por el método de captura-MRS variaron entre 0,89 y 1,4, con una capacidad de carga (k) entre 390 y 14.814 t y un MRS de 131 a 3.302 t para las diversas zonas analizadas, mientras que en el análisis para todo el estado se estimó una r de 0,97, k de 32.550 t y un MRS de 7.895 t. En dos de las 7 zonas y en la evaluación global, la biomasa estimada se calculó por debajo de la BMRS, por lo que se recomienda la reducción de la captura por debajo del límite inferior calculado al 95%, con el objetivo de que el stock pueda regenerarse.
The spot prawn fishery, targeting Pandalus platyceros, has failed to prove commercially viable on the Mexican Pacific coast. A survey was carried out off the northwestern coast of Baja California, at depths of 140-180 m. The objective was to describe the biological traits of the species to test the hypothesis that warmer water stimulates higher growth parameters. An average model was estimated that anticipated an inverted exponential growth curve, consequently the growth parameters of the Von Bertalanffy model were obtained as , carapace length (CL) and . Being a protandric hermaphrodite, the transition size was estimated at 40.8 mm CL. The results challenged the hypothesis that P. platyceros grows faster in temperate environments than in cold environments.
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