Principales aspectos biológicos reproductivos de Farfantepenaeus californiensis (Holmens,1900) en el mar ecuatoriano (Septiembre 2015-Agosto 2016)
Archivos
Fecha
2017
Autores
Título de la revista
ISSN de la revista
Título del volumen
Editor
Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
En el presente estudio se describe los principales aspectos reproductivos biológicos del camarón café Farfantepenaeus californiensis en el mar ecuatoriano, para lo cual se utilizó información proporcionada por el Instituto Nacional de Pesca (INP), que corresponde a faenas de pesca realizadas a partir de las 8 millas frente a las costas de Esmeraldas hasta Cojimies durante septiembre 2015 a agosto 2016. Los resultados mostraron diferencias significativas en la estructura de tallas de F. californiensis para sexos combinados (P< 0,05) siendo las hembras de mayor tamaño, así como también para la talla media de captura establecida en 12,0 cm Lt para machos y 14,0 cm Lt para hembras. Para definir los estadios gonadales se analizaron 4 354 hembras determinándose la mayor cantidad de individuos en estadio maduro en octubre 2015. Para la talla media de madurez sexual establecida en 16,9 cm Lt, se ajustó un modelo logístico, estimando los parámetros de la curva mediante el método de máxima verosimilitud. Para la proporción sexual se determinó una relación de 1:1,3 macho/hembra, para la cual la prueba de X2 determinó que no existió diferencias significativas de manera mensual. Desde un punto de vista biológico, octubre se presentó como un mes importante, debido al registró del mayor porcentaje de hembras en estadios maduros, máximo valor de proporción sexual, mayor número de individuos sobre la talla media de madurez sexual y un amplio rango de tallas, comportamiento que estaría influenciado por las condiciones oceanográficas registradas en 2015, especialmente por los valores de temperatura registrados en el mes antes mencionado. En el aspecto pesquero considerando el alto porcentaje de individuos bajo la talla media de madurez sexual se considera que la pesquería estaría actuando principalmente sobre individuos juveniles como resultado de las características del arte de pesca, específicamente en relación al ojo de malla empleado.
The present study describes the main biological reproductive aspects of the brown shrimp Farfantepenaeus californiensis in the Ecuadorian Sea, in which information provided by the National Fisheries Institute (INP) was used, these corresponds to fishing operations carried out after 8 miles offshore from Esmeraldas to Cojimies during September 2015 to August 2016. The results showed significant differences in the size structure of F. californiensis for the combined sexes (P< 0.05) being the females larger, as well as for the catch size established in 12,0 cm Lt for males and 14,0 cm Lt for females. To define the gonadal stages, 4 354 females were analyzed, determining the highest number of mature individuals in October 2015. To establish the average size of sexual maturity in 16,9 cm Lt, an logistic model was set, estimating the parameters of the curve using the method of maximum likelihood. As for the sex ratio, a ratio of 1:1,3 male/female was determined, in which the X2 test determined that there were no significant differences on a monthly basis. From a biological point of view, October was presented as an important month, due to the highest percentage of females in mature stages, the highest value of sexual proportion, the highest number of individuals on the average size of sexual maturity and a wide range of sizes, behavior that would be influenced by the oceanographic conditions recorded in 2015, especially by the temperature values recorded in the aforementioned month. In the fishing aspect, considering the high percentage of individuals under the average size of sexual maturity, it is considered that the fishery would be acting mainly on juvenile individuals as a result of the characteristics of the fishing arts, specifically in relation to the used mesh eye.
The present study describes the main biological reproductive aspects of the brown shrimp Farfantepenaeus californiensis in the Ecuadorian Sea, in which information provided by the National Fisheries Institute (INP) was used, these corresponds to fishing operations carried out after 8 miles offshore from Esmeraldas to Cojimies during September 2015 to August 2016. The results showed significant differences in the size structure of F. californiensis for the combined sexes (P< 0.05) being the females larger, as well as for the catch size established in 12,0 cm Lt for males and 14,0 cm Lt for females. To define the gonadal stages, 4 354 females were analyzed, determining the highest number of mature individuals in October 2015. To establish the average size of sexual maturity in 16,9 cm Lt, an logistic model was set, estimating the parameters of the curve using the method of maximum likelihood. As for the sex ratio, a ratio of 1:1,3 male/female was determined, in which the X2 test determined that there were no significant differences on a monthly basis. From a biological point of view, October was presented as an important month, due to the highest percentage of females in mature stages, the highest value of sexual proportion, the highest number of individuals on the average size of sexual maturity and a wide range of sizes, behavior that would be influenced by the oceanographic conditions recorded in 2015, especially by the temperature values recorded in the aforementioned month. In the fishing aspect, considering the high percentage of individuals under the average size of sexual maturity, it is considered that the fishery would be acting mainly on juvenile individuals as a result of the characteristics of the fishing arts, specifically in relation to the used mesh eye.
Descripción
Palabras clave
FARFANTEPENAEUS CALIFORNIENSIS, PESCA EXPERIMENTAL, TALLA DE PRIMERA MADUREZ, ZONA COSTERA