Características morfométricas de los otolitos de Ophychthus remiger proveniente de la pesquería en la costa ecuatoriana.
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2018
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Facultad de Ciencias Naturales, Universidad de Guayaquil
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La anguila común (Ophichthus remiger) es una especie con valor comercial de la cual son limitados los conocimientos sobre sus aspectos biológico-pesqueros, entre ellos las relaciones biométricas; por lo tanto, el objetivo de este trabajo fue determinar las características morfométricas de los otolitos y su relación con la talla, así como, el peso de la anguila común, en Ecuador. Se analizaron datos de tallas de esa especie recolectados por el Instituto Nacional de pesca en los puertos de desembarque de Manta, Anconcito y Posorja, así como, 241 pares de otolitos extraídos en muestras de tales sitios. Las dimensiones (largo y ancho) y el peso de otolito fueron comparadas entre el lado izquierdo y derecho de cada sexo y entre ellos, mediante análisis de varianza de un factor (ANOVA) y multivariado (MANOVA). Se realizaron regresiones lineales entre las dimensiones y pesos del otolito respecto con la longitud total del organismo. No se encontraron diferencias significativas entre los otolitos izquierdo y derecho en cada sexo (p > 0.05), pero sí entre ellos (p < 0.01). La anguila común presentó un crecimiento isométrico entre la longitud y ancho del otolito respecto con la talla del organismo mientras que, con el peso la alometría fue negativa; adicionalmente, en esta última relación se encontraron dos agrupaciones de datos. Los otolitos son similares en ambos lados en cada sexo, aquello indica la validez de la elección de uno u otro en análisis de retro-cálculo por esto las diferencias encontradas en las dimensiones de otolito pueden deberse a condiciones genéticas o ambientales. Los dos grupos de datos encontrados en la relación del peso del otolito con la talla del organismo pueden interpretarse como individuos diferenciados por el grado de desarrollo gonadal.
The common eel (Ophichthus remiger) is a species with commercial value of which the knowledge on its biological-fishing aspects is limited, among them the biometric relations; therefore, the objective of this work was to determine the morphometric characteristics of the otoliths and their relationship with the size, as well as the weight of the common eel, in Ecuador. Size data of this species collected by the Instituto Nacional de Pesca were analyzed at the landing ports of Manta, Anconcito and Posorja, as well as 241 pairs of otoliths extracted from samples from such sites. The dimensions (length and width) and the weight of otolith were compared between the left and right sides of each sex and between them, by means of analysis of variance of a factor (ANOVA) and multivariate (MANOVA). Linear regressions were performed between the dimensions and weights of the otolith with respect to the total length of the organism. No significant differences were found between left and right otoliths in each sex (p> 0.05), but among them (p <0.01). The common eel presented an isometric growth between the length and width of the otolith with respect to the size of the organism while, with the weight the allometry was negative; additionally, in this last relation two data groupings were found. The otoliths are similar on both sides in each sex that indicates the validity of the choice of one or the other in retrocalculus analysis. The differences found in the otolith dimensions may be due to genetic or environmental conditions. The two groups of data found in the relationship between otolith weight and body size can be interpreted as individuals differentiated by the degree of gonadal development.
The common eel (Ophichthus remiger) is a species with commercial value of which the knowledge on its biological-fishing aspects is limited, among them the biometric relations; therefore, the objective of this work was to determine the morphometric characteristics of the otoliths and their relationship with the size, as well as the weight of the common eel, in Ecuador. Size data of this species collected by the Instituto Nacional de Pesca were analyzed at the landing ports of Manta, Anconcito and Posorja, as well as 241 pairs of otoliths extracted from samples from such sites. The dimensions (length and width) and the weight of otolith were compared between the left and right sides of each sex and between them, by means of analysis of variance of a factor (ANOVA) and multivariate (MANOVA). Linear regressions were performed between the dimensions and weights of the otolith with respect to the total length of the organism. No significant differences were found between left and right otoliths in each sex (p> 0.05), but among them (p <0.01). The common eel presented an isometric growth between the length and width of the otolith with respect to the size of the organism while, with the weight the allometry was negative; additionally, in this last relation two data groupings were found. The otoliths are similar on both sides in each sex that indicates the validity of the choice of one or the other in retrocalculus analysis. The differences found in the otolith dimensions may be due to genetic or environmental conditions. The two groups of data found in the relationship between otolith weight and body size can be interpreted as individuals differentiated by the degree of gonadal development.
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RELACIONES BIOMÉTRICAS, ANGUILA COMÚN, ALOMETRÍA, RETRO-CÁLCULO