Diferencias en el crecimiento de la sagittae de Prionotus nudigula Ginsburg, 1950 (Pisces: Triglidae) en relación al sexo

VOLEPDO ALEJANDRA; THOMPSON GUSTAVO

BOLETIN DEL INSTITUTO ESPANOL DE OCEANOGRAFIA

Instituto Español de Oceanografía

Lugar: Madrid; Año: 1998 vol. 12 p. 3 - 16

0074-0195

Sex-related growth differences in the sagiltae of Prionotus nudigula Ginsburg, 1950 (Pisces: Triglidae).The objective of the present paper is to study the morphology of the sagitta and calculate the morphometric parameters of the otolith in relationship to growth in length and weight of the fish. These parameters are necessary in age and growth studies of Prionotus nudigula Ginsburg, 1950.For each one of the 354 Prionotus nudigula specimens sex, total weight (P) and height (LT) were recorded, as well as maximum length (LO) and maximum width (A0) of the sagittae. The following relationships were analysed: P vs LT, LO vs LT AO vs LT; LO vs P and AO vs LO for female and males, as well as without discrimination between sexes. For the study of these relationships, the regression model with potential adjustment was used. The right and left sagittae of the same individual did not present meaningful differences; therefore, they are morphometrically and morphologically equal. The otoliths of males and female did not present differences in the topography of the internal and external sides, though is was observed that the sagittae of females are, longer than those of males. The analysis of relationships P vs LT and LO vs LT and P show that al the same length, females are heavier than males. The relationships LO vs LT and P and AO vs LO indicated a differential growth between sexes.