Latin American Journal of Aquatic Research, 37 (1) March 2009
Período de desove y fecundidad del pez espada (Xiphias gladius) capturado en el Pacífico suroriental
This study presents the reproductive biology of the swordfish caught off the Chilean coast. Biological samples were taken in the economic exclusive zone and oceanic areas adjacent to Easter Island, Salas y Gómez Island, and San Félix and San Ambrosio islands between February 2001 and January 2002 and subjected to histological analysis. The monthly records of reproductively active females, the frequency of ovarian stages, and the gonadosomatic index show that spawning activity is greatest in austral summer, during January and February. An analysis of the oocyte frequency distributions revealed a separation of the most advanced mode around 600 μm if taking partial fecundity to be oocytes larger than 600 μm and if the fecundity varies between 0.5 and 31 million oocytes for females with 217 and 303 cm of lower jaw to fork length, respectively. The results indicate that the swordfish could be synchronous by group because, amongst their other characteristics, some specimens show a discontinuity between mature and immature oocytes.
Author: Gabriel Claramunt, Gustavo Herrera, Miguel Donoso & Enzo Acuña

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