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vol.37 issue1Ecomorphological considerations of the prey capture mechanism of Xiphias gladius (Linnaeus, 1758)Identification of the spatial-temporal distribution pattern of swordfish (Xiphias gladius) in the southeastern Pacific author indexsubject indexarticles search
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Latin american journal of aquatic research

On-line version ISSN 0718-560X

Abstract

CLARAMUNT, Gabriel; HERRERA, Gustavo; DONOSO, Miguel  and  ACUNA, Enzo. Spawning period and fecundity of swordfish (Xiphias gladius) caught in the southeastern Pacific. Lat. Am. J. Aquat. Res. [online]. 2009, vol.37, n.1, pp.29-41. ISSN 0718-560X.

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 áreas 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 varíes 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.

Keywords : gonadal maturity; gonadosomatic index; histology; fecundity; swordfish; southeastern Pacific.

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