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Year-class strength and growth rates after metamorphosis of Japanese sardine (Sardinops melanostictus) in the western North Pacific Ocean during 1996–2003

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Abstract:

Growth trajectories during larval to early juvenile stages in Japanese sardine (Sardinops melanostictus) were backcalculated based on the widths of otolith daily increments from 1996 to 2003 in the nursery grounds, Kuroshio–Oyashio transitional waters. Planktonic larvae hatched near Kuroshio have been transported northeastward from the Kuroshio waters to the transitional waters. We show that the somatic growth rates sharply increased after metamorphosis to the early juvenile stage, whereas previously, others showed that growth rate decreases during the larval stage. Otolith growth rates were more variable during the juvenile stage than the larval stage. Interannual variations in the otolith growth rate after metamorphosis explained more than 80% of variation in abundances of recruits (ca. 8–10months old) in the Pacific coastal waters, whereas no correlation was found between the growth rate during the early larval stage and abundance. Our result was consistent with the hypothesis of growth rate-dependent recruitment success in the Kuroshio–Oyashio transitional waters.

Nous avons déterminé par rétrocalcul les trajectoires de croissance depuis la larve jusqu’au début du stade juvénile chez la sardine japonaise (Sardinops melanostictus) d’après les largeurs des incréments journaliers des otolithes de 1996 à 2003 sur les nourriceries, les eaux de transition Kuroshio–Oyashio. Les larves planctoniques écloses près de Kuroshio sont transportées vers le nord-est, des eaux de Kuroshio vers les eaux de transition. Les taux de croissance somatique augmentent de façon nette après la métamorphose au premier stade juvénile; d’autres ont montré antérieurement une réduction du taux de croissance au cours du stade larvaire. Les taux de croissance des otolithes sont plus variables durant le stade juvénile que durant le stade larvaire. Les variations interannuelles du taux de croissance des otolithes après la métamorphose expliquent plus de 80 % de la variation d’abondance des recrues (âgées d’environ 8–10 mois) dans les eaux côtières du Pacifique, alors qu’il n’existe pas de corrélation entre le taux de croissance au début de la période larvaire et l’abondance. Nos résultats sont compatibles avec l’hypothèse qui veut que le succès du recrutement dans les eaux de transition de Kuroshio–Oyashio dépende du taux de croissance.

Document Type: Research Article

Publication date: July 1, 2008

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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