Differential isotopic enrichment and half-life among tissues in Japanese temperate bass (Lateolabrax japonicus) juveniles: implications for analyzing migration

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Abstract:

As a first step for field applications of stable isotope techniques to investigate the migration of Japanese temperate bass (Lateolabrax japonicus) (Perciformes) juveniles, we conducted a diet switch experiment and fitted an exponential model to changes in stable carbon (13C) and nitrogen (15N) isotope ratios for muscle, fin, and liver. The trophic enrichment values were ranked liver < muscle < fin for 13C (range –0.80‰ to +3.66‰) and liver < fin < muscle for 15N (+0.59‰ to +3.12‰). The half-life values were similar for muscle and fin for both 13C and 15N (19.3–25.7 days), while those for liver were 5.3 days for 13C and 14.4 days for 15N. Both the 13C and 15N values of muscle reached the asymptotic value after a threefold body weight increase, reflecting the diet after the switch. These results suggest that fin is a useful substitute for muscle in field applications of stable isotope techniques and that liver, with a shorter half-life, has the potential to provide more recent information about migration.

Comme première étape de l'application des techniques d'isotopes stables à l'étude sur le terrain de la migration des jeunes bars japonais (perciformes; Lateolabrax japonicus), nous avons fait une expérience de changement de régime alimentaire et ajusté un modèle exponentiel aux changements des rapports des isotopes stables de carbone (13C) et d'azote (15N) du muscle, de la nageoire et du foie. Les valeurs d'enrichissement trophique sont par ordre foie < muscle < nageoire pour 13C (étendue –0.80 ‰ à +3,66 ‰) et foie < nageoire < muscle pour 15N (+0,59 ‰ à +3,12 ‰). Les valeurs de demi-vie de 13C et 15N sont semblables dans le muscle et la nageoire (19,3–25,7 jours), alors que, dans le foie, elles sont de 5,3 jours pour 13C et de 14,4 jours pour 15N. Les valeurs de 13C et de 15N du muscle atteignent toutes deux une valeur d'asymptote, après une augmentation de masse corporelle par un facteur de trois, reflétant ainsi le régime alimentaire après le changement. Ces résultats indiquent que la nageoire peut être utilisée comme substitut du muscle dans les études de terrain qui emploient les techniques d'isotopes stables et que le foie, à cause de sa demi-vie plus courte, peut fournir des renseignements plus récents sur la migration.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: March 1, 2005

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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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