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Stable isotopic composition of otoliths in identification of spawning stocks of Pacific herring (Clupea pallasi) in Puget Sound

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Abstract:

Otoliths of Pacific herring (Clupea pallasi) were collected from Puget Sound, Washington, and were analysed for oxygen and carbon isotope ratios (18O and 13C). It was expected that if adult herring spawn at different localities with different 18O and 13C values, these isotope variations would constitute a natural tag that can be used to distinguish the herring spawning stocks. For a test project, we took aragonite powder samples from the surface of otolith nuclei and the second summer otolith rings, respectively. Isotopic composition of otolith nuclei from the Georgia Strait had lowest isotope values (from –8.2‰ to –2.0‰ VPDB (Vienna Peedee belemnite) in 18O and –6.8‰ to –3.9‰ VPDB in 13C), significantly different from those collected from two southern Puget Sound spawning grounds (from –3.9‰ to –0.9‰ VPDB in 18O and –5.6‰ to –2.0‰ VPDB in 13C). This isotopic identification is consistent with the biological observation and the actual sample collection. Stable isotopic information extracted from the summer otolith rings, in contrast, showed two types of herring in 1999 corresponding to the migratory and non-migratory stocks in Puget Sound. The rate of the two types of herring was about 70% versus 30%.

Une analyse a permis de déterminer les rapports isotopiques d'oxygène et de carbone (18O et 13C) des otolithes de Harengs du Pacifique (Clupea pallasi) récoltés dans Puget Sound au Washington. On s'attendait à ce que si les harengs frayent dans des localités différentes dont les valeurs de 18O et de 13C sont distinctes, ces variations isotopiques pourraient servir de marqueurs naturels pour distinguer les divers stocks reproducteurs de harengs. Pour vérifier cette hypothèse, nous avons prélevé des échantillons de poudre d'aragonite sur la surface des noyaux des otolithes ainsi que dans les anneaux de croissance correspondant au second été. La composition isotopique des noyaux des otoli thes du détroit de Géorgie avait les valeurs les plus basses (de –8,2 ‰ à –2,0 ‰ VPDB (« Vienna Peedee belemnite ») pour 18O et de –6,8 ‰ à –3,9 ‰ pour 13C) qui diffèrent significativement de celles mesurées dans les échantillons provenant des frayères du sud de Puget Sound (de –3,9 ‰ à –0,9 ‰ VPDB pour 18O et de –5,6 ‰ à –2,0 ‰ pour 13C). Cette identification isotopique est en accord avec l'observation biologique et la récolte des échantillons. Les renseignements sur les isotopes stables obtenus à partir des anneaux de croissance d'été permettent de distinguer deux types de harengs en 1999 qui correspondent aux stocks migrateur et non-migrateur de Puget Sound. Les proportions de ces deux types de harengs sont respectivement d'environ 70% et 30%.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2001-11-01

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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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