Changes in Pacific hake (Merluccius productus) migration patterns and juvenile growth related to the 1989 regime shift

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The response of Pacific hake (Merluccius productus) to recent changes in ocean conditions has been dramatic, with a larger proportion of the stock moving into Canadian waters in the 1990s. Additionally, after 1994, hake spawned in Canadian waters and a portion of the stock remained year round. The change in distribution corresponded with a change in growth of juvenile hake. These changes were examined in relation to upwelling and temperature. We also examined these changes in relation to changes in the abundance of euphausiids, which are the primary food supply. We propose that the 1989 regime shift differentially affected the availability of euphausiids in the northern and southern Coastal Upwelling Domain, with feeding conditions in the north improved relative to those in the south. This promoted faster growth of juveniles in the northern regions during the 1990s.

La réaction du merlu du Pacifique (Merluccius productus) aux changements récents des conditions océaniques a été spectaculaire et une proportion accrue du stock est entrée dans les eaux canadiennes au cours des années 1990. De plus, après 1994, le merlu a frayé dans les eaux canadiennes et une portion du stock y est demeuré toute l'année. Ce changement de répartition a été accompagné d'un changement dans la croissance des jeunes merlus. Ces modifications ont été examinées en relation avec les résurgences d'eau profonde et la température, ainsi qu'avec les variations dans l'abondance des euphausiides qui constituent la source principale de nourriture. Nous suggérons que le changement de régime en 1989 a affecté de façon différente la disponibilité des euphausiides dans les parties nord et sud du domaine de résurgence côtière et que les conditions alimentaires se sont améliorées dans le nord par comparaison au sud, ce qui a entraîné une croissance plus rapide dans les régions du nord au cours des années 1990.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2002

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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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