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Juvenile bimodal length distribution and sea-run migration of the lower modal group in the Pacific Ocean form of three-spined stickleback

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Juvenile three-spined stickleback Gasterosteus aculeatus in their nursery pond had a bimodal length distribution after October in their first year of life. A sea-run migration of all individuals belonging to the lower modal group was observed, with a peak in early November. These data suggest that partial migration based on the early status of individual juveniles occurs in the Pacific Ocean form of three-spined stickleback.

Keywords: Gasterosteus aculeatus; anadromous; conditional strategy; partial migration; river resident

Document Type: Research Article


Affiliations: 1: Laboratory of Breeding Science, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate 041-8611, Japan 2: Ono Limnological Laboratory, Department of Applied Aquabiology, National Fisheries University, 8319-2 Ono, Ube, Yamaguchi 754-1311, Japan

Publication date: October 1, 2006


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