|
|||||
|
|
Juvenile bimodal length distribution and sea-run migration of the lower modal group in the Pacific Ocean form of three-spined stickleback |
|
| Authors: | T Kitamura † M Kume H Takahashi ‡ A Goto |
| Institution: | Laboratory of Breeding Science, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate 041-8611, Japan; and Ono Limnological Laboratory, Department of Applied Aquabiology, National Fisheries University, 8319-2 Ono, Ube, Yamaguchi 754-1311, Japan |
| Abstract: | 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: | anadromous conditional strategy Gasterosteus aculeatus partial migration river resident |