Geographical variation in vertebral number of chum salmon fry on Hokkaido Island, Japan
2017
Ando, D. (Salmon and Freshwater Fisheries Research Institute, Hokkaido Research Organization, Eniwa, Hokkaido (Japan)) | Watanabe, T. | Shimoda, K.
Chum salmon eggs were collected from five local populations on Hokkaido Island during two different spawning periods, representing early and late spawning populations. Eggs from all populations and both spawning periods were maintained under similar laboratory conditions to detect variation in vertebral number of fry. Mean vertebral number varied according to both population and spawning period. Mean vertebral number observed in the late spawning population was lower than that of the early spawning population. Mean vertebral number was similar between salmon from neighboring rivers. These results suggest that the vertebral number of chum salmon varies between populations and is governed by hereditary factors.
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