Ecological characteristics and variations in numerical characters of masu salmon, Oncorhynchus masou populations in rivers of Japan sea coast of Hokkaido
1991
Mano, S. (Hokkaido Univ., Hakodate (Japan). Faculty of Fisheries) | Kanno, Y. | Kinoshita, T. | Maeda, T. | Kyushin, K.
Variations in numerical characters and population structure of Masu salmon populations were examined. Samples were collected from May to June, 1990 at seven rivers in Hokkaido, Japan. Seven numerical characters (vartebrae, upper gill rakers, lower gill rakers, dorsal fin rays, pectoral fin rays, pelvic fin rays and anal fin rays) were counted and analysed. One-year-old fish form 93% of all samples, and they were used for the following analysis. As a result of analysis of variance, significant differences in the means were observed in regards to five characters (vartebrae, lower gill rakers, dorsal fin rays, pectoral fin rays and anal fin rays) among seven populations. Mahalanobis's generalized distance was calculated using five significant characters and the distance shows a low value among near populations. The exception was the Kokamotsu River which showed singularity. According to the dendrogram based on Mahalanobis's generalized distance, the examined seven populations appeared to be divided into three groups, with the Kokamotsu River showing a high distinct isolate
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