西南部日本に分布する河川,湖沼型サケ科魚類ヘモグロビンの澱粉ゲル電気泳動的研究-2-サケ属魚類〔英文〕
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概要
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Hemoglobins of mainly native species of genus Oncorhynchus fishes distributed in various rivers and a lake in the southwestern part of Japan were analyzed by starch-gel electrophoresis. Results obtained are as follows. 1) The "amago" specimens which were caught in the isolated areas gave an almost uniform pattern with little individual differences. So were the cases with "yamame" and "biwamasu". The patterns of both fishes in addition, were indistinguishable from each other. On the other hand, the specimens living in the areas where the hybridization among those fishes seems possible due to the geographical reason or due to the stocking with some of those fishes, showed wide individual differences in Hb pattern. 2) Their Hb patterns inculding that of "nijimasu", were practically the same in respect of six components near the origin, Hb a, Hb b, Hb c, Hb d, Hb e and Hb f. However, Hb g, Hb h, and Hb i, all of which migrated faster to the anode than Hb's a-f, were almost common to the Oncorhynchus fishes, but not to "nijimasu". As for Hb's j-1, Hb 1 was observed in "amago" and "iwame", but not at all in "yamame" and "biwamasu". Furthermore, the relative proportions of Hb j and Hb k in "yamame" and "biwamasu" were clearly less, compared to those in "amago" and "nijimasu". 3) In some specimens of "amago", Hb components regarded as "abnormal" were detected. In such cases another "abnormal" Hb component appeared additionally in one and the same specimen: e.g., in a pair of Hb z' and Hb b _??_, or Hb z and Hb b". 4) The present results agree with the theory that "biwamasu" is not the lacustrine form of "amago", the theory chiefly based on the morphological observations such as the aspect of scales. Considering not only the feature of Hb pattern but the ecological observations, "biwamasu" could be the offspring of the original species of "amago" that made a peculiar evolution in Lake Biwa. In this connection, it may be suggested that "biwamasu" and "amago" be treated as two different subspecies.
- 日本水産學會の論文