The Depth and the Distance form Shore of the Routes of Migration of Salmons

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概要

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• The number of salmons which were found gilled on the leading branch of fixed nets installed at Voroskaya, West Kamtchatka, was analysed with respect to the distributions in the depth below the water surface, in the distance from sea-shore and in the direction. From the results (Table 1) the same factors of migration routes of the fish were inferred, taking into account the fact that the catch of each net varies parallelly with the number of fishes thus gilled (Fig. 1). With each of pink, dog and red salmons, it can be concluded that there are groups migrating northwards as well as those migrating southwards throughout the whole fishing season; that the proportion of groups migrating northwards becomes higher from the earlier (before Aug. 2) to the main fishing season (from Aug. 3 to Aug. 15) and then is decreased towards the end of the season (after Aug. 16); that the fishes are found exclusively near the surface in the earlier, more widely in depth in the main and more or less deep in the later fishing season; and that the fishes are abundant in the most distant part from the shore in the earlier, in the intermediate and the next parts to the shore in the main, and again most apart in the later season.

著者

• 菅野 進

  水産講習所

関連論文

• Immigration of Salmons to a Fishing Ground on the West Coast of Kamchatka in Relation to the Hydrographical Conditions
• The Model Experiments on Fixed Nets for Fishing Salmons in Kamchatka
• The Depth and the Distance form Shore of the Routes of Migration of Salmons
• The Shoreward Migration of Japanese King Crabs at a Fishing Ground in Western Kamtchatka

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