フィッシュポンプの利用に関する研究-V : 活魚移送とポンプの魚に与える影響

概要

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For efficiently operating a fish farm, the fish under care have to be sorted into size groups and transferred from pond to pond as often as possible. In this respect, experiments on utility of a 4-inch and an 8-inch pumps were carried out at a rainbow trout hatchery in November 1961. Procedures adopted to compare the operative efficiency were, as usually practiced in the sorting operation, to transfer living fish by means of dip net or to shed them down through a chute along with water pumped up from a pond. Thus, the efficiency was compared between the pumping operation and the other procedures in regard to the toll of dead fish, physical effects upon fish, and the time needed for each operation. The results are indicated in Tables 1 to 4 along with essential data pertinent to the experiments. It was tentatively concluded that a positive efficiency of using a pump over the ordinary procedures would well cover up the mortality of fish probably attributable to the pumping.
公益社団法人日本水産学会の論文