日本水産学会誌
Online ISSN : 1349-998X
Print ISSN : 0021-5392
ニジマスの釣られ易さの個体差と釣り針回避学習に及ぼす無給餌期間の影響
米山 兼二郎松岡 達郎川村 軍蔵
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キーワード: 釣獲, 個体差, 学習, ニジマス, 給餌
ジャーナル フリー

62 巻 (1996) 2 号 p. 236-242

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The effect of starvation on the individual catchability and hook-avoidance learning of the rainbow trout Oncorhynchus mykiss, was determined in angling experiments in outdoor tanks. The fish used were 215mm in mean total length and were obtained from local fish farmers and grouped into two (K and Y) separate experimental tanks. Before the angling experiments, the K group was starved for 3 days, and the Y group for 10 days. Three subgroups from the K group and five subgroups from Y group were subjected to the capture-recapture method to test the individual catchability and hook-avoidance learning. Probability analysis of the results indicated that the K group showed differences in individual catchability but did not learn to avoid hooks, whereas the Y group showed the reverse. Another subgroup from the Y group was subjected to a test with the capturerecruit method, in which angled fish were replaced with naive ones, however these still showed no difference in individual catchability. Therefore, a period of starvation does affect the individual catchability and hook-avoidance learning of rainbow trout, but the mechanism underlying this has yet to be determined.

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