渓流区に放流したマス稚魚の生残に関する研究〔英文〕-2-

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概要

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• 1. Estimation of population size was made directly through observation with water-glass in an experimental area settled in a mountain brook. 2. The research period was divided into four periods owing to the occurrence of principles having influence on the errors of observation. 3. The flood was defined newly. 4. With use of errors of observation measured, a deviced procedure of correction of apparent survival or mortality rate was actually applied. 5. Some adjustment were applied tb apparent observed data including the population size of naturally propagated fingerlings of rainbow trout together with that of stocked rainbow trout fingerlings. 6. The change of behavioristic character made a cause to change the method of adjustment. Change of fishing method involved also made a cause to change the method of adjustment. (However, as the fishing method is subordinate to the change of behavioristic character of fingerlings, the actual principle should be taken to be the latter.) 7. Floods caused a large mortality showing the measures of 50.4 to 62% in rainbow trout fingerlings, and 67.9 to 83.7% in brook trout fingerlings at each flood. 8. Floods had scouring effect on mortality, and of decreased fingerlings 75.3 to 95.5% with rainbow trout and 99.0 to 100% with brook trout were estimated to be swept away from the experimental area, though some of them were expected to remain over some downstream area. 9. The intervals of measuring date in survivor survey before and after the occurrence of flood was thought to have some influence on the measure of scouring effect as well as on that of mortality caused by flood. In this case, the dispersion of fingerlings made on the days of usual flow was considered to be the actual agency to reduce the apparent impression of violence of flood, the action of which emerged in mortality of fingerlings and scouring effect.

• 社団法人 日本水産学会の論文

著者

• 小野寺 好之

  淡水区水産研究所

• 小野寺 好之

  Freshwater Fisheries Research Laboratory

• 上野 達治

  Freshwater Fisheries Research Laboratory

関連論文

• 綜合討論(生態)
• 綜合討論(生態)
• 放射性同位元素によるニジマスの天敵の迫跡
• 水産科学者と政治的立場
• On the survival of trout fingerlings stocked in a mountain brook-II. : Survival rate measured and scouring effect of flood as a cause of mortality.
• クリール・センサスにおける漁獲量の比推定について-1-
• Carrying capacity in a trout stream.
• クリール・センサスにおける漁獲量の比推定について-I : 漁獲量の補正係数
• 渓流区に放流したマス稚魚の生残に関する研究-I : 観察法による生残率の推定について
• 溪流区に放流したマス稚魚の生残に関する研究-1-
• 淡水魚の生長の変異性に関する二・三について (魚類の生長(昭和44年度日本水産学会秋季大会シンポジウム)) -- (自然における魚類の生長)
• 溪流区に放流したマス稚魚の生残に関する研究〔英文〕-2-
• 渓流区に放流したマス稚魚の生残に関する研究〔英文〕-2-
• 新しいクリール・センサスの方法による河川の漁獲量及び努力量の推定について〔英文〕
• 河川型の変化に応ずる漁獲努力量(アユ)の変化について

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