The effect of water level lowering in Miharu Dam Reservoir on the reproduction of largemouth bass, Micropterus salmoides

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  • さくら湖（三春ダム）の水位低下がオオクチバスの繁殖に与える影響
  • サクラコ ミハル ダム ノ スイイ テイカ ガ オオクチバス ノ ハンショク ニ アタエル エイキョウ

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Abstract

The effect of water level lowering for flood control on the reproduction of largemouth bass, Micropterus salmoides, was studied in Miharu Dam Reservoir, Fukushima Japan. The capture investigation was continued from the year of the first filling of water in the dam. The results indicated that largemouth bass increased immediately after invasion, especially in the Pre-Reservoir where water level was fixed. The increased largemouth bass then decreased in the next year, however the tendency in which fishes eaten by largemouth bass decreased was continued. Maturating and hatching season of largemouth bass was surveyed in the Pre-Reservoirs. The hatching date was analyzed by the number of otolith rings, and maturity of gonads were determined by histological analyses. These analyses suggested that their spawning season was from early May to late June when water temperature rose from 15°C to 21°C. Analyses of otolith rings of juveniles indicated that hatching did not occur during the water level lowering period. Furthermore, it was observed that juveniles were dead at the edge of the water during the period. These results suggested that the water level lowering over 2.5m and at the speed over 0.27m/day, water temperature risen from 15°C to 21°C, suppressed the reproduction of largemouth bass.

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