Hatching time of “Honmoroko” <I>Gnathopogon caerulescens</I> eggs under constant versus fluctuating temperature regimes

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  • 一定水温および変動水温下におけるホンモロコ卵の孵化時間
  • イッテイ スイオン オヨビ ヘンドウ スイオン カ ニ オケル ホンモロコラン ノ フカ ジカン

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Description

The hatching time of eggs of “honmoroko” (Gnathopogon caerulescens), a small cyprinid fish endemic to Lake Biwa, was investigated under different rearing regimes of either constant temperature or fluctuating temperature representative of coastal water in Lake Biwa through the spawning season. Under constant temperature, eggs could hatch normally in the range of 10-29°C. Under fluctuating temperatures, spawning and hatching of eggs occurred in the range of 10-27°C and hatching rates of all batches of eggs were high. The hatching time was shorter at the fluctuating temperature than that of the same constant temperature. These results indicate that the lower temperature limit for hatching is 6-10°C, the upper temperature limit is 29-32°C, and the optimum temperature range is 10-29°C, coinciding nearly with the range of successful spawning and hatching under fluctuating temperature condition. Hatching time was more than 16 days in April and 7 days in June, and the water level of the lake should be maintained in order to protect the eggs laid at the lakeshore.

Journal

  • Aquaculture Science

    Aquaculture Science 64 (1), 97-102, 2016

    Japanese Society for Aquaculture Science

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