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cje ›› 1994, Vol. ›› Issue (3): 41-44.

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Effect of Pholoperiod on the Growth and Survival of Silver Carp, Bighead Carp and Common Carp fry

Wang Jiqiao1, Zhao Deshu2, Zhang Jingquan2   

  1. 1. Darlian Fisheries College, 116023;
    2. Biliuhe River Reservoir Fishery Farm of Dalian, 116428
  • Received:1992-07-10 Revised:1992-09-07 Online:1994-06-10

Abstract: The growth rates of tested fish fry increase, with increasing photoperiod. In ponds,the daily instantaneous growth rates of common carp, silver carp and bighead carp are 5.57,4.02 and 9.90 times higher under 14-15h sunlight than under 0h sunlight,respectively,and ih net chambers,they are respectively 0.6,3.7 and 3.3 times higher.The minimum and optimum photoperiod;for fry growth are 3-6 and 12h,respectively. It seems that common carp fry is more tolerant to short photoperiod than silver carp and bighead carp fry.There is no significant relationship between photoperiod and survival rate of fry.

Key words: cucumber, brassinolide, hypoxia stress, ultrastructure, photosynthetic characteristics.

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