Food availability as a possible determinant for initiation and termination of reproductive activity in the tropical damselfish Chrysiptera cyanea
Food availability as a possible determinant for initiation and termination of reproductive activity in the tropical damselfish Chrysiptera cyanea
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DOI：
10.1080/17451000.2011.605146
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发表时间：
2012-01-01
影响因子：
1.1
通讯作者：
Takemura, Akihiro
中科院分区：
文献类型：
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作者：
Bapary, Mohammad Abu Jafor;Amin, Md. Nurul;Takemura, Akihiro
研究了食物可获得性和温度对热带小菜蛾繁殖成功的影响。在自然光照和温度条件下，用饱和饲料(SF，体质量的1.5-2.0%)和限量饲料(LF，SF的十分之一)饲养处于活跃繁殖状态的鱼类。食物投入量的减少影响了繁殖季节的产卵频率，只有在SF条件下才会重复产卵。随着卵黄生成卵母细胞从卵巢中消失，15天内条件因子(K)、肝体指数(HSI)和性腺体指数(GSI)显著降低。补充SF后，30d内仔鱼的K、HSI和GSI均升高，卵黄生成卵母细胞重新出现。当这两种摄食水平与20、25和30摄氏度的温度相交叉时，鱼在25摄氏度时保持了比20和30摄氏度下更好的卵巢条件，但在低频条件下则不然，这表明它们栖息地的最低和最高温度会影响鱼类的繁殖性能。结果表明，在适宜的光周期和温度条件范围内，食物的可获得性是热带季风环境中的一个区域性因素，对热带鱼的繁殖成功有影响。
The involvement of food availability and temperature in the reproductive success was examined in a tropical damselfish Chrysiptera cyanea. Fish undergoing active reproduction were reared with saturated feed (SF; 1.5-2.0% of body mass) and limited feed (LF; one-tenth of SF) under natural photoperiod and temperature. Reduction of food ration affected spawning frequency during the reproductive season and spawning occurred repeatedly only under SF condition. The LF resulted in significant decreases in condition factor (K), hepatosomatic index (HSI), and gonadosomatic index (GSI) within 15 days with disappearance of vitellogenic oocytes from the ovaries. When the LF-reared fish were re-fed with SF, their K, HSI and GSI increased and vitellogenic oocytes re-appeared within 30 days. When these two feeding levels were crossed with 20, 25 and 30 degrees C temperature regimes, the fish maintained better ovarian conditions at 25 degrees C than those at 20 and 30 degrees C, but not under LF conditions, suggesting that minimum and maximum temperatures in their habitat influence reproductive performance in fish. It is concluded that food availability is regarded as a regional factor in tropical monsoon environments and has an impact on reproductive success of tropical fish within suitable ranges in photoperiod and temperature conditions.