摘要
研究了温度对奥尼罗非鱼（Oreochromis niloticus×O．aureus）受精卯孵化和仔鱼活力的影响。在盐度为5不同温度（22、24、26、28、30、32和34℃）下，比较观察奥尼罗非鱼受精卵的培育周期、孵化周期、孵化率和畸形率。同时在以上不同温度条件下对初孵的奥尼罗非鱼仔鱼进行耐饥饿试验，测定其不投饵存活系数（Survival activity index，SAI）。结果表明：在温度为24～32℃，受精卵孵化率较高（84．3％-91％），温度高于34℃和低于22℃时，孵化率较低。温度与培育周期呈负相关关系，函数关系为Y=0．3607x^2-26．836x＋553．5，R^2=0．973。仔鱼生存适宜温度是24～30℃，最适的温度是24—26℃。温度为22℃时，SAI值分别为19．9，但是仔鱼发育的缓慢，部分仔鱼的身体色素一直没有出现，不适合仔鱼的培育。
Effect of temperature on hatching of fertilized eggs and larval activity of hybrid tilapia was investigated in the present study. When the salinity was 5, the incubation and hatching period, hatching and deformity rates of fertilized eggs and survival activity index （SAI） of newly hatched larvae of hybrid tilapia were observed and measured at the temperature of 22, 24, 26, 28, 30, 32 and 34 ℃ The results showed that the fertilized eggs developed well and had a high hatching rate（84. 3% - 91% ） at the temperature of 24 - 32 ℃. The fertilized eggs had a low hatching rate when temperature was below 22 ℃ or above than 34 ℃. Temperature was negative related to hatching period. Functional relation： y = 0. 3607x^2 - 26. 836x ＋ 553.5, R^2 = 0. 973. The temperature for the survival of larval hybrid tilapias was 24 - 30 ℃, and the optimum temperature appropriate was 24 - 26 ℃. When temperature was 22 ℃, SAI values was19.9, while larvae developed slowly and the body pigment did not appeare, this temperature was not suitable for the survival of larvae.
出处
《淡水渔业》
CSCD
北大核心
2008年第4期25-29,共5页
Freshwater Fisheries
基金
广东省科技计划项目(No.2006B202230017)
