Influence of maturity status on the annual cycles of feeding and growth in Arctic charr reared at constant temperature
Influence of maturity status on the annual cycles of feeding and growth in Arctic charr reared at constant temperature
复制标题
DOI：
10.1111/j.1095-8649.1996.tb01486.x
复制
发表时间：
1996-05
影响因子：
2
通讯作者：
H. Tveiten;H. Johnsen;M. Jobling
中科院分区：
文献类型：
--
作者：
H. Tveiten;H. Johnsen;M. Jobling
通过对个体标记鱼的摄食量和生长进行1年以上的监测，研究了未成熟（1 +）、成熟雄性（1 +）和成熟雄性和雌性（3+）北极红点鲑摄食和生长的时间变化。在自由饲料供应的条件下，将鱼保持在恒定温度（4°C）下。在12月至4月期间，摄食量和生长仍然很低，每次监测摄食量时，只有20-60%的鱼进食。在春末和夏季，摄食量和生长显着增加，但增加延迟约1-2个月，在未成熟的鱼相比，他们的成熟同行。成熟的鱼类在夏末减少了摄食，到9月几乎完全停止了摄食。这反映在鱼的体重和状况的变化上，这两者从8月至9月开始下降。相比之下，未成熟的鱼在9月的体重和条件达到峰值，在秋季的体重下降往往不如成熟的鱼观察到的那么快。一旦达到1-4-1-5的“阈值条件”，鱼似乎就会减少进食。这表明，鱼可能会成为越冬所需的能量储备补充后，在成熟的个体，完成性腺生长和产卵。
Temporal changes in feeding and growth of immature (1 +), maturing male (1 +), and mature male and female (3+) Arctic charr were studied by monitoring feed intake and growth of individually-marked fish for over 1 year. The fish were held at a constant temperature (4°C) under conditions of liberal feed supply. Feed intake and growth remained low in the period December-April, with only 20–60% of the fish having fed on each occasion that feed intake was monitored. Feed intake and growth increased markedly during the late spring and summer, but the increases were delayed by approximately 1–2 months in the immature fish compared with their maturing counterparts. Maturing fish decreased feeding during the late summer and by September there had been an almost complete cessation of feeding. This was reflected in changes in fish body weight and condition, both of which declined from August-September onwards. By contrast, the immature fish peaked in weight and condition in September, and weight loss during the autumn tended to be less rapid than observed for the maturing fish. The fish appeared to reduce feeding once a‘threshold condition’ of 1–4—1–5 had been attained. It is suggested that the fish may become anorexic once there has been replenishment of the energy reserves required for overwintering and, in the case of maturing individuals, for the completion of gonadal growth and Spawning.