• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquaculture Research >Interactions between temperature and size on the growth, size heterogeneity, mortality and cannibalism in cultured larvae and juveniles of the Asian catfish, Pangasianodon hypophthalmus (Sauvage)
【24h】

Interactions between temperature and size on the growth, size heterogeneity, mortality and cannibalism in cultured larvae and juveniles of the Asian catfish, Pangasianodon hypophthalmus (Sauvage)

机译：温度和大小之间的相互作用对亚洲cat鱼Panggasianodon hypophthalmus（Sauvage）的幼体和幼体的生长，大小异质性，死亡率和食人性的相互作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Temperature effects vary throughout the ontogeny, but are proportionally more variable during the early life stages than in older fish. The larvae of a few species have been studied but contrasting trajectories were observed, thereby making it difficult to predict how temperature impacts on the growth, survival and size heterogeneity in a particular species. This study examined these interactions in young [0.9?mg–1?g wet mass (WM)] Pangasianodon hypophthalmus, one of the most extensively cultured tropical fish. Fish were raised at five temperatures from 23 to 33?°C in a recirculated water system, fed in excess with a high-energy feed (Artemia then a formulated feed, >50% protein), and examined at 1-day (first feeding days) or 4-day intervals (older fish). The temperature that produced the fastest growth (T°opt) was 31?°C at the start of exogenous feeding (0.9?mg); it increased to 32.7?°C at 8?mg then decreased by 0.7?°C for each 10-fold increase of WM. Size heterogeneity was lower and survival was higher (70–85% from 0.9?mg to 1?g) when the temperature was close to T°opt. Comparisons with other species suggest that the slope of the relationship between T°opt and fish size has a strong latitudinal component, and may also reflect the fish sensitivity to oxygen.
机译：温度效应在个体发育过程中各不相同，但在成年早期比成年鱼类成比例地变化更大。已经研究了少数物种的幼虫，但是观察到了相反的轨迹，因此很难预测温度如何影响特定物种的生长，存活和大小异质性。这项研究检查了年轻的[0.9？mg-1？g湿重（WM）] Pangasianodon hypophthalmus（最广泛养殖的热带鱼之一）中的这些相互作用。在循环水系统中将鱼从23℃升高到33℃，在5个温度下饲养，过量饲喂高能量饲料（卤虫病，然后是配方饲料，蛋白质含量> 50％），并在第1天进行检查（第一次饲喂）天）或4天间隔（较老的鱼）。生长最快的温度（T° opt ）在外源饲喂开始时为31？C（0.9？mg）。 WM每增加10倍，它就会以8？mg升高到32.7？C，然后下降0.7？C。当温度接近T° opt 时，大小异质性较低，存活率更高（从0.9？mg到1？g的70-85％）。与其他物种的比较表明，T°和鱼的大小之间的关系的斜率具有很强的纬度成分，也可能反映了鱼对氧气的敏感性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号