Effects of domestication on growth physiology and endocrinology of Atlantic salmon (Salmo salar)
Effects of domestication on growth physiology and endocrinology of Atlantic salmon (Salmo salar)
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DOI：
10.1139/f02-082
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发表时间：
2002-08-01
影响因子：
2.4
通讯作者：
Björnsson, BT
中科院分区：
文献类型：
--
作者：
Fleming, IA;Agustsson, T;Björnsson, BT
鱼类的选择程序经常将生长速度作为育种目标，但令人惊讶的是，人们对生长过程的潜在机制知之甚少。因此，本研究的目的是检查是否人工选择的过程中，大西洋鲑鱼（萨尔莫salar），导致了更高的增长率导致在生长激素（GH）-胰岛素样生长因子I（IGF-I）轴的内分泌生长调节的根本变化。这是通过比较类似饲养的第七代农场鲑鱼与野生鲑鱼从农场菌株的主要创始人人口在三个生命阶段进行测试。毫不意外的是，驯养的鱼比野生的鱼长得更大;这在盐水中最为明显，到最后它们的平均重量是野生鱼的三倍。生长速度与生长速度呈正相关，生长速度快的驯化鱼的生长激素含量显著高于野生鱼。血浆GH水平也显着较高的驯化鱼，而IGF-I水平没有差异。这些研究结果提供了一些第一个直接的证据表明驯化选择生长和内分泌调节之间的联系，其中具有更活跃的内分泌生长调节成分的个体是有针对性的。
Selection programs for fish frequently target growth rate as a breeding goal, yet surprisingly little is known about which mechanisms underlying the growth process are being targeted. The aim of this study was thus to examine whether the process of artificial selection of Atlantic salmon (Salmo salar) that has resulted in higher growth rate resulted in underlying changes in the growth hormone (GH) - insulin-like growth factor I (IGF-I) axis of endocrine growth regulation. This was tested by comparing similarly reared seventh-generation farm salmon with wild salmon from the principal founder population of the farm strain at three life stages. Not unexpectedly, the domesticated fish outgrew their wild counterparts; this was most evident in salt water, where they averaged three times the weight by the end. Pituitary GH content was positively correlated with growth rate and correspondingly was significantly higher in the faster growing domesticated fish than in the wild fish. Plasma GH levels were also significantly higher in the domesticated fish, whereas IGF-I levels did not differ. These findings provide some of the first direct evidence indicating a link between domestication selection for growth and its endocrine regulation, whereby individuals with more active endocrine growth regulatory components are targeted.