Behaviourally mediated thermal experience in relation to final oocyte maturation by free-swimming barfin flounder (Verasper moseri)
Behaviourally mediated thermal experience in relation to final oocyte maturation by free-swimming barfin flounder (Verasper moseri)
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行为介导的热体验与自由游动的条鳍鲽 (Verasper moseri) 最终卵母细胞成熟的关系
DOI：
10.1016/j.fishres.2016.08.023
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发表时间：
2017
影响因子：
2.4
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Kawabe;R.;Nakatsuka;N.;Wada;T.;Sawaguchi;S.;Murakami;O.;Kamiyama;K.;Kito;K.;Furukawa;S.;Kayaba;T.
巴鳍比目鱼(Verasper Moseri)是一种在2-4月(北方冬季)野外产卵的多批次产卵者，其繁殖性能对温度扰动特别敏感。圈养比目鱼的最终卵母细胞成熟(FOM)只有在卵黄发生后经历缓慢升高的水温(SETR)(一个月从2摄氏度到6摄氏度)时才会发生。我们使用电子标签来显示卵黄发生后的比目鱼在产卵前向南迁徙到距离北海道沿海水域(CWH；40.2-43.4°N)夏季摄食场约750公里的位置时，如何经历SETR的产卵前迁移。从2010年到2012年，我们总共标记了208V。12月初，在CWH的饲养场，卵黄蛋白原掺入卵母细胞几乎完成。回收了102个标签，下载了98个标签的数据。所有被标记的雌性在1月底之前都搬到了海外。与12月(6-8摄氏度，33-59米)相比，1月份鱼在寒冷和更深的水域(3-4摄氏度，351-380米)停留的时间更多，但在产卵期前后的2月和3月经历了更温暖的温度(5.1-5.7摄氏度，367-396米)。所有被标记的鱼都经历了SETR，然后在1月份经历了SETR的发作，尽管被标记的鱼的SETR在个体之间有很大的差异。数据记录仪记录的深度温度数据与海洋水平温度条件之间的比较表明，鱼类没有经历铁杉暖流的温暖表层水，而是通过迁移到较冷的Oyashio水中，在2月和3月经历了更深的水，最后经历了更暖的水。综上所述，SETR似乎是导致野生FOM的外源因素之一。
The reproductive performance of barfin flounder (Verasper moseri), a multi-batch spawner spawning during February-April (boreal winter) in the wild, is particularly sensitive to temperature perturbations. Final oocyte maturation (FOM) of captive flounder occurred only when post-vitellogenesis fish experienced a slowly-elevated water temperature regime (SETR) (from 2 °C to 6 °C over a month). We used electronic tags to show how post-vitellogenesis flounder experience SETR during its pre-spawning migration, during their southward migration, to a location about 750 km from the summer feeding grounds in the coastal waters of Hokkaido (CWH; 40.2–43.4°N). From 2010 through 2012, we tagged a total of 208V. moseriin early December at the feeding grounds of the CWH, during in which vitellogenin incorporation into oocyte was almost completed. One hundred and two tags were recovered and the data from 98 were downloaded. All of the tagged females moved offshore by the end of January. Fish spent more time in cold and deeper waters (3–4 °C, 351–380 m) in January than they did in December (6–8 °C, 33–59 m), but experienced warmer temperatures (5.1–5.7 °C, 367–396 m) in February and March around the spawning period. All tagged fish experienced SETR and then experienced the onset of SETR in January, although SETR of tagged fish have large variations among individuals. A comparison between depth-temperature data recorded by data-logger and oceanic horizontal temperature conditions suggests that fish did not experience warm surface water of the Tsugaru Warm Current, a branch of the Kuroshio that flows into the Pacific Ocean via the Tsugaru Strait, and instead were in the colder Oyashio water by migrating deep and finally experiencing warmer water in February and March. In conclusion, SETR appears to be one of the exogenous factors that induces FOM in the wild.