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首页> 外文期刊>North American Journal of Aquaculture >Density effects on subyearling fall Chinook Salmon during hatchery rearing in raceways with oxygen supplementation and after release.
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Density effects on subyearling fall Chinook Salmon during hatchery rearing in raceways with oxygen supplementation and after release.

机译：孵化场中在补充氧气的情况下孵化过程中以及释放后，对次年下降的奇努克鲑的密度影响。

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摘要

To determine the effects of hatchery rearing density on fall Chinook Salmon Oncorhynchus tshawytscha released as age-0 subyearlings, we experimentally reared fish at densities of 200,000, 300,000 and 400,000 fish per raceway in Michigan-style raceways that employ oxygen supplementation to achieve high density rearing. The study was conducted for two release years at a maximum raceway density of 52.3 kg/m3 and a maximum loading of 0.92 kg.L-1.min-1. At the end of hatchery rearing there was no significant difference in weight in either release year and Fulton's condition factor was similar in the first year. In the second release year condition factors were significantly different; the low-density group had significantly lower values and the high-density group had significantly higher values. Following release into the Umatilla River, Oregon, out-migration survival and travel time to John Day Dam on the Columbia River was monitored by using passive integrated transponder tags in a subsample of each release group. We found no significant difference in either out-migration survival or travel time between density groups. We used recoveries of coded wire tags to estimate smolt-to-adult survival (SAS) and straying. There was no significant difference in SAS, consequently the high-density treatment produced nearly twice as many adults as the low-density and 27% more adults than the medium density. Straying rates ranged between 61% and 66% for each density group and were not significantly different. Rearing density had no effect on the gender or age distribution of returning adults. Our results indicate that high-density rearing of subyearling fall Chinook Salmon in Michigan-style raceways is useful for increasing adult production.Digital Object Identifier http://dx.doi.org/10.1080/15222055.2012.711276
机译：为了确定孵化场饲养密度对作为0岁以下子代放养的秋努克鲑鱼Oncorhynchus tshawytscha的影响，我们在密歇根州式航道中通过添加氧气来实现高密度饲养的密歇根式航道中的每个航道以200,000、300,000和400,000的密度养鱼。该研究进行了两个释放年，最大滚道密度为52.3 kg / m 3 ，最大载荷为0.92 kg.L -1 .min - 1 。在孵化场饲养结束时，两个释放年份的体重没有显着差异，第一年的富尔顿条件因子相似。在第二个发布年份中，条件因素显着不同;低密度组的值明显较低，而高密度组的值明显较高。在释放到俄勒冈州的Umatilla河后，通过在每个释放组的子样本中使用无源集成应答器标签来监视迁徙生存和到哥伦比亚河上约翰·戴大坝的旅行时间。我们发现在密度不同的人群之间，无论是迁徙生存还是旅行时间都没有显着差异。我们使用了编码的电线标签的回收率来估算从鲑到成人的生存率（SAS）和流浪。 SAS没有显着差异，因此，高密度处理所产生的成年人几乎是低密度成年人的两倍，比中密度成年人多27％。每个密度组的流失率在61％至66％之间，差异不显着。饲养密度对返回成年人的性别或年龄分布没有影响。我们的结果表明，在密歇根州风格的赛道中高密度饲养亚秋秋季的奇努克鲑鱼有助于增加成年产量。数字对象标识符http://dx.doi.org/10.1080/15222055.2012.711276

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