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首页> 外文期刊>Ecology of Freshwater Fish >Comparison of physiological smolt status in descending andnondescending wild brown trout (Salmo trutta) in a Danish stream
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Comparison of physiological smolt status in descending andnondescending wild brown trout (Salmo trutta) in a Danish stream

机译：丹麦溪流中降序和不降序野生褐鳟（Salmo trutta）的生理性status状态比较

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摘要

Downstream movement of a wild population of brown trout was examined in a small Danish stream in relation to morphological and physiological smolt status from March to May. Downstream movement was monitored in a Wolf-type trap covering all possible passage routes in the stream. Trout caught in the trap were classified as parr, pre-smolt or smolt based on morphological criteria and compared with trout randomly caught by electrofishing upstream of the trap. Representative gill samples from trap-caught and electrofished trout were analysed for gill Na super(+), K super(+)-ATPase activity and used as a measure of physiological smolt status. Only a few parr occurred in the trap. Few pre-smolts occurred in the trap evenly in March and early April. In late April, pre-smolt movement peaked. By comparison, the main downstream movement of smolts occurred in distinct peaks through late March and April. The majority of fish caught in the trap were judged as pre-smolts or smolts based on morphological criteria's and they were characterised by relatively high gill Na super(+), K super(+)-ATPase activity compared with trout judged as parr. Trout caught by electrofishing upstream the trap, were classified as parr, pre-smolts and smolts early in the season (March). During and after the main smolt-run in April the distribution of the remaining trout in the brook became skewed in favour of pre-smolt and parr. The study suggests that smolting trout initiate downstream movement once having reached a certain physiological smolt condition (judged by increased gill Na super(+), K super(+)-ATPase activity).
机译：在3月至5月间，在一条丹麦小溪流中检查了一条野生鳟鱼种群的下游运动与形态和生理上的软体动物状态有关。在沃尔夫式捕集阱中监测下游运动，该捕集阱覆盖了溪流中所有可能的通道。根据形态学标准，将捕获在诱捕器中的鳟鱼归类为“ parr”，“前熏鲑”或“熏鲑”，并与通过诱捕器上游电钓随机捕获的鳟鱼进行比较。分析了陷阱捕捞和电鱼鳟鱼的代表性g样本的Na Na super（+），K super（+）-ATPase活性，并将其用作生理性软体动物状态的量度。陷阱中只有几个parr。在三月和四月初，陷阱中几乎没有发生预臭。在四月下旬，前田鼠运动达到了顶峰。相比之下，在三月下旬和四月下旬，主要的下游移栖活动发生在不同的高峰期。根据形态学标准将捕获在诱捕器中的大多数鱼类判断为是前蜕皮鱼或软体动物，与and鱼相比，其特征在于其supersuper（+），钾super（+）-ATPase活性较高。在捕捞陷阱上游被电鱼捕捞的鳟鱼在该季节的早期（3月）被归类为幼鱼，前s和and。在四月份进行的一次主要熏鲑活动期间和之后，小溪中剩余鳟鱼的分布偏向于熏鲑前和幼鲑。该研究表明，鲑鳟一旦达到某种特定的生理状态，就会开始下游运动（由g Na super（+），K super（+）-ATPase活性的增加来判断）。

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