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Seasonal formation of annual rings on the scales of Baikal grayling inhabiting the middle reaches of the Yenisei River under altered temperature regime
Environmental Biology of Fishes ( IF 1.4 ) Pub Date : 2021-09-27 , DOI: 10.1007/s10641-021-01155-y
Ivan V. Zuev 1 , Pavel Yu. Andrushchenko 1, 2 , Tatiana A. Zotina 1, 2
Affiliation  

The seasonal formation of annual rings on the scales of Baikal grayling from the middle reaches of the Yenisei River has been studied to find out the reasons for the high growth rate of the grayling under altered temperature regime downstream of the dam of the Krasnoyarsk Hydroelectric Plant. The number of circuli outside the last identified annuli and in the second, third, and fourth completed annuli was estimated on 569 fish caught during the annual cycle. The von Bertalanffy growth function was used to describe the increment in the number of circuli over a year. The calculation showed that a new annual ring was produced in July. In November, there was no statistically significant difference between the circulus number in scale increment and the circulus number in the corresponding completed annuli of older fish. Thus, despite the increased duration of the period with optimal water temperatures downstream of the dam of the Krasnoyarsk Hydroelectric Plant, fish growth was observed in a limited period of the year, from July to November. The probable reason for the high growth rate of grayling in the study area is that the fish do not have to waste energy on seasonal migration to the tributaries. Taking into account that grayling biomass production in the middle Yenisei occurs from July to November, we can recommend shifting the dates of commercial fishing for grayling to the end of this period—November–December.



中文翻译:

叶尼塞河中游地区贝加尔河鳟鱼尺度上年轮的季节性形成在变化的温度条件下

研究了叶尼塞河中游贝加尔河鳟鱼尺度上年轮的季节性形成,以找出克拉斯诺亚尔斯克水电站大坝下游温度变化条件下河豚鱼高增长率的原因。估计在年度周期捕获的 569 条鱼中,在最后一个确定的环带之外以及在第二、第三和第四个已完成环带中的环带数量。von Bertalanffy 增长函数用于描述一年中环数的增量。计算表明,新的年轮是在 7 月产生的。11月,规模增量的环数与相应的老鱼完整环中的环数无统计学差异。因此,尽管克拉斯诺亚尔斯克水电站大坝下游最佳水温的持续时间有所增加,但在一年中的有限时间段(7 月至 11 月)观察到鱼类生长。研究区鳟鱼的高增长率的可能原因是鱼类不必在季节性迁移到支流时浪费能量。考虑到叶尼塞中部的鳟鱼生物量生产发生在 7 月至 11 月,我们建议将鳟鱼的商业捕捞日期推迟到这一时期的结束时间——11 月至 12 月。研究区鳟鱼的高增长率的可能原因是鱼类不必在季节性迁移到支流时浪费能量。考虑到叶尼塞中部的鳟鱼生物量生产发生在 7 月至 11 月,我们建议将鳟鱼的商业捕捞日期推迟到这一时期的结束时间——11 月至 12 月。研究区鳟鱼的高增长率的可能原因是鱼类不必在季节性迁移到支流时浪费能量。考虑到叶尼塞中部的鳟鱼生物量生产发生在 7 月至 11 月,我们建议将鳟鱼的商业捕捞日期推迟到这一时期的结束时间——11 月至 12 月。

更新日期:2021-09-28
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