Distribution patterns, annual density changes, growth and mortality of pikeperch [Sander lucioperca (L. 1758)] fry following oligotrophication of a reservoir

IF 1.6 3区 农林科学 Q3 FISHERIES
Tomáš Jůza, Petr Blabolil, Martin Čech, Vladislav Draštík, Josef Hejzlar, Luboš Kočvara, Milan Muška, Jiří Peterka, Zuzana Sajdlová, Michal Tušer, Mojmír Vašek, Jan Kubečka
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引用次数: 2

Abstract

Until 2006, the Lipno Reservoir had the largest catches of pikeperch in the Czech Republic, but since 2007 it has partially collapsed. This collapse was preceded by oligotrophication, when phosphorus concentrations declined by 25%. Conservation measures from 2009 to 2015 partially improved the population from 2015, but pikeperch biomass did not reach previous levels. Unsuccessful spawning and low survival of pikeperch fry were suspected as possible reasons. Pelagic trawling for pikeperch younger juveniles in June and older juveniles in August indicated that extreme mortality in the first year of life, rather than limited spawning, was the reason for low pikeperch recruitment. Large interannual differences in pikeperch density were observed in both spring and summer, and the growth was generally low. Pikeperch fry density changed over a trophic gradient with the highest densities in the eutrophic upper reservoir parts, while differences between depths were much less pronounced due to the lack of temperature and oxygen depth stratification in summer. Oligotrophication of the reservoir in recent years is probably partly responsible for the high mortality and slow growth of pikeperch fry that are still zooplanktivorous, resulting in a lower probability of surviving their first winter. Given the changing conditions in the reservoir, measures should be taken to strictly conserve populations to maintain self-sustaining pikeperch populations in the Lipno Reservoir.

水库寡养化后斑刺鱼的分布模式、年密度变化、生长和死亡率
直到2006年,利普诺水库还是捷克共和国最大的刺猬鱼捕获量,但自2007年以来,它已经部分崩溃。这种崩溃之前是低营养化,磷浓度下降了25%。2009 - 2015年的保护措施使棘鲈种群数量较2015年有所改善,但其生物量没有达到之前的水平。怀疑梭鲈鱼苗产卵不成功和成活率低是可能的原因。6月和8月对梭鲈幼鱼和成年梭鲈进行的远洋拖网捕捞表明,梭鲈在第一年的死亡率极高,而不是产卵量有限,是梭鲈招募率低的原因。春、夏季鼠鲈鱼密度年际差异较大,生长普遍较低。鲈鱼鱼苗密度在一个营养梯度上变化,富营养化水库上部鱼苗密度最高,而由于夏季缺乏温度和氧气深度分层,不同深度之间的差异不太明显。水库近年来的少营养化可能部分地导致了仍以浮游动物为食的刺鲈鱼苗的高死亡率和缓慢生长,导致它们存活第一个冬天的可能性较低。鉴于水库条件的变化,应采取严格的种群保护措施,以保持利普诺水库大鼠种群的自持能力。
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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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