Fluctuations in pelagic fish density linked to ambient conditions

Holubová, Michaela; Hejzlar, Josef; Čech, Martin; Vašek, Mojmír; Blabolil, Petr; Peterka, Jiří

doi:10.1111/jfb.14622

Journal of Fish Biology

2020

DOI: 10.1111/jfb.14622

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Fluctuations in pelagic fish density linked to ambient conditions

Michaela Holubová

Josef Hejzlar

Martin Čech

et al.

Abstract: Animal behaviour has been broadly studied for its social or functional aspects but less often for understanding the interactions between organisms and their ambient conditions. A pilot observational study was performed by means of underwater camera to investigate the correlation between environmental factors and the density of fish in the epipelagic habitat of a European temperate reservoir. Explored factors confirmed a positive correlation between water temperature and all observed categories: nonpredatory, p… Show more

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Cited by 3 publications

References 78 publications

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Towards modeling data-poor lakes at the regional scale using parameters from data-rich lakes and relationships to lake characteristics

Côté,

Englund,

Andersen

et al. 2023

Inland Waters

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Towards modeling data-poor lakes at the regional scale using parameters from data-rich lakes and relationships to lake characteristics

Côté,

Englund,

Andersen

et al. 2023

Inland Waters

View full text Add to dashboard Cite

Impacts of climate‐related stressors on social group cohesion and individual sociability in fish

Tiddy,

Munson,

Cortese

et al. 2024

Biological Reviews

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Group‐living in animals comes with a number of benefits associated with predator avoidance, foraging, and reproduction. A large proportion of fish species display grouping behaviour. Fish may also be particularly vulnerable to climate‐related stressors including thermal variation, hypoxia, and acidification. As climate‐related stressors are expected to increase in magnitude and frequency, any effects on fish behaviour may be increased and affect the ability of fish species to cope with changing conditions. Here we conduct a systematic review of the effects of temperature, hypoxia, and acidification on individual sociability and group cohesion in shoaling and schooling fishes. Searches of the published and grey literature were carried out, and studies were included or excluded based on selection criteria. Data from studies were then included in a meta‐analysis to examine broad patterns of effects of climate‐related stressors in the literature. Evidence was found for a reduction in group cohesion at low oxygen levels, which was stronger in smaller groups. While several studies reported effects of temperature and acidification, there was no consistent effect of either stressor on sociability or cohesion. There was some evidence that marine fishes are more strongly negatively affected by acidification compared with freshwater species, but results are similarly inconsistent and more studies are required. Additional studies of two or more stressors in combination are also needed, although one study found reduced sociability following exposure to acidification and high temperatures. Overall, there is some evidence that hypoxia, and potentially other climate‐related environmental changes, impact sociability and group cohesion in fishes. This may reduce survival and adaptability in shoaling and schooling species and have further ecological implications for aquatic systems. However, this synthesis mainly highlights the need for more empirical studies examining the effects of climate‐related factors on social behaviour in fishes.

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Dominance and size affect foraging position choice by Arctic grayling (Thymallus arcticus)

Holubová,

Peterka,

Simon

et al. 2024

Journal of Fish Biology

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Salmonid fishes are a widespread and economically important group of fishes that are strongly affected by anthropogenic environmental degradation. Consequently, studies on their behavior and ecology are essential for their conservation. Wild Arctic grayling (Thymallus arcticus) were observed in an unimpacted Alaskan river using underwater video observations for two consecutive summers (2015 and 2016). Foraging, aggressive behavior, and position held by individual fish were quantified. Fish held focal positions in the water column most of the time (mean = 81%), active foraging was observed for 14% of the observation periods, and antagonistic interactions occurred during 5% of the time. The analysis of intraspecific aggression revealed that aggressive interactions occurred between conspecifics of similar sizes (±100 mm), although the winners of bouts were significantly larger than the losers. Notably, initiators emerged as more successful in these bouts compared to receivers, irrespective of body length. These findings underscore the significance of conducting field studies to gain valuable insights into the behavior of fish in their natural stream environments.

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Fluctuations in pelagic fish density linked to ambient conditions

Cited by 3 publications

References 78 publications

Towards modeling data-poor lakes at the regional scale using parameters from data-rich lakes and relationships to lake characteristics

Towards modeling data-poor lakes at the regional scale using parameters from data-rich lakes and relationships to lake characteristics

Impacts of climate‐related stressors on social group cohesion and individual sociability in fish

Dominance and size affect foraging position choice by Arctic grayling (Thymallus arcticus)

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