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Harvest Rates of Rheophilic Fish Vimba vimba , Chondrostoma nasus , and Barbus barbus Have a Strong Relationship with Restocking Rates and Harvest Rates of Their Predator Silurus glanis in Lowland Mesotrophic Rivers in Central Europe

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  • Roman Lyach

    (Institute for Evaluations and Social Analyses (INESAN), Sokolovská 25, 186 00 Prague, Czech Republic)

Abstract

The European catfish Silurus glanis (Linnaeus, 1758) is an expanding apex piscivorous predator whose predation may drive fish harvest rates and fish populations. This study aimed to analyze the relationships between intensive catfish stocking/harvesting and harvest rates of putative catfish prey–three rheophilic fish species: vimba bream Vimba vimba , nase Chondrostoma nasus, and barbel Barbus barbus (Linnaeus, 1758). The GAM (generalized additive model) was used to analyze the relationships between the harvest rate and the stocking intensity rate of the catfish and the three rheophilic fish species. The harvest rates and stocking intensity rates were obtained from mandatory angling logbooks collected from 38,000 individual recreational anglers by the Czech Fishing Union on 176 fishing sites over the years 2005–2017 in central Bohemia and Prague (the Czech Republic). Our results show that a higher intensity of catfish stocking and harvesting resulted in a lower harvest rate of rheophilic fishes. Conversely, the stocking rates of rheophilic fishes were not significantly correlated to their harvest rates. In conclusion, a significant negative relationship was found between the harvest rate and the restocking rates of rheophilic fishes and their predator, suggesting that fisheries managers should not perform intensive stocking of both catfish and rheophilic fishes on the same rivers.

Suggested Citation

  • Roman Lyach, 2021. "Harvest Rates of Rheophilic Fish Vimba vimba , Chondrostoma nasus , and Barbus barbus Have a Strong Relationship with Restocking Rates and Harvest Rates of Their Predator Silurus glanis in Lowland Mes," Sustainability, MDPI, vol. 13(20), pages 1-14, October.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:20:p:11379-:d:656787
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    1. Cristina Simeanu & Emanuel Măgdici & Benone Păsărin & Bogdan-Vlad Avarvarei & Daniel Simeanu, 2022. "Quantitative and Qualitative Assessment of European Catfish ( Silurus glanis ) Flesh," Agriculture, MDPI, vol. 12(12), pages 1-17, December.

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