The effect of water temperature, prey availability and presence of conspecifics on prey consumption of pikeperch (Sander lucioperca)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12520%2F22%3A43905728" target="_blank" >RIV/60076658:12520/22:43905728 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.17221/162/2022-CJAS" target="_blank" >https://doi.org/10.17221/162/2022-CJAS</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.17221/162/2022-CJAS" target="_blank" >10.17221/162/2022-CJAS</a>

Result language

angličtina

Original language name

The effect of water temperature, prey availability and presence of conspecifics on prey consumption of pikeperch (Sander lucioperca)

Original language description

In this study, the effect of water temperature, predator&apos;s sex, prey density, and the presence of conspecifics on prey consumption of pikeperch (Sander lucioperca) was experimentally tested. In Experiment 1, predators of both sexes [males: total length (TL) = 473 +/- 22 mm and body weight (BW) = 1 070 +/- 100 g and females: TL = 464 +/- 12 mm and BW = 1 060 +/- 100 g] were kept in separate tanks and exposed to different densities of prey ( Pseudorasbora parva; 3, 6, 12, 24 and 48 prey fishes per tank) under fixed water temperatures of 4.5 degrees C, 8.5 degrees C, and 12.5 degrees C. After 63 days of this experiment, it was found that pikeperch predation was significantly affected by increasing water temperature. The effect of prey density was significant at all tested temperatures. Pikeperch females tended to have the higher prey consumption than males, although that trend was statistically insignificant. Results suggest that increased feeding demands at temperatures above 4.5 degrees C can lead to predator starvation in conditions of low prey availability. Due to the higher prey consumption, pikeperch females could be more vulnerable to low prey availability during their culture. In Experiment 2, pikeperch were kept at different densities of 1, 2, 4, and 8 individuals per tank supplied with a prey rate of 50 individuals per predator, ensuring ad libitum feeding rate. The average daily prey consumption was significantly higher in the tanks with multiple predators, accounting for 17.6 +/- 3.57 prey fishes/day compared to 11.6 +/- 2.33 prey fishes/day in the tank with a single predator. These results indicate that pikeperch predation activity and prey consumption can be significantly affected by the water temperature, prey availability, and the presence of conspecifics. The findings contribute to understanding the predatory function, natural feeding request of pikeperch and its potential importance for broodstock culture and broodstock final maturation for a successful spawning season. Also, this information can be used for better management of pikeperch pond aquaculture or bio-melioration process in open water bodies and ecosystems.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10617 - Marine biology, freshwater biology, limnology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Czech Journal of Animal Science : Živočišná výroba

ISSN

1212-1819

e-ISSN

1805-9309

Volume of the periodical

67

Issue of the periodical within the volume

11

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

9

Pages from-to

465-473

UT code for WoS article

000913670600004

EID of the result in the Scopus database

2-s2.0-85147714352