<abstract xmlns="http://www.w3.org/1999/xhtml"><p> The aim of this study was to determine the impact of filamentous algae on the growth and survival of juvenile narrow-clawed crayfish, Astacus leptodactylus (Esch.), in rearing basins. Three stocking variants were used: A - basins with a layer of filamentous algae without imitation mineral substrate; B - basins with a layer of filamentous algae with imitation mineral substrate; C - basins without filamentous algae but with mineral substrate. The crayfish were reared from June 12 to October 10 under natural thermal conditions and fed a commercial feed. The results indicated that the presence of the filamentous algae did not have a statistically significant impact on the growth of the juvenile crayfish (P > 0.05). The presence of the filamentous algae had a strong negative impact on juvenile crayfish survival and stock biomass (P &lt; 0.05). The layer of gravel and small stones that imitated the mineral substrate of natural aquatic basins somewhat neutralized the disadvantageous impact the filamentous algae had on the crayfish.</p></abstract>

The aim of this study was to determine the impact of filamentous algae on the growth and survival of juvenile narrow-clawed crayfish, Astacus leptodactylus (Esch.), in rearing basins. Three stocking variants were used: A - basins with a layer of filamentous algae without imitation mineral substrate; B - basins with a layer of filamentous algae with imitation mineral substrate; C - basins without filamentous algae but with mineral substrate. The crayfish were reared from June 12 to October 10 under natural thermal conditions and fed a commercial feed. The results indicated that the presence of the filamentous algae did not have a statistically significant impact on the growth of the juvenile crayfish (P > 0.05). The presence of the filamentous algae had a strong negative impact on juvenile crayfish survival and stock biomass (P < 0.05). The layer of gravel and small stones that imitated the mineral substrate of natural aquatic basins somewhat neutralized the disadvantageous impact the filamentous algae had on the crayfish.

Harmful impact of filamentous algae (Spirogyra sp.) on juvenile crayfish

Department of Lake Fisheries in Giżycko Inland Fisheries Institute in Olsztyn, Poland ul. Rajska 2, 11-500 Giżycko

Fisheries & Aquatic Life

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Harmful impact of filamentous algae (Spirogyra sp.) on juvenile crayfish"}

The aim of this study was to determine the impact of filamentous algae on the growth and survival of juvenile narrow-clawed crayfish, Astacus leptodactylus...

Harmful impact of filamentous algae (Spirogyra sp.) on juvenile crayfish

Published Online: Feb 03, 2016

Page range: 223 - 226

Received: Sep 28, 2015

Accepted: Nov 27, 2015

DOI: https://doi.org/10.1515/aopf-2015-0025

Keywords
Astacus leptodactylus, crayfish, filamentous algae, Spirogyra

© Archives of Polish Fisheries

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Harmful impact of filamentous algae (Spirogyra sp.) on juvenile crayfish

Published Online: Feb 03, 2016

Page range: 223 - 226

Received: Sep 28, 2015

Accepted: Nov 27, 2015

DOI: https://doi.org/10.1515/aopf-2015-0025

KeywordsAstacus leptodactylus, crayfish, filamentous algae, Spirogyra

© Archives of Polish Fisheries

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Astacus leptodactylus, crayfish, filamentous algae, Spirogyra