Responses of the fish community in a eutrophicated lake to long-term food web management assessed by multiple sampling methods

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http://hdl.handle.net/10138/333468

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Rask , M , Malinen , T , Olin , M , Peltonen , H , Ruuhijärvi , J , Vesala , S & Hietala , J 2020 , ' Responses of the fish community in a eutrophicated lake to long-term food web management assessed by multiple sampling methods ' , Hydrobiologia , vol. 847 , no. 21 , pp. 4559-4573 . https://doi.org/10.1007/s10750-020-04243-9

Title: Responses of the fish community in a eutrophicated lake to long-term food web management assessed by multiple sampling methods
Author: Rask, Martti; Malinen, Tommi; Olin, Mikko; Peltonen, Heikki; Ruuhijärvi, Jukka; Vesala, Sami; Hietala, Jaana
Contributor: University of Helsinki, University Management
University of Helsinki, Lammi Biological Station
Date: 2020-12
Language: eng
Number of pages: 15
Belongs to series: Hydrobiologia
ISSN: 0018-8158
URI: http://hdl.handle.net/10138/333468
Abstract: Fish community responses to long-term mass removal of planktivorous fish from eutrophicated Lake Tuusulanjarvi were examined during 1996-2018 by gill net test fishing, hydroacoustics with simultaneous trawling, virtual population analysis (VPA) and fish growth measurements. The gillnet catches of white bream and roach increased first while bream and bleak decreased but recovered in the early 2000s. Perch and pikeperch increased but ruffe decreased and remained low. According to hydroacoustics, pelagic fish biomass decreased. Smelt was the most abundant species at the beginning and the end of the monitoring period but bream dominated the fish biomass in most years. VPA calculations indicated a five- and threefold increase in the biomass of bream and white bream, respectively, during 2005-2011. Significant increases appeared in the growth of perch, bream and roach. Overall, the responses in the fish community structure and fish abundance to the food web management were slight and mostly masked by changes in reproduction and growth of fish and annual variability in environmental conditions such as temperature and water turbidity. Gillnet test fishing and echo sounding complemented each other well in monitoring the effects of management fishing. Where bream is one of the dominant species VPA is also recommended.
Subject: Biomanipulation
Lake restoration
Gillnet test fishing
Hydroacoustics
VPA
Fish growth
BIOMANIPULATION
RESTORATION
GILLNET
SHALLOW
ROACH
ZOOPLANKTON
POPULATION
RECOVERY
FAILURES
STOCKS
1172 Environmental sciences
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