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- W2333142803 abstract "Lake Hjalmaren is a shallow eutrophic lake with an intense commercial fishery. The pikeperch is the most important species from an economical point of view. A total of 2 299 individuals with a total length of 22-39.5 cm were marked with Dart tags during late June-early August 1990. The fish were caught in commercial trap-nets, measured, marked and released immediately at the place of capture. In total 1 900 recaptures were recorded and the number of recaptured individuals were 887 (38.6%). Six individuals were recaptured 20 times and one fish 39 times in trap-nets, before it was caught and killed in a gill-net. These figures show that the fishing is intense. 48% of the fish that were recaptured once and released were recaptured also a second time. They also show that the young pikeperch tolerate capture in trap-nets and also survive post-capture handling before the release quite well. The pikeperch showed a very stationary behav iour during the growth season and many individuals were captured repeatedly in the same trap-net, both during the season of tagging and following seasons. On average pikeperch smaller than 30 cm were caught less than 2 km from the point of release, whereas fish 35-39 cm on average were caught 4-5 km away during summer. In the autumn the pikeperch moved from shallower areas to the deeper central part of the lake and were caught in gill-nets in the winter-fishery. The average rate of growth of pikeperch in the size 25-30 cm at the time of marking was 51 mm/365 days until they reached 40 cm (legal size limit). After that, the size selective gill-net fishery significantly affected the average growth rate, by catching and removing the most fast growing individuals." @default.
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- W2333142803 date "1996-01-01" @default.
- W2333142803 modified "2023-09-26" @default.
- W2333142803 title "Survival after catch in trap-nets, movements and growth of the pikeperch (Stizostedion lucioperca) in Lake Hjälmaren, Central Sweden" @default.
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