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Recapture of pond‐ and hatchery‐reared brown trout, Salmo trutta L., released in small streams
Author(s) -
JOHNSEN B. O.,
HESTHAGEN T.
Publication year - 1990
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1990.tb00461.x
Subject(s) - salmo , hatchery , brown trout , fishery , electrofishing , biology , stocking , streams , trout , mark and recapture , fish <actinopterygii> , fish hatchery , fish farming , aquaculture , population , computer network , demography , sociology , computer science
. Two groups of 0+ brown trout, Salmo trutta L., one pond‐reared and one hatchery‐reared (fish length 32‐80mm), were released in eight small streams in three different areas of Norway between 1984 and 1987. Hatchery and pond fish were reared at different sites, but releases were made both near the rearing site and in the home area of the other group. A total of 2550 fish were recaptured by electrofishing the year after stocking. We found great variations in the recapture rates of pond and hatchery fish in one stream between years, and between streams in different areas the same year. These results indicate that the rearing method is not essential to the recapture rate. Both pond and hatchery fish generally had higher recapture rates in streams near their rearing site than in the distant areas. Thus factors associated with transportation seem to influence the survival of stocked fish. The results also indicate that size at stocking may be an important factor for the recapture rate.