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Response of resident brown trout, Salmo trutta L., and rainbow trout, Oncorhynchus mykiss (Walbaum), to the stocking of hatchery‐reared brown trout
Author(s) -
Weiss S.,
Schmutz S.
Publication year - 1999
Publication title -
fisheries management and ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 55
eISSN - 1365-2400
pISSN - 0969-997X
DOI - 10.1046/j.1365-2400.1999.00165.x
Subject(s) - brown trout , salmo , rainbow trout , stocking , hatchery , fishery , biology , catch and release , fish <actinopterygii> , recreational fishing
Two strains of hatchery‐reared adult brown trout, Salmo trutta L., [208–334 mm total length (TL); n = 591] were individually marked and released into a limestone stream. The estimated survival after one month (86%; n = 508) was comparable to that for resident brown trout and rainbow trout, Oncorhynchus mykiss (Walbaum), (89%; n = 771), but declined to 14% ( n = 83) after 8 months compared with 52% ( n = 451) for resident trout. The movement of resident trout out of stocked stretches was higher (14%) than from control sites (5%), but the population size in both individual sites and the overall study area were unaffected. The growth of resident brown trout was unaffected by stocking, but rainbow trout showed lower growth rates in stocked versus unstocked stretches both one and 8 months after stocking ( P < 0.002).