Premium
Stranding of pond‐ and hatchery‐reared juvenile brown trout, Salmo trutta L., during draw‐down of a pond
Author(s) -
HESTHAGEN T.,
HEGGE O.
Publication year - 1992
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.1365-2109.1992.tb00783.x
Subject(s) - hatchery , salmo , biology , fishery , brown trout , fish hatchery , juvenile , trout , fish <actinopterygii> , zoology , juvenile fish , aquaculture , fish farming , ecology
. One thousand each of pond and hatchery reared 0+ brown trout, Salmo trutta L., were fin‐clipped and released in a 1300‐m 2 large earthen pond. The pond was drawn down 5 days after the introduction, and descending individuals were caught in a trap at the outlet. A total of 904 pond‐reared and 890 hatchery‐reared fish were recaptured, i.e. a loss of 9·6 and 110% respectively, A total of 25 pond‐reared and 16 hatchery reared fish were recorded stranded in the pond during the draw‐down, accounting for 2·7 and 1·8% of total recoveries. Pond‐reared fish descended significantly earlier than did hatchery fish. Most individuals descended during the first 4·5h (75‐83%). However, the final recoveries were made 10 days (233h) after the first descent.