Premium
Innate Control of Migrations of Salmon and Trout Fry From Natal Gravels to Rearing Areas
Author(s) -
Raleigh Robert F.
Publication year - 1971
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.2307/1934587
Subject(s) - salmo , inlet , oncorhynchus , rainbow trout , fishery , streams , fish <actinopterygii> , trout , upstream and downstream (dna) , biology , brown trout , ecology , salmonidae , upstream (networking) , environmental science , oceanography , geology , computer network , computer science
The upstream and downstream directional responses of demes of sockeye salmon (Oncorhynchus nerka) fry from inlet and outlet streams hatched and reared under controlled, identical conditions were tested in the laboratory. The tests compared innate directional responses of fry from the two sources to variables of water source and temperature. Both variables influenced the directional responses of the fry. The direction of migration (upstream for outlet fry or downstream for inlet fry) and response to changes in the test variables differed substantially between fry from inlet or outlet streams; this response difference held for populations of sockeye salmon from different geographical locations (Canada and Alaska). The differences were concluded to be innate in origin. Single tests of fry of rainbow (Salmo gairdneri) and cutthroat (S. clarki) trout from inlet and outlet streams indicated that directional responses of fry from these species are also innately influenced. The significance of matching the innate responses of donor stocks of fish to the characteristics of a recipient environment is discussed.