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Rheotaxis of Young Arctic Grayling from Populations That Spawn in Inlet or Outlet Streams of a Lake
Author(s) -
Kaya Calvin M.
Publication year - 1989
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1989)118<0474:royagf>2.3.co;2
Subject(s) - grayling , spawn (biology) , inlet , streams , weir , arctic , biology , fishery , ecology , oceanography , geography , geology , computer network , cartography , computer science
Rheotactic behavior of young Arctic grayling Thymallus arcticus from two populations that spawn in inlet or outlet streams of a lake and from reciprocal crosses between the two populations was tested in an artificial stream at flow velocities up to 7 cm/s. Fertilized eggs from wild fish and the resulting young from the two populations were incubated and reared under identical conditions in a hatchery before being tested. Young fish from both populations (referred to as inlet and outlet young) were tested at the time of initial swim‐up and at 11–41 d after swimup. Outlet young had a significantly greater tendency to swim upstream than inlet young at temperatures of 10 (newly emerged but not older young), 12, and 16°C under both full (10.1–15.6 μmol·s −1 ·m −2 ) and dim (0.03–0.05 μmol·s −1 ·m −2 ) light conditions. Young from reciprocal crosses had intermediate responses at 12 and 16°C. However, both outlet and inlet young had similar, very weak, upstream responses when tested in darkness or (except for newly emerged young) at 10°C. Directional responses to water current appeared to be innate and genetically based but may be subject to environmental modification.