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Activity Cycles of Adult and Juvenile Alewives, Alosa pseudoharengus, Recorded by Two Methods
Author(s) -
Richkus William A.,
Winn Howard E.
Publication year - 1979
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(1979)108<358:acoaaj>2.0.co;2
Subject(s) - juvenile , alewife , alosa , biology , fishery , zoology , ecology , fish <actinopterygii> , fish migration
Locomotor activity cycles of adult and juvenile anadromous alewives were studied in the laboratory. Activity patterns were nocturnal when mechanical sensors were used, apparently because the fish could more effectively avoid the sensors during light periods. Records from a photocell showed activity of adult and juvenile alewives to be strongly diurnal, corresponding to field observations, with activity primarily under control of exogenous light cycles. No evidence of endogenous diurnal activity cycles was observed in any of the experiments. Temperature and salinity did not influence activity levels except when temperature approached a lower stress level of 3 C.