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Dispersal of wild and domestic masu salmon fry ( Oncorhynchus masou ) in an artificial channel
Author(s) -
Nagata M.,
Nakajima M.,
Fujiwara M.
Publication year - 1994
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1994.tb01289.x
Subject(s) - biology , biological dispersal , oncorhynchus , fishery , stock (firearms) , upstream and downstream (dna) , ecology , upstream (networking) , fish <actinopterygii> , geography , computer network , population , demography , archaeology , sociology , computer science
The day and night pattern of upstream and downstream dispersal of masu salmon fry of wild and domestic origin was compared in artificial channels (45 m long), for two ages of planting: unfed alevins and eyed eggs. Early dispersal was important for the wild stock (48–50%) compared with the domestic one (16–36%). More wild fry moved downstream than upstream, and more domestic fry dispersed upstream. Upstream movement in wild and domestic fry was more active by day than by night, except for wild fry planted as eyed eggs, where upstream migration was higher at night. In contrast, downstream movement in wild and domestic fry was more common by night than by day, but daylight catches were not negligible for the wild stock.