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The relation between stock size and progeny of Atlantic salmon, Salmo salar L., in a Scottish stream
Author(s) -
Buck R. J. G.,
Hay D. W.
Publication year - 1984
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.1095-8649.1984.tb04771.x
Subject(s) - salmo , biology , juvenile , fishery , range (aeronautics) , stock (firearms) , zoology , ecology , fish <actinopterygii> , mechanical engineering , materials science , engineering , composite material
Large variations in the number of female adult salmon spawning in the Girnock Burn each year (range 28–127) produced smaller variations each year (range 2900–5600) in the number of juvenile migrants. The relative constancy of the parr migrations was achieved by changes in their age composition. There may be no advantage in allowing ova deposition to exceed a level around 200 000 (3.4 m −2 ) in the Girnock Burn, which would give rise to an average of about 4000 juvenile migrants (0.07 m −2 ) per season. Large numbers of ova (up to 12.5 m −2 ) did not decrease the number of juvenile migrants.