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The relationship between a summer fry (0+) abundance index, derived from semi‐quantitative electrofishing, and egg deposition of Atlantic salmon, in the River Bush, Northern Ireland
Author(s) -
Crozier W. W.,
Kennedy G. J. A.
Publication year - 1995
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.1095-8649.1995.tb06029.x
Subject(s) - electrofishing , biology , fishery , abundance (ecology) , stock (firearms) , stock assessment , ecology , fishing , mechanical engineering , engineering
Atlantic salmon survival in the R. Bush (N. Ireland) from egg to summer 0+ was inversely density‐dependent on egg deposition ( P <0.05). A stock‐recruitment relationship derived from egg deposition and summer 0+ abundance index data was compared to that derived from adult and smolt counts based on total trapping. Fitted Ricker curves indicated maximum recruitment at around 2.35 million eggs and 2.46 million eggs for 0+ index and smolt count methods, respectively. Salmon 0+ abundance index data from semi‐quantitative electrofishing could be obtained with relatively little effort, and used to derive whole‐river stock‐recruitment relationships on rivers where only adult count or some other estimator of parental stock is available. The derivation and expression of spawning targets from stock/recruitment relationships is discussed with reference to the R. Bush data.