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The relationship between smolt density and fry density in salmonids
Author(s) -
Elliott J. M.
Publication year - 1996
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.1095-8649.1996.tb01500.x
Subject(s) - salmo , biology , density dependence , population density , brown trout , fishery , population , fish <actinopterygii> , demography , sociology
If the Ricker stock–recruitment model describes the relationship between egg density and survivor density at different stages of the life cycle, then the relationship between smolt density and fry density is not simple. Using data from a long‐term study (1966–1990) of a sea trout population Salmo trutta , the relationship between density of potential smolts and fry densities in late M ay/early June or late August/early September is shown to be a reflexed curve with zero origin, so that there are two smolt densities for each fry density. A linear relationship is obtained only when the exponential parameter in the Ricker model is constant for the different life Stages.