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Influence of seasonal changes in relative liver size, condition, relative gonad size and variability in ovarian development in multiple spawning fish species used in environmental monitoring programmes
Author(s) -
Galloway B. J.,
Munkittrick K. R.
Publication year - 2006
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.1095-8649.2006.01249.x
Subject(s) - biology , fundulus , gonad , fishery , zoology , ovary , ecology , fish <actinopterygii> , anatomy , endocrinology
Basic biological information was collected to assist in understanding the biology of selected small‐bodied fishes for use in environmental monitoring programmes. Gonado‐somatic index ( I G ) and hepato‐somatic index ( I H ) profiles of female blacknose dace Rhinichthys atratulus , mummichog Fundulus heteroclitus and golden shiner Notemigonus crysoleucas were similar, decreasing gradually during the spawning season. I G and I H profiles of female northern redbelly dace Phoxinus eos peaked twice suggesting oocyte recruitment was continuous throughout the spawning season. Regressions of ovary mass to adjusted body mass ( M A ) were more variable in dace relative to the other fish species. For female blacknose dace, variability in the relationship between ovary mass and M A was minimized by selecting either 2 year‐old fish and fish that weighed 2–4 g.