Relationship between abundance, growth, egg size and fecundity in a landlocked population of longfin smelt, Spirinchus thaleichthys
作者： P. Chigbu , T. H. Sibley
DOI: 10.1111/J.1095-8649.1994.TB01282.X
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摘要: Sixteen year-classes of longfin smelt, Spirinchus thaleichthys, show a consistent pattern alternating year-class strength between even (strong) and odd (weak) years. A recent (1989) grew as well as, if not better than, the late 1960s year-classes. However, fish in (1988 1990) were significantly smaller size then 1966 1968 cohorts. Associated with this reduction growth is decline fecundity. Fecundity smelt was also than early 1960s. Mean egg diameter gonadosomatic index statistically different 1988 1989 but relative fecundity higher for 1989, suggesting reproductive investment year-class. Reduction associated traits considered to result from abundance mysids, preferred prey species.
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