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Lifetime consequences of variable 0 year group length in riverine populations of chub Leuciscus cephalus (L.)
Author(s) -
Bolland J. D.,
Britton J. R.,
Cowx I. G.
Publication year - 2007
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.1095-8649.2007.01650.x
Subject(s) - leuciscus , biology , population , growing season , ecology , zoology , fishery , fish <actinopterygii> , demography , sociology
The fork length ( L F ) of individual chub Leuciscus cephalus in English riverine populations at the end of their first growth season varied considerably, ranging from <25 to >70 mm. This had a significant influence on the subsequent growth of individuals over their lifetime. Chub of small L F at age 1 year generally produced smaller annual growth increments throughout life than those of longer L F at age 1 year, although they had the potential to attain greater ultimate L F . This variability in L F at age 1 year resulted, at least in part, from multiple spawning events over a protracted period, that caused variation in the growing seasons for 0 year group chub of the same year class. Since the adult population contained individuals that only attained L F of <25 mm at the end of their first growing season, it is possible that L F at age 1 year may not be such a major precursor to strong chub recruitment as previously thought.