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Lifetime consequences of variable 0 year group length in riverine populations of chub Leuciscus cephalus (L.)

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Abstract:

The fork length (LF) 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 LF at age 1 year generally produced smaller annual growth increments throughout life than those of longer LF at age 1 year, although they had the potential to attain greater ultimate LF. This variability in LF 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 LF of <25 mm at the end of their first growing season, it is possible that LF at age 1 year may not be such a major precursor to strong chub recruitment as previously thought.

Keywords: growth; modes; multiple spawning; recruitment

Document Type: Regular Paper

DOI: https://doi.org/10.1111/j.1095-8649.2007.01650.x

Affiliations: University of Hull International Fisheries Institute, Cottingham Road, Hull, HU6 7RX, U.K.

Publication date: 2007-12-01

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