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Long term changes of growth and maturation in the Norwegian spring spawning herring

Toresen, Reidar
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URI
http://hdl.handle.net/11250/107567
Date
1990
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  • Symposium proceedings [168]
Abstract
Two periods with great differences i n year class abundance and

recruitment where chosen for growth and maturation studies, 1950 -

1960 and 1973 - 1983. In the first period, the mean year class

strength at 3 years was 6.8 x 109 individuals while in the second

period it was 0.4 x 109 ind. The growth in each period as observed by

the length at age, is compared to the year class strength and the

abundance of the stock at the time. Variations in growth are observed

and before maturation strong year classes has remarkably less growth

than weak year classes. The latter period is therefore characterized

by far better growth, especially in the early years of life , than the

former. According to growth rates of the various year classes, the age

at maturity is substantially higher in the first period than i n the

latter. However, the length at maturity is found to be fairly constant

showing the maturation to be size dependent rather than dependent on

the age.
Description
Biology and fisheries of the Norwegian spring spawning herring and blue whiting in the Northeast Atlantic. Proceedings of the fourth Soviet-Norwegian Symposium. Bergen, 12 - 16 June 1989.
Series
PINRO-IMR Symposium
4

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