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Growth rates and age distributions of capelin (Mallotus villosus) larvae in the Barents Sea investigated by otolith increment analysis

Jakobsen, Ronny A.; Pedersen, Torstein; Moksness, Erlend
Working paper
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URI
http://hdl.handle.net/11250/100617
Date
2004
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Abstract
In order to investigate age distributions and growth rates, otoliths from capelin larvae

collected from the Barents Sea during the summers 2001-2003 were analysed using otolith

microstructure analysis. Stations were selected to represent areas with different water

masses and temperature regimes. One hundred forty larvae from two stations in 2001 and

2002 and three stations in 2003 were analysed. Water temperature in the upper 50 m differed

by up to 1.5o C between stations within years. Before the otolith increment analysis, the

otoliths were coded and analysed together with otoliths from larvae of known age from bag

rearing experiments. The average change in body length was 0.33 mm per increment. Except

for 2002, there were no differences between stations within years with respect to increment

number distributions and body length distributions. Average increment width differed

between years. The larvae collected in 2002 had on average far fewer increments (average

14) than those collected in 2003 (average 24) at the same time of year. The average change

in body length per increment (0.33 mm) corresponds to bag-reared larvae that deposit about

one zone per day in the otoliths. This suggests that otolith increment analysis of capelin

larvae may provide valuable information about age distributions and growth rates in capelin

larvae. The implications of the results for assessment of factors affecting mortality rates and

drift patterns of capelin larvae will be discussed.
Publisher
ICES
Series
ICES CM documents
2004/DD:08

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