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Demonstration of maternal effects of Atlantic cod: Combining the use of unique mesocosm and novel molecular techniques – A new EU-project

Svåsand, Terje; Ajiad, Adnan Mosa; Dahle, Geir; Jakobsen, Tore; Kjesbu, Olav Sigurd; Moksness, Erlend; Otterå, Håkon; Solemdal, Per; Thorsen, Anders
Working paper
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R0800.pdf (137.1Kb)
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http://hdl.handle.net/11250/100635
Utgivelsesdato
2000
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Originalversjon
This report is not to be quoted without prior consultation with the General Secretary.  
Sammendrag
One of the effects of fishing is a reduction in average age and size in exploited fish stocks,

leading to an increasing proportion of recruit spawners in the stock. Current management

practice assumes equal viability of offspring from first time spawners and from repeat

spawners, despite the fact that that first time spawners often produce smaller eggs than older

spawners. The aim of this EU-project is to follow offspring from families of first time

spawning and older cod, reared under identical and semi-natural conditions in marine

enclosures (mesocosms). The parental origin of the larvae is identified using microsatellite

DNA methodology. The advantage of this approach, compared to traditional laboratory

rearing, is that rearing conditions are close to natural conditions, and all larvae are reared in

the same environment. This eliminates the tank-to-tank variability often observed in

traditional rearing experiments. The fish are reared from hatching, through the larval and

juvenile stages, until sexual maturity. Growth rates, survival and nutritional condition will be

measured using methods such as RNA/DNA ratio and otolith micro increment analysis. The

results will be related to parental origin and quality measures of the eggs. It is intended to

incorporate the results into management models for improvement of fishery management

strategies. In this paper we will focus on a description of the project.
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ICES
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ICES CM documents
2000/R:08

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