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Variation in fish condition between Atlantic cod (Gadus morhua) stocks and implications for their management

Rätz, Hans-Joachim; Lloret, J.; Casey, John; Aglen, Asgeir; Schopka, S.A.; O’Brien, Loretta; Steingrund, P.
Working paper
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V0700.pdf (314.7Kb)
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http://hdl.handle.net/11250/100467
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
A comparative analysis of the fish condition (Fulton’s K) of 11 cod stocks in the North Atlantic in relation to the

temperature of their habitat and their reproductive potential is presented. It is shown that the cod stocks in the North

Atlantic display different levels of mean condition, which are partly due to the different temperature regimes of their

habitats. Cod stocks living in colder waters, e.g. Southern Gulf of St Lawrence, Greenland and Grand Bank cod stocks,

were more poorly-conditioned than cod stocks living in warmer waters, e.g. North Sea and Irish Sea.

The a-coefficient obtained from a standardised Ricker’s recruitment-spawning stock biomass (SSB) relationship

represents the function’s slope at the origin and was defined as an indicator for the recruitment potential of a given

stock. The a-coefficients were found to be correlated with the mean condition factors of the stocks in 9 of the 11 cod

stocks analysed. This indicates that stocks consisting of poorly-conditioned individuals appear to be very susceptible

to reduced recruitment at low SSB, while the stocks which consist of well conditioned fish seem to behave more robust

with a higher probability of good recruitment at low SSB. The positive effect of the cod condition on their reproductive

potential generally implies that the well-conditioned stocks in the Northeast Atlantic can sustain higher exploitation rates

than the poorly-conditioned stocks in the Northwest Atlantic. This implication is confirmed by a positive relationship

between the estimated biological management reference points Fmed and the mean cod condition factors of the stocks.
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ICES
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ICES CM documents
2000/V:07

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