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ICES Journal of Marine Science: Journal du Conseil 2001 58(1):183-203; doi:10.1006/jmsc.2000.1001
© 2001 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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An application of the annual egg production method to estimate the spawning biomass of cod (Gadus morhua L.), plaice (Pleuronectes platessa L.) and sole (Solea solea L.) in the Irish Sea

M. J. Armstronga,, P. Connollyb, R. D. M. Nashd, M. G. Pawsonf, E. Alesworthe, P. J. Coulahang, M. Dickey-Collasa, S. P. Milliganf, M. F. O'Neillc, P. R. Witthamesf and L. Woolnerf

a Agricultural and Environmental Sciences Division, Department of Agriculture and Rural Development Newforge Lane, Belfast, BT9 5PX, Northern Ireland
b Marine Fisheries Services Division, the Marine Institute Abbotstown, Dublin, 15, Ireland
c Dept of the Marine and natural Resources, Sea Fisheries Division Leeson Lane, Dublin, 2, Ireland
d University of Liverpool, School of Biological Sciences, Port Erin Marine Laboratory Port Erin, Isle of Man
e University of Liverpool
f Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory Lowestoft, Suffolk, NR33 0HT, England
g Dept of Environmental Resource Management, Faculty of Agriculture, University College Dublin Dublin, 4, Ireland

Correspondence to: M. J. Armstrong, e-mail: mike.armstrong{at}dardni.gov.uk

The spawning biomass of cod (Gadus morhua), plaice (Pleuronectes platessa) and sole (Solea solea) in the Irish Sea in 1995 was estimated by means of the annual egg production method (AEPM). The area surveyed corresponded to ICES assessment area VIIa. This paper describes the sampling design, methods of analysis, estimates of biomass, and sources of error in the estimates. Estimates are also presented for spatially separated spawning grounds of cod and plaice in the eastern and western Irish Sea, the first time that information at this scale has been available. The AEPM estimates of spawning biomass of cod, sole and plaice exceeded the corresponding estimates from Virtual Population Analysis of data from commercial fisheries and trawl surveys by factors of 2.3, 2.7 and 4.3 respectively. The sources of these large discrepancies are not yet resolved.

Keywords: egg production method, cod, plaice, sole, Irish Sea, spawning stock biomass

Received 6 September 1999; accepted 1 September 2000.


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