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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...

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Bibliographic Details
Main Authors: Lm. J. Armstrong, P. Connolly, R. D. M. Nash, M. G. Pawson, E. Alesworth, P. J. Coulahan, M. Dickey-collas, S. P. Milligan, M. F. O’neill, P. R. Witthames, L. Woolner, M. J. Armstrong, M. Dickey-collas Agricultural, Environmental Sciences, Centre Environ
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2000
Subjects:
Key words
egg production method
cod
plaice
sole
Irish Sea
spawning stock
Gadus morhua
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.626.4693
http://icesjms.oxfordjournals.org/content/58/1/183.full.pdf
Description
Summary: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.

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