EIMWTEcho Integration-Midwater Trawl
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References in periodicals archive ?
EIMWT surveys have been carried out on a 24 hour per day basis.
With the exception of 1979, the demersal survey biomass estimate of age 1 fish has always been higher than that obtained by EIMWT. Midwater estimates of age 2 and 3 pollock are generally higher than in the demersal survey, but the reverse is true for most ages greater than 3 in the majority of years.
Extrapolation of the echo integration results to the bottom increases the overall EIMWT estimate by a relatively small amount.
Since the population ageing process is gradual, one might expect the size dependent phenomena discussed above to have influenced the annual bottom trawl (and triennial EIMWT) results gradually over a period of years.
As we recognize the various problems associated with bottom trawl and EIMWT surveys we must address them in a systematic manner.