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Diurnal variation models of bottom trawl survey catches parameterised by using commercial CPUE data

Johnsen, Espen
Working paper
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URI
http://hdl.handle.net/11250/106605
Date
2004
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Original version
This report is not to be cited without prior reference to the author  
Abstract
Introduction: Diurnal variation is observed in almost all marine surveys and can cause biased abundance and length frequency estimates. Symmetric logistic

models developed by Hjellvik et al. (2001) were utilized to investigate diurnal variation in catch rates of hake (Merluccius spp.) of trawlers for

the period 1997-2002 and of hake surveys (1990-2003) in Namibian waters. The large numbers of commercial tows have a very good

geographical, seasonal and temporal resolution that enabled us to study the influence of various explanatory variables on diurnal fluctuation

model parameters. These results were thereby used to facilitate the modelling of diurnal variation in Namibian hake trawl survey catches.
Publisher
ICES
Series
ICES CM Documents;2004/R:41

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