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Statistical testing of research trawl data with implications for survey design
Fargo, J.; Tyler, A.V. (1992). Statistical testing of research trawl data with implications for survey design. Neth. J. Sea Res. 29(1-3): 97-108
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, meer
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| Abstract |
Research surveys in Hecate Strait, British Columbia were conducted between 1984 and 1989 for the purpose of mapping demersal fish and fish assemblage distributions. Three types of fish distributions are described and four species examples of these types are presented (data set 1). We then analyzed independent catch-rate data sets from research cruises (data set 2) for the selected species. Non-parametric testing and analysis of variance were used to see if density differences observed in the distribution maps were statistically significant. Results from both types of statistical analyses supported information in the distribution maps. We used these results to make decisions about which species were likely candidates for abundance monitoring. Fishing effort for the final survey design can be stratified by area and depth proportionate to target species' abundance and distribution. It is inevitable that survey design must proceed by discarding an initial broad survey plan designed to map fish distributions. A second phase should consist of a redesigned spatial sampling based on statistical testing of catch-rate data. This phase should emphasize trawl haul replication for variance calculation at the cost of reduced area coverage. |
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