The ICES International Bottom Trawl Survey (IBTS) quarter 3 (Q3) data, Dutch Beam Trawl Survey (BTS) Q3 data, and ICES stock assessment data were analysed to model the catchability of each 1-cm size class of demersal fish caught in the Q3 IBTS. Estimates of catchability were generally low, suggesting that raw trawl survey density data seriously underestimated actual densities.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:493490 |
| Date | January 2008 |
| Creators | Fraser, Helen M. |
| Publisher | University of Aberdeen |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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