Factors Affecting the Performance of a Survey Bottom Trawl

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Summary of Literature Search (contd.) • Doubleday and Rivard. 1981. Bottom Trawl Surveys. Can. Spec. Pub. 58. 273 p. – Sampling Techniques: • Fish Catching Process • Catch Variability due to Variations in Trawl Behavior • Factors Affecting Variability of Trawl Surveys
Results and Conclusions: (Doubleday and Rivard) • Trawl is a quantitative sampling tool that must be calibrated, but even so there will be variable catch efficiency. • Measurement variability due to vessel, fishing gear and environmental factors. • Impossible to separate variability due to fish distributions from measurement error.
Page 1 and 2: Factors Affecting the Performance o
Page 3 and 4: Presentation Outline • Factors af
Page 5 and 6: General Questions Related to Bottom
Page 7 and 8: Measures of Bottom Survey Trawl Per
Page 9 and 10: Goal with Regard to Bottom Survey T
Page 11 and 12: Bottom Trawl System: Towing Vessel,
Page 13 and 14: No Offset in Warp Length
Page 15 and 16: 6 foot Offset in Warp Length
Page 17: Results of Literature Search • Ov
Page 21 and 22: Results and Conclusions: (Lauth, Sy
Page 23 and 24: Results and Conclusions: (DeAlteris
Page 25 and 26: Question Addressed: (Kondratev) •
Page 27 and 28: Results and Conclusions: (Kondratev
Page 29 and 30: Results of Canvass of Professionals
Page 31 and 32: Advice and Experience of Experts
Page 37: Summary and Conclusions (ll) • Ge

Factors Affecting the Performance of a Survey Bottom Trawl

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