Factors Affecting the Performance of a Survey Bottom Trawl

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Advice and Experience of Experts • Gary Loverich of Ocean Spar, fomerly NETS, and NMFS. (contd) – Results of model tests suggest up to a 5.5% offset would not result in a catch reduction. – Auto-trawl winches often result in a 1-2% offset required to balance warp tension. – Other operational factors result is a skewed net.
Advice and Experience of Experts • Gary Loverich of Ocean Spar, fomerly NETS, and NMFS. (contd) – Conclusion: “looking at all the evidence available to me, I believe that a warp differential on the order 5% would not greatly impact the cumulative catch of the Yankee 36 used aboard the R/V Albatross.”
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 and 18: Results of Literature Search • Ov
Page 19 and 20: Results and Conclusions: (Doubleday
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 33: 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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