Evaluating off-bottom sweeps of a U.S. West Coast groundfish bottom trawl: Effects on catch efficiency and seafloor interactions

Lomeli, Mark J.M.; Wakefield, W. Waldo; Herrmann, Bent

doi:10.1016/j.fishres.2019.01.016

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i

Evaluating off-bottom sweeps of a U.S. West Coast groundfish bottom trawl: Effects on catch efficiency and seafloor interactions

2019
By Lomeli, Mark J.M. ; Wakefield, W. Waldo ; Herrmann, Bent
Source: Fisheries Research, 213, 204-211

[PDF-1.31 MB]

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Journal Title:

Fisheries Research
Personal Author:

Lomeli, Mark J.M. ; Wakefield, W. Waldo ; Herrmann, Bent

Lomeli, Mark J.M. ; Wakefield, W. Waldo ; Herrmann, Bent Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) Less -
Description:

In the U.S. West Coast groundfish bottom trawl fishery, lengthy sweeps (>85 m) that maintain seafloor contact are traditionally used. While these sweeps are effective at herding groundfishes, their bottom tending characteristics increase the potential to cause seafloor disturbances, and injury and unobserved mortality to benthic organisms. In this study, we examined if changing from conventional to modified sweeps (with sections elevated 6.5 cm off bottom) would affect catch efficiency of target groundfishes and seafloor interactions. We used a DIDSON imaging sonar to observe how each sweep configuration interacted with the seafloor. An altimeter was periodically placed on the modified sweep to measure height off bottom. Results detected no significant catch efficiency effect of changing from conventional to modified sweeps. The DIDSON and altimeter data showed the modified sweeps exhibit elevated sections where infaunal and lower-profile epifaunal organisms can pass under without disturbance. Results demonstrate that seafloor interactions can be substantially reduced using elevated sweeps in this fishery without impacting catch efficiency. Further, findings from this research could be potentially applicable to other fisheries nationally and internationally.
Keywords:

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Aquatic Science
Source:

Fisheries Research, 213, 204-211
DOI:

https://doi.org/10.1016/j.fishres.2019.01.016
ISSN:

0165-7836
Format:

PDF
Publisher:

Elsevier BV
Document Type:

Journal Article
Funding:

Grant no. NA17NMF4720267
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Accepted Manuscript
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Library
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urn:sha-512:705322824269e2d92a9f6b12854726dc3fb2c08cc12b7a6a4de9c30fac511ed387de77deaae69676076ec068f0694ebd5793c9cdefeeaf140fd35e60f3d3dce5
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Evaluating off-bottom sweeps of a U.S. West Coast groundfish bottom trawl: Effects on catch efficiency and seafloor interactions

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