Testing of Two Selective Flatfish Sorting‐Grid Bycatch Reduction Devices in the U.S. West Coast Groundfish Bottom Trawl Fishery

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

doi:10.1080/19425120.2017.1388888

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Testing of Two Selective Flatfish Sorting‐Grid Bycatch Reduction Devices in the U.S. West Coast Groundfish Bottom Trawl Fishery

2017
By Lomeli, Mark J. M. ; Wakefield, W. Waldo ; Herrmann, Bent
Source: Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 9(1), 597–611

[PDF-1.53 MB]

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Journal Title:

Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science
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 limited-entry (LE) groundfish bottom trawl fishery, catches of stocks with restrictive harvest limits (e.g., Darkblotched Rockfish Sebastes crameri, Sablefish Anoplopoma fimbria, and Pacific Halibut Hippoglossus stenolepis) continue to hinder many fishermen’s ability to fully utilize their quota shares of more abundant flatfish stocks (e.g., Dover Sole Microstomus pacificus and Petrale Sole Eopsetta jordani). We used a recapture net to examine the size-selection characteristics of two selective flatfish sorting-grid bycatch reduction devices (BRDs), which were designed to reduce catches of Pacific Halibut and non-flatfish species while retaining target flatfishes. The two devices were identical in materials and design except that the sorting-grid dimensions differed (BRD-1: 6.4- × 25.4-cm grid size; BRD-2: 6.4- × 30.5-cm grid size). The size selectivity for rockfishes, other roundfishes, Pacific Halibut, English Sole Parophrys vetulus, and Rex Sole Glyptocephalus zachirus did not differ significantly between the two designs. However, for 53–58-cm TL Arrowtooth Flounder Atheresthes stomias, 39–53-cm TL Dover Sole, and 36–49-cm TL Petrale Sole, BRD-1 retained significantly higher proportions of these length-classes than did BRD-2. Combined, the mean flatfish retention by weight (not including Pacific Halibut) was 89.3% (95% confidence interval [CI] = 87.1–91.5%) for BRD-1 and 81.7% (95% CI = 80.0–83.4%) for BRD-2. Compared to previous flatfish sorting-grid selectivity work conducted in the LE bottom trawl fishery, BRD-1 showed the ability to improve the overall retention of flatfishes while reducing catches of nontarget and constraining species.
Keywords:

[+]

Bycatches (Fisheries) Equipment And Supplies Evaluation Gear Selectivity Prevention
Source:

Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 9(1), 597–611
DOI:

https://doi.org/10.1080/19425120.2017.1388888
Document Type:

Journal Article
Funding:

Grant no. NA15NMF4270321
Place as Subject:

Pacific Coast (U.S.)
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:03b5104551855527a97f31fa5f1e9e91f71cfe287fdc7383de4b0f5fb2d406a0
Download URL:

https://repository.library.noaa.gov/view/noaa/24645/noaa_24645_DS1.pdf
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Testing of Two Selective Flatfish Sorting‐Grid Bycatch Reduction Devices in the U.S. West Coast Groundfish Bottom Trawl Fishery

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