Untrawlable Bottom in Shrimp Statistical Zones of the Northwest Gulf of Mexico

Link , Jason (1997) Untrawlable Bottom in Shrimp Statistical Zones of the Northwest Gulf of Mexico. Marine Fisheries Review, 59(4), pp. 33-36.

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Official URL: http://spo.nmfs.noaa.gov/mfr594/mfr5945.pdf

Abstract

The Gulf of Mexico Fisheries Management Council tasked the National Marine Fisheries Service with determining the extent, if any, of loss oft rawlable bottom in the Gulf of Mexico based upon fishing industry concerns. There are approximately 31 million hectares in the 21 shrimp statistical zones in the Gulf, approximately 23 million hectares of waters that are <35 fathoms (where most shrimp trawling effort occurs), and approximately 11 million hectares in zones 10-21, <35f athoms, which were examined. There are 31,338 known hangs, snags, artificial reefs, hazards to navigation, oil rigs, and similar obstructions which cause trawling to be unfeasible in these zones. There are several refuge (i.e. untrawlable) areas associated with the Alabama Artificial Reefs. Conservatively assuming 1 hectare for each known obstruction, coupled with the known area of each refuge, the estimate of total untrawlable bottom in zones 10-21 less than 35 fathoms in the Gulf is 185,953 hectares, or roughly 1.7% of this total trawlable area. Sensitivity analysis demonstrated the robustness of this assumption, with a range of 0.3-4.3% possible. In specific shrimp zones, untrawlable area is much less than 1% except in zones 10 (26%) and 11(2.5%), both of which possess a refuge. Other than the implementation periods of these refugia, no temporal trends were detectable with respect to the amount of untrawlable bottom.

Item Type: Article
Title: Untrawlable Bottom in Shrimp Statistical Zones of the Northwest Gulf of Mexico
Personal Creator/Author:
CreatorsEmail
Link , Jason
Refereed: Yes
Journal or Publication Title: Marine Fisheries Review
Volume: 59
Number: 4
Page Range: pp. 33-36
Date: 1997
ISSN: 0090-1830
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Management
Item ID: 9814
Depositing User: Patti M. Marraro
Date Deposited: 16 Aug 2012 14:27
Last Modified: 16 Aug 2012 14:27
URI: http://aquaticcommons.org/id/eprint/9814

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