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| Fact Sheet Title Fact Sheet |
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| Northern brown shrimp - Gulf of Mexico USA waters |
 | Northern brown shrimp - USA Gulf of Mexico |
| | Data Ownership | | This document provided, maintained and owned by Food and Agriculture Organization (FAO) , is part of WECAFC Stock Status Reports data collection. |
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| ident Block | ident Block | | | | Species List: | | Species Ref: en - Northern brown shrimp, fr - Crevette royale grise, es - Camarón café norteño |
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| ident Block Northern brown shrimp - Gulf of Mexico USA waters
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| Large Marine Ecosystem Areas (LME) |
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| 5 | Gulf of Mexico |
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| Aq Res | Biological Stock: Yes
Value: National
Management unit: Yes
Reference year: 2015
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| Considered a management unit: An aquatic resource or fishery is
declared as [Fishery] Management Unit if it is
effectively the focus for the application of selected
management methods and measures, within the broader
framework of a management system. According to the FAO
Glossary for Responsible Fishing, "a Fishery Management
Unit (FMU) is a fishery or a portion of a fishery
identified in a Fishery Management Plan (FMP) relevant
to the FMP's management objectives." FMU's may be
organised around fisheries biological, geographic,
economic, technical, social or ecological dimensions ,
and the makeup and attribute of a fishery management
unit depends mainly on the FMP's management
objectives. |
| Jurisdictional distribution: Jurisdictional qualifier (e.g.
"shared", "shared - highly migratory") of the aquatic
resource related with its spatial distribution. |
| Environmental group: Classification of the aquatic
resource according to the environmental group (e.g.
pelagic invertebrate, or demersal fish) to which the
species belong. |
| Reference Year: The Reference Year is the last year considered in the stock assessment and/or fishery status. |
| | | | | | Aq Res State Trend The most recent assessment for northern brown shrimp (Farfantepenaeus aztecus) in USA waters of the Gulf of Mexico (Hart, 2016a) indicated that the resource was not overfished nor undergoing overfishing. Habitat Bio Climatic Zone: Tropical. Bottom Type: Soft bottom muddy or muddy-sand. Depth Zone: Coastal - Shallow waters, inshore (0 m - 50 m). Horizontal Dist: Littoral. Vertical Dist: Demersal/Benthic. Geo Dist Geo Dist: National Water Area Overview  | | Water Area Overview Northern brown shrimp - Gulf of Mexico USA waters
| Large Marine Ecosystem Areas (LME) | 5: Gulf of Mexico |
| | | | | | Water Area Overview
| | | | | | Water Area Overview |
Water Area OverviewNorthern brown shrimp - Gulf of Mexico USA waters Aq Res Struct Biological Stock: Yes Exploit Landings of Northern brown shrimp has been fluctuating around 51 000 tonnes over the last decade and showed a decrease to 48 288 tonnes in 2016 after a recent peak in 2015. After three years (2013-2015) of stable landings around 42 000 tonnes. Bio Assess Uncertainty: Low Data Data up to 2015. Landings of Northern brown shrimp in US Gulf of Mexico represent approximately 78% of total landings in FAO Area 31. The model was parameterized with data from 1984 through 2015. Two years of “dummy” data were entered into the model before the actual 1984 data to allow for a burn in period. This burn in period facilitated the development of recruitment deviations or cycles which were initiated prior to the actual starting year data being called into the model. The Stock Synthesis assessment model was parameterized with brown shrimp commercial catch data including; directed fishing effort by year and month, i.e., effort for those trips where >90 percent of the catch were brown shrimp, used to calculate monthly CPUE. In addition the model included total catch and catch by size, i.e., size composition data consisting of count of numbers of shrimp per pound; for statistical zones 7-21 from January 1984 through December 2015. Assess Models Type: Age-structured Stock Synthesis Stock Synthesis requires the model to be initialized with approximations for certain parameters which are then estimated by the model in preset phases. These initial approximations scale the parameters to biologically reasonable values, and facilitate the evaluation of parameters estimated in subsequent phases. Results Fishing Mortality - Stock Synthesis outputs F values by age and year. The model is also parameterized with two fleets, an offshore and an inshore fleet. The annual fishing mortality rate for 2015 is estimated to equal 1.55 (Figure 4.6.1). - Steepness, Spawning Biomass, and Recruitment - The model estimated a steepness value of about 0.99. Spawning biomass and recruitment at the end of the 2015 fishing season were 74.4 million pounds and 25.8 billion individuals respectively (Figures 4.7.1 and 4.7.2). - CONCLUSIONS - The Stock Synthesis model developed provides outputs for new overfished and overfishing definitions for the Gulf of Mexico brown shrimp fishery. This assessment revealed the fishery is not overfished nor undergoing overfishing. Spawning biomass and recruitment have fluctuated, decreasing in recent years while fishing mortality (F) increased during the later portion of the time series. Management Management unit: Yes Sources FAO. Western Central Atlantic Fishery Commission. 2019. Review of the state of fisheries and fisheries resources in the WECAFC region. Meeting document WECAFC/SAG/IX/2018/3 of the ninth session of the Scientific Advisory Group, Christ Church, Barbados, 19-20 November 2018.  http://www.fao.org/fi/static-media/MeetingDocuments/WECAFC/SAG2018/3e.pdfHart, R.A. 2016a. Stock Assessment Update for Brown Shrimp (Farfantepenaeus aztecus) in the U.S. Gulf of Mexico for 2015. NOAA Fisheries, Southeast Fisheries Science Center, Galveston Laboratory, Galveston, TX. 19 pp. Bibliography Hart, R.A. 2015a. Stock Assessment Update for Brown Shrimp (Farfantepenaeus aztecus) in the U.S. Gulf of Mexico for 2014. NOAA Fisheries, Southeast Fisheries Science Center, Galveston Laboratory, Galveston, TX. 19 pp. http://archive.gulfcouncil.org/council_meetings/BriefingMaterials//BB-04-2016/D%20-%205(a)%20Brown%20Assess_Rpt_2015_CPT.pdfFAO. Western Central Atlantic Fishery Commission/FAO Commission des pêches pour l’Atlantique Centre-Ouest/FAO Comisión Central de Pesca para el Atlántico CentroOccidental. 2019. Report of the ninth session of the Scientific Advisory Group, Christ Church, Barbados, 19-20 November 2018. Rapport de la neuvième session du Groupe scientifique consultatif, Christ Church, Barbade, 19-20 Novembre 2018. Informe de la octava sesión del Grupo Asesor Científico, Christ Church, Barbados, 19-20 de Noviembre de 2018. FAO Fisheries and Aquaculture Report/Rapport sur les pêches et l’aquaculture/Informe de Pesca y Acuicultura. No. 1266. Bridgetown, 156 pp. http://www.fao.org/3/ca4776t/ca4776t.pdfAll references to figures, tables and bibliography in the text are found within the source of information. |
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