Fisheries and Resources Monitoring System

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Benguela hake - Angola
Fact Sheet Title  Fact Sheet
CECAF Scientific advice 2020
Benguela hake - Angola
Fact Sheet Citation  
Merlu (Merluccius polli) - Angola
Owned byFood and Agriculture Organization (FAO) – ownership
ident Blockident Blockdisplay tree map
 
Species List:
Species Ref: en - Benguela hake, fr - Merlu d'Afrique tropicale, es - Merluza de Benguela, ru - Мерлуза бенгальская

Fishery Indicators
Production: Catch
ident Block Benguela hake - Angola
Aq Res
Biological Stock: Yes         Value: National
Management unit: No        Reference year: 2016
 
 
Aq Res State Trend
Aq Res State Trend
Aq Res State Trend
Aq Res State TrendUncertain/Not assessed
Aq Res State TrendUncertain/Not assessed
Aq Res State Trend
Aq Res State TrendUncertain/Not assessed
Habitat Bio
Climatic Zone: Tropical.   Depth Zone: Shelf (50 m - 200 m); Slope (200 m - 1000 m).   Vertical Dist: Demersal.  

Geo Dist
Geo Dist: National

Water Area Overview
Spatial Scale: National

Water Area Overview
Aq Res Struct
Biological Stock: Yes


Only Angola provided some data. The Working Group only considered one stock.
Exploit
 

CATCH: Catches are fairly stable between 1995 and 2000. They then increased between 2001 and 2004 from around 1 000 to 6 000 tonnes and another stability are observed from 2005 to 2010 around 4 458 tonnes. Thereafter, catches increased up to 11 000 tonnes over the last years (Table 5.11.3a and Figure 5.11.3a).
CPUE: The CPUE shows a stable trend between 2004 and 2010, before increasing in recent years and as other resource exploited in Angola waters, following the same pattern of the catches (Table 5.11.3b and Figure 5.11.3b).
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 370tonnes1995
Catch 456tonnes1996
Catch 360tonnes1997
Catch 1032tonnes1998
Catch 516tonnes1999
Catch 360tonnes2000
Catch 1034tonnes2001
Catch 1207tonnes2002
Catch 2518tonnes2003
Catch 6107tonnes2004
Catch 4308tonnes2005
Catch 4433tonnes2006
Catch 4183tonnes2007
Catch 4756tonnes2008
Catch 4393tonnes2009
Catch 4675tonnes2010
Catch 3030tonnes2011
Catch 9525tonnes2012
Catch 14252tonnes2013
Catch 10145tonnes2014
Catch 12642tonnes2015
Catch 12180tonnes2016
Bio Assess
 

Assessment year: 2017
The CECAF Working Groups have adopted the following Biological Reference Points (BRPs):
- Limit Reference points: BMSY and FMSY
- Target Reference Points: B0.1 and F0.1
Stock status is assigned based on current estimates of fishing mortality (Fcur) and biomass (Bcur) relative to these target and limit reference points (Bcur/BMSY, Fcur/FMSY, Bcur/B0.1, Fcur/F0.1). The results from the stock assessment of this stock are found under the “Biological state and trend section”.
Data

The Working Group used the total catches of Merluccius polli and the CPUE of the industrial trawlers of Angola.
Assess Models
Type:  Biomass-aggregated
Schaefer dynamic production model

The Schaefer dynamic production model, implemented on an Excel spreadsheet or worksheet was used to assess the state of the stocks and fisheries of Merluccius polli by the Working Group. This model is described in detail in FAO, 2012.
Results

The model doesn’t fit because the data was showing too many inconsistencies (FAO, 2020).
DISCUSSION: The Nansen survey abundance index shows two different periods: from 1994 to 2007, when the biomass was higher, and the period 2009–2016, when the biomass showed a decreasing trend. No data available to the Working Group. 
Sci Advice

Considering the results of last assessment in 2011, the stock was fully exploited. The Working Group recommends that fishing mortality should not be increased and the stock should be well monitored (FAO, 2020).
Management
Management unit: No
Sources
 
FAO. 2019. Report of the FAO/CECAF Working Group on the Assessment of Demersal Resources – Subgroup South. Libreville, Gabon, 6–15 September 2017/Rapport du Groupe de travail sur l’évaluation des ressources démersales – Sous-groupe Sud. Libreville, Gabon, 6–15 septembre 2017. CECAF/ECAF series/ FAO/COPACE COPACE/PACE séries no.18/79. Rome.  Click to openhttp://www.fao.org/3/ca2739b/ca2739b.pdf
FAO. 2019. Fishery Committee for the Eastern Central Atlantic, Report of the eighth session of the Scientific Sub-Committee, Abidjan, Côte d’Ivoire, 23–26 October 2018 / Comité des pêches pour l’Atlantique Centre-Est Rapport de la huitième session du Sous-Comité scientifique, Abidjan, Côte d’Ivoire, 23–26 octobre 2018. FAO Fisheries and Aquaculture Report / FAO Rapport sur les pêches et l’aquaculture No. 1265. Rome.  Click to openhttp://www.fao.org/3/ca5623b/ca5623b.pdf
FAO. 2020. Report of the Twenty-Second Session of the Fishery Committee for the Eastern Central Atlantic, Libreville, Gabon, 17–19 September 2019. Rapport de la vingt-deuxième session du comité des pêches pour l’Atlantique centre-est, Libreville, Gabon, 17–19 septembre 2019. FAO Fisheries and Aquaculture Report / FAO, Rapport sur les pêches et l’aquaculture No. 1303. Rome.  Click to openhttp://www.fao.org/3/ca8000b/CA8000B.pdf
Bibliography
 
All references to figures, tables and bibliography in the text are found within the source of information.
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