Fisheries and Resources Monitoring System

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Alfonsino - Southern Indian Ocean
Marine Resource  Fact Sheet
Stock status report 2022
Alfonsino - Southern Indian Ocean
Fact Sheet Citation  
Owned bySouth Indian Ocean Fisheries Agreement (SIOFA) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Splendid alfonsino, fr - Béryx long, es - Alfonsino besugo, ar - عُنقُد طويل, zh - 红金眼鲷

Fishery Indicators
Production: Catch
Geographic extent of Alfonsino - Southern Indian Ocean
Main Descriptors
Considered a single stock: No        Spatial Scale: Regional
Management unit: No        Reference year: 2020
 
 
Biological State and Trend
State & Trend Descriptors
FIRMS
Exploitation rateLow fishing mortality
Abundance levelNot applicable

Stocks estimated to be at about 60% of their preexploitation spawning stock biomass levels, and well above the levels corresponding to MSY.
Habitat and Biology
Climatic zone: Temperate.   Depth zone: Slope (200 m - 1000 m).   Horizontal distribution: Oceanic.   Vertical distribution: Demersal.   Geo Form: Seamounts.  

Geographical Distribution
Jurisdictional distribution: High Seas Purely

Water Area Overview
Spatial Scale: Regional

Geo References
Resource Structure
Considered a single stock: No

Exploitation
 
Southern Indian Ocean Bottom trawl orange roughy fishery - SIOFA waters
Southern Indian Ocean Midwater trawl alfonsino fishery - SIOFA waters
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 4613tonnes2020
Catch 4098tonnes2019
Catch 3153tonnes2018
Catch 5248tonnes2017
Catch 4061tonnes2016
Catch 5244tonnes2015
Catch 3556tonnes2014
Catch 5406tonnes2013
Assessment
 

Assessed
Data

Total catch for each fleet, other member countries and non-member countries, with catches starting from 1977; relative abundance indices from the CPUE standardisation excluding the series for S2 (East); and length data for the S1 fleet in 2018.
Assessment Model
Type:  Age-Structured
Age-Structured Production Model

Models fitted to the CPUE series and single year of commercial catch length distribution information available.
Overall Assessment Results

Both West and East stocks are estimated to be at about 60% of their preexploitation spawning stock biomass levels, and well above the levels corresponding to MSY.
Scientific Advice

There are uncertainties around the use of CPUE data but, in the absence of other more suitable indices of abundance, the standardised CPUE data was the best information that was currently available.
Management
Management unit: No
Source of information
 
SIOFA Secretariat (2022). Overview of SIOFA Fisheries 2022. Southern Indian Ocean Fisheries Agreement (SIOFA), 50 pp.  Click to openhttps://www.siofa.org/sites/default/files/files/Overview%20of%20SIOFA%20Fisheries%202022_0.pdf
A. Brandão, D.S. Butterworth, S. Johnston (2020). Age-Structured Production Model (ASPM) assessments of the Alfonsino (Beryx splendens) resource in the SIOFA area of the Southern Indian Ocean. SIOFA Second Meeting of the Stock and Ecological Risk Assessment Working Group (SERAWG2). Working paper SERAWG-02-14. 19 March 2020.  Click to openhttps://siofa.org/sites/default/files/documents/meetings/SERAWG-02-14%20Age-Structured%20Production%20Model%20assessments%20of%20the%20Alfonsino.pdf
A. Brandão, D.S. Butterworth, S. Johnston (2020). Age-Structured Production Model (ASPM) assessments of the Alfonsino (Beryx splendens) resource in the SIOFA area of the Southern Indian Ocean. SIOFA Fifth Meeting of the Scientific Committee (SC5). Working paper SC-05-29. 19 March 2020.  Click to openhttps://siofa.org/sites/default/files/documents/meetings/SC-05-29%20Age-Structured%20Production%20Model%20assessments%20of%20the%20Alfonsino.pdf
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