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Striped red mullet - Northern Tunisia, Gulf of Hammamet, Gulf of Gabes
Fact Sheet Title  Fact Sheet
Stock status report 2007
Striped red mullet - Northern Tunisia, Gulf of Hammamet, Gulf of Gabes
Fact Sheet Citation  
Mullus surmuletus - Northern Tunisia, Gulf of Hammamet, Gulf of Gabes
Owned byGeneral Fisheries Commission for the Mediterranean (GFCM) – ownership
ident Blockident Blockdisplay tree map
 
Species List:
Species Ref: en - Surmullet, fr - Rouget de roche, es - Salmonete de roca, ar - طرستوج الصّخرة، سمك السّلطان سليمان الصّخريّ, zh - 纵带羊鱼
ident Block Striped red mullet - Northern Tunisia, Gulf of Hammamet, Gulf of Gabes
Aq Res
Biological Stock: No         Value: Sub-Regional
Reference year: 2006
 
 
Aq Res State Trend
 

The global fishing mortality rates of the northern and eastern stocks are low; while for the southern stocks, they are moderate. The exploitation’s profile of north and east trawler and coastal fleet is orientated to mature fish; however, the southern trawlers catch mainly an important fraction of juveniles.
Northern and eastern stocks
Aq Res State Trend Entry
Aq Res State Trend Entry Aq Res State Trend Entry
Aq Res State Trend EntryLow fishing mortalityNo or low fishing mortality
Aq Res State Trend EntryPre-exploitation biomass or high abundance
Aq Res State Trend Entry
Aq Res State Trend EntryUnderexploited


Southern stock
Aq Res State Trend Entry
Aq Res State Trend Entry
Aq Res State Trend EntryModerate fishing mortality
Aq Res State Trend EntryPre-exploitation biomass or high abundance
Aq Res State Trend Entry
Aq Res State Trend EntryModerately exploited
Habitat Bio
Climatic Zone: Temperate.   Bottom Type: Hard bottom.   Depth Zone: Shelf (50 m - 200 m).   Horizontal Dist: Neritic; Littoral.   Vertical Dist: Demersal/Benthic.  

Geo Dist
Geo Dist: Shared between nations

Water Area Overview
Spatial Scale: Sub-Regional

Water Area Overview
Aq Res Struct
Biological Stock: No



Two independent stocks of red mullet in Tunisia were identified: one relative to the Northern and Eastern and the other to the Southern part.


Exploit
 

Information on Operational Units exploiting this resource will be soon available at the following link:
GASs 12, 13, 14 Striped Red Mullet (Mullus surmuletus)
Bio Assess
 
Assess Models
Type:  Size-structured
Length cohort analysis (LCA), Yield per recruit (Y/R)

The present study deals with demographic analysis of Mullus surmuletus in Tunisia by means of length composition of capture applied to the inshore trawl fishing from 2003 to 2005. The analysis of pseudo-cohort method is used


Results

  • The global fishing mortalities rate of the northern and eastern stocks were weak; wile for the southern stocks, it is moderate. The exploitation’s profile of north and east trawler and coastal fleet is orientated to mature fish; however , the southern trawlers catch essentially a juveniles before reaching the optimal size exploitation.
  • The increase of actual effort would lead to a long-term a positive effect in global yield for the northern and eastern stocks. As well, this increase of effort would have a negative effect on the spawning biomass;
  • For the global stock the progressive decrease of actual fishing effort at 50 % would lead to on long term important amelioration in spawning biomass; while, a negative effect in landings.
  • The northern an eastern stock of striped mullet are underexploited, while, the southern stocks are in optimum exploitation.

Sci Advice

For management considerations

SCSA endorsed the WG management advice and recommendations on the striped red mullet (Mullus surmuletus) in GSAs 12, 13 and 14.


Management
 
Advice

Scientific advices for management consideration formulated by SCSA have been adopted by SAC.

Advices and comments by SAC
  • Not to increase the fishing effort
  • Provide fishing effort level

Sources
 
“Stock assessment of striped red mullet (Mullus surmuletus) in the Geographical Sub-Areas 12, 13, 14. In:Report of 9th Meeting of the Sub-Committee on Stock Assessment (SCSA), Working Group on Demersals” . H. Gharbi, Sadok Ben Meriem and M. Cherif. FAO-GFCM Athens, Greece, 10-12 September, 2007 FAO Click to openhttp://www.icm.csic.es/rec/projectes/scsa/Demersals_2007/WGD_2007.pdf


“Report of the tenth session of the SCIENTIFIC ADVISORY COMMITTEE” FAO-GFCM Nicosia, Cyprus, 22–26 October 2007 2007 FAO Click to openhttp://www.fao.org/tempref/docrep/fao/010/a1579b/a1579b00.pdf
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