Biology and stock assessment of the Sparids, Acanthopagrus bifasciatus and Argyrops spinifer (Forsskål, 1775), in the Southern Arabian Gulf

Grandcourt, Edwin; Abdessalaam, Thabit Zahran Al; Francis, F.; Shamsi, A. T. Al

doi:10.1016/j.fishres.2004.04.006

Cited by 41 publications

(70 citation statements)

References 28 publications

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“…The results obtained in this study lead to the same conclusions obtained by Grandcourt et al (2004) who estimated the exploitation rate (0.407 · year -1 ) for A. spinifer in the southern Arabian Gulf to that at the estimated safe harvest level (0.401 · year -1 ). Also, Edwards et al (1985) indicated moderate total mortalities Z (from 0.31 to 0.61) for 11 species of fish (including A. spinifer) from the Gulf of Aden.…”

Section: Discussionsupporting

confidence: 90%

“…In fact, Grandcourt et al (2004) indicated for A. spinifer in the southern Arabian Gulf that the high juvenile retention rate (66.9%) and the discrepancies between the mean size at first capture and that which would maximize yield per recruit, suggest that the existing mesh size regulations in the trap need to be reviewed. Devaraj and Vivekanandan (1999) indicated inappropriate exploitation patterns for most of the exploited stocks in Indian fisheries; they have shown fishing mortality coefficients higher than those for natural mortality.…”

Section: Discussionmentioning

confidence: 99%

“…A. spinifer is a relatively large sparid; it is characterized by a long life span and low growth rate (Ben Meriem et al 2004, Al-Mamry et al 2009, Al-Mamry unpublished**). It attains a maximum size of 70 cm total length and age of approximately 25 years (Al-Mamry et al 2009) and is probably protogynous, undergoing a sex reversal from female to male after a certain age (Grandcourt et al 2004, McIlwain et al 2006, Al Mamry unpublished**). The species spawns each year between October and December and the size at first maturity is around 37 cm total length (Ben Meriem et al 2004, Al-Mamry et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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Fishing pattern and interactions of fleet components in the <I>Argyrops spinifer</I> (Actinopterygii: Perciformes: Sparidae) fisheries of the Arabian Sea, Oman

Al-Mamry

Meriem²,

McCarthy³

et al. 2011

Acta Icth et Piscat

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FISHING PATTERN AND INTERACTIONS OF FLEET COMPONENTS IN THE ARGYROPS SPINIFERBackground. The influx of foreign fishing vessels in the Arabian Sea, during the mid 1990's, has sparked some conflicts between artisanal and industrial fleets and raised concerns related to the resource management implications of fish stocks in the region. To address the lack of management data on the basic biology and stock assessment for targeted species, the Ministry of Fisheries Wealth in Oman initiated this study with a view to contributing towards the development of a management plan for the sustainable exploitation of the living resources of the sea in this region. Materials and methods.A database including biological parameters, length-frequency distributions and catches of king soldier bream, Argyrops spinifer (Forsskål, 1775), in Oman according to fleet (gear/technique) and region was compiled by monthly sampling in 2001 to 2002. In this study, length cohort and yield per recruit analyses were examined after simulating changes in fishing effort, in length at first capture and introducing a closed season for trawlers.Results. The results showed that: (i) the status of the stock is healthy, the average fishing mortality rate is moderate (0.1) and acts in general on the adult fraction of the stock. The fishing pattern differs, however, among fleets with some fleet components fishing, in part, for immature king soldier bream. (ii) An increase in total fishing effort would not lead to any long-term substantial increase of the catch (according the uncertainty of M value); however, the spawning stock biomass would decrease significantly. This measure affects negatively fleets that target the larger specimens. (iii) A moderate (±20%) modification of minimum length limit in catches would not affect, substantially, the sustainable yield and the spawning stock biomass. (iv) Any regulation of trawler fishing by closed season (i.e. restricted trawler activities during some seasons) would not have a significant effect on the long-term yield. Conclusion. The current pattern of exploitation and fishing effort acting on the A. spinifer stock are optimal and no changes to global fishing or length at first capture are recommended. Also, with the actual fishing effort of trawlers, no closed season is suggested. However, fleet components whose catches include some juvenile fraction should adopt more selective gear as used by the hand line fishery in the Al-Wusta region.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fishing pattern and interactions of fleet components in the <I>Argyrops spinifer</I> (Actinopterygii: Perciformes: Sparidae) fisheries of the Arabian Sea, Oman

Al-Mamry

Meriem²,

McCarthy³

et al. 2011

Acta Icth et Piscat

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“…The Sparidae is a diverse family of fish exploited in fisheries in tropical and temperate waters worldwide (Gonçalves et al 2003, Grandcourt et al 2004, Pajuelo & Lorenzo 2004, Vitale et al 2011. A. australis occupies various habitats in estuaries and coastal waters across 20 degrees of latitude (19−30°S; 2200 km) along the east coast of Australia (Kailola et al 1993, Gray et al 1996, Kingsford 2002.…”

Section: Introductionmentioning

confidence: 99%

Spatial variation in demography of an estuarine teleost: implications for population and fishery assessments

Gray¹

2015

Aquat. Biol.

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“…The results of stock assessment studies for the key species caught in the demersal fisheries of Abu Dhabi in the southern Arabian Gulf have revealed that there are a large number of juvenile fish retained by the trap fishery. More than half of the landed catches of the sparids (Acanthopagrus bifasciatus and Argyrops spinifer) for example are composed of immature fish [6]. Juvenile retention is a critical ma-nagement issue because in combination with intensive exploitation, it has resulted in both "growth overfishing" where yields are in excess of the production potential and "recruitment overfishing" where the populations have been reduced to such low levels that their reproductive capacity is impaired [7].…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of the Selectivity Characteristics of Different Juvenile Fish Escape Panel Designs for the Demersal Trap Fishery of Abu Dhabi, United Arab Emirates

Grandcourt¹,

Abdessalaam²,

Hartmann³

et al. 2011

OJMS

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The selectivity characteristics of 4 juvenile fish escape panel designs and their utility for the regulation of a multi-species demersal trap fishery were evaluated using a suite of objective socio-economic and biological criteria. The panel designs consisted of a control (type A) which had a hexagonal mesh size which was the same as that of the body of the trap (3.5 cm), a rectangular mesh (type B) which was representative of the current regulation (5.0 × 7.6 cm) and 2 escape panels with square meshes of 7.5 × 7.5 cm (type C) and 10.0 × 10.0 cm (type D). The results demonstrated that there was only a limited reduction in the proportion of juvenile fish and by-catch retained for the existing juvenile escape panel design (type B). Furthermore, as the selectivity characteristics for the key species (Epinephelus coioides and Diagramma pictum) were similar to the control type, the predicted increases in yields, revenues and spawning stock biomass were small by comparison. The escape panel with the largest mesh size (type D) retained the least un-utilized and discarded by-catch. Whilst simulations predicted the highest spawner biomass per recruit, long term yields and revenues for the key species, its use was associated with a dramatic short-term decline in revenues which were 23.3% of the value of the control type. Traps fitted with the type C which had a square mesh of 7.5 × 7.5 cm had the lowest juvenile retention and the highest overall score for all the assessment criteria combined. The study provides an empirical basis for gear regulations for the demersal trap fishery of the Emirate of Abu Dhabi and the wider Arabian Gulf region.

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Biology and stock assessment of the Sparids, Acanthopagrus bifasciatus and Argyrops spinifer (Forsskål, 1775), in the Southern Arabian Gulf

Cited by 41 publications

References 28 publications

Fishing pattern and interactions of fleet components in the <I>Argyrops spinifer</I> (Actinopterygii: Perciformes: Sparidae) fisheries of the Arabian Sea, Oman

Fishing pattern and interactions of fleet components in the <I>Argyrops spinifer</I> (Actinopterygii: Perciformes: Sparidae) fisheries of the Arabian Sea, Oman

Spatial variation in demography of an estuarine teleost: implications for population and fishery assessments

An Evaluation of the Selectivity Characteristics of Different Juvenile Fish Escape Panel Designs for the Demersal Trap Fishery of Abu Dhabi, United Arab Emirates

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