Size distributions and sex ratios of sharks caught by Oman’s artisanal fishery

  • AC Henderson
  • JL McIlwain
  • HS Al-Oufia
  • S Al-Sheile
  • N Al-Abri

Abstract

Oman’s fishery resources are exploited by artisanal and industrial fisheries, but the former accounts for almost 90% of landings. Within the artisanal fishery, sharks have traditionally been harvested for their flesh, but the development of a valuable export market for shark fin has led to increased utilisation of this resource, and anecdotal information suggests that shark abundance has decreased in recent years. Whereas management of the shark fishery is desirable, the  biological and socio-economical data on which to base any management plan are lacking. The present study was undertaken to  collect size frequency and sex ratio information from the shark species most commonly encountered in the artisanal landings, namely Carcharhinus falciformis, C. limbatus, C. macloti, C. sorrah, Iago  omanensis, Loxodon macrorhinus, Rhizoprionodon acutus and Sphyrna lewini. The occurrence of large female sharks in the landings, combined with a high proportion of juveniles of certain species, suggests that speciesspecific size restrictions should be considered in any management plan for Oman’s shark fishery.

Keywords: artisanal fishery; Indian Ocean; management; shark

African Journal of Marine Science 2009, 31(2): 233–239

Author Biographies

AC Henderson
Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultan Qaboos University, PO Box 34, Al-Khod 123, Sultanate of Oman
JL McIlwain
Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultan Qaboos University, PO Box 34, Al-Khod 123, Sultanate of Oman
HS Al-Oufia
Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultan Qaboos University, PO Box 34, Al-Khod 123, Sultanate of Oman
S Al-Sheile
Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultan Qaboos University, PO Box 34, Al-Khod 123, Sultanate of Oman
N Al-Abri
Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultan Qaboos University, PO Box 34, Al-Khod 123, Sultanate of Oman
Section
Articles

Journal Identifiers


eISSN: 1814-2338
print ISSN: 1814-232X