Study on catch composition، length frequency and catch per unit effort of Scombridae gillnet in Konarak, Sistan-Baluchestan, Iran

Document Type : Ecology

Authors

Department of Fisheries , Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources, Iran

Abstract

The main purposes were included: measure of catch composition, length frequency and catch per unit effort (CPUE) of Scombridae gillnet. Present study was conducted in coastal waters of Konarak located at Sistan-Baluchestan province, Iran during winter and spring seasons of 2016. Sampling operations with 16 times hauling using two Dhows with a length of 25 meters and a width of 7.67 m were done. Catch composition was comprised of 11 families including; Scombridae, Carangidae, Ariidae, Lethrinidea, Sphyraenidae, Lutjanidae, Haemulidae, Stromateidae, Sciaenidea and Dasyatidae with the total weight percentage of 48.46, 25.01, 7.3, 3.93, 3.53, 3.37, 3.04, 2.74, 1.44 and 0.32 % respectively. In this study, highest weights percentages of total catch in gillnet were related to Scombridae family with 30.67 % and 41.42 % in winter and spring, respectively. Also, the lowest weight percentage in winter and spring were belonging to Dasyatidae (Dasyatis bennetti) with 0.09 % and Lethrinidae (Lethrinus nebulosus) with 0.11 %, respectively. In Tuna fishes, Scombridae family with 4 species showed the highest number of species in the catch composition. The most length frequency in tuna fish were included; length range of 105-119 cm (40.7%) in Scomberomorus commerson, length range of 84-92 cm (40%) in Thunnus tonggol and length range of 58-65 cm (38%) in Euthynnus affinis,  respectively. Also there was no significant difference between CPUE in winter and spring seasons (P>0.05).

Keywords

References

  1. Abdulqader, E.A.A.; Godlard, S.; McIlwain, J. and Claereboudt, M., 2001.The GCC Spanish Mackerel Fisheries Monitoring Program. 1st International conference on fisheries, aquaculture and environment in the NW Indian Ocean, Sultan Qaboos university. Muscat.Sultanate of Oman January. pp: 49-55.
  2. Claereboudt, M.R.; McIlwain, J.L.; Al-Oufi, H.S. and Ambu-Ali, A.A., 2005. Patterns of reproduction and spawning of the kingfish (Scomberomorus commerson, Lacepede, 1800) in the coastal waters of the Sultanate of Oman. Fisheries Research. Vol. 73, pp: 273-282.
  3. Clarke, K.R., 1993. Non-parametric multivariate analyses of changes in community structure. Australian Journal of Ecology. Vol. 18, pp: 117-143.
  4. Emmanuel, B.E.; Chukwu, L.O. and Azeez, L.O., 2008. Gill net selectivity and catch rates of pelagic fish in tropical coastal lagoonal ecosystem. African Journal of Biotechnology. Vol. 7, pp: 3962-3971.
  5. Emmanuel, B.E. and Chukwu, L.O., 2010. Evaluating the selective performance of gillnets used in a tropical low brackish lagoon south western, Nigeria. Journal of American Science. Vol. 6, pp: 49-52.
  6. Fridman, A.L., 1986. Calculations for fishing gear designs. Eds. By. P.J.G. Carrothers. FAO Fishing Manual. Fishing News Books, Oxford. 241 P.
  7. Grandcourt, E.M.; Al Abdessalaam, T.Z.; Francis, F. and Al Shamsi, A.T., 2005. Population biology and assessment of the orange-spotted grouper, Epinephelus coioides (Hamilton, 1822), in the southern Persian Gulf, Fisheries Research. Vol. 74, No. 1, pp: 55-68.
  8. Ghodrati, S.M.; Taghavi motlagh, A.; Seyfabadi, S.J. and Abtahi, B., 2007. Age, Growth and Mortality Rate of the Narrow-Barred Spanish Mackerel Scomberomerus commerson (Lacepède, 1800) in Coastal Waters of Iran from Length Frequency Data. Turkish Journal of Fisheries and Aquatic Sciences. Vol. 7, pp: 115-121.
  9. Guy, C.S.; Willis, D.W. and Schultz, R.D., 1996. Comparison of catch per unit effort and size structure of white crappies collected with trap nets and gill nets. North American Journal of Fisheries Management. Vol. 16,
    pp: 947-951.
  10. Marsia, I. and Batista, C.M., 2009. Catches of target species and bycatches of an artisanal fishery: The case study of a trammel net fishery in the Portuguese Coast. Fisheries Research. Vol. 100, pp: 167-177.
  11. Metin, C.; Lok, A. and Ilkyaz, T.A., 1998. The selectivity of gill net in different mesh size for Diplodus annularis
    (L. 1758) and Spicara flexuosa (Rafinesque, 1810). Turkish Journal of Fisheries and Aquatic Sciences. Vol. 15, pp: 3-4.
  12. Millner, R.S., 1985. The use of anchord gill and tangle nets in the sea fisheries of England and Wales. MAFF Directorate of fisheries Research, Lowestoft, UK, Laboratory Leaflet. 57 P.
  13. Newman, S.J.; Williams, D.M.; Mackie, M.C. and Lewis, P.D., 2012. Age-based demography and relative fisheries productivity of Spanish mackerel, Scomberomorus commerson (Lacepede, 1800) in Western Australia. Fisheries Research. Vol. 129, pp: 46-60.
  14. Pierce, R.B.; Tomcko, C.M. and Kolander, T.D., 1994. Indirect and direct estimates of gillnet size selectivity for northern pike. North American Journal of Fisheries Management. Vol. 14, pp: 170-177.
  15. Pillai, P.P.; Pillai, N.G.; Sathianandan, K.T.V. and Kesavan Elaythu, M.N.K., 1993. Fishery, Biology and Stock assessment of Scomberomorus commerson from the southwest coast of india. Expert Consultation on Indian Ocean tuna. 5th session, Mahe, Seychelles. 21 P.
  16. Siddeek, M., 1995. Review of fisheries biology of Scomberomorous and Acanthocybium species in the western Indian Ocean (FAO, Area 51. WGP).  18 P.
  17. Sturges, H., 1926. The choice of a class-interval. Journal of the American Statistical Association. Vol. 21, No.153, pp: 65-66.
  18. Taghavi, M.S.A.; Hashemi, S.A. and Kochanian, P., 2010. Population biology and assessment of Kawakawa (Euthynnus affinis) in Coastal Waters of the Persian Gulf and Sea of Oman (Hormozgan Province). Iranian Journal of Fisheries Sciences. Vol. 9, No. 2, pp: 315-326.
  19. Sparre, P. and Venema, S.C., 1998. Introduction to Tropical Fish Stock Assessment I: Manual. FAO Fish. Tech.
    Paper, 306.1 Rev.2. Rome. 407 P.
  20. Von Brandts, A., 2005. Fish catching methods of the words. Edited by Thomas Wendt, Erdmann Dahm, Klaus Lange, Otto Gabriel, Blackwell Publishing Limited. 536 P.

 

Journal of Animal Environment
Volume 10, Issue 1
April 2018
Pages 271-280

Files

Share

How to cite

Statistics