Volume 6, Issue 3, May 2018, Page: 35-42
Natural Diet of Two Commercial Crab Species, Portunus segnis (Forskål, 1775) and P. sanguinolentus (Herbst, 1783), in the Coastal Waters of Karachi
Shazia Rasheed, Faculty of Marine Sciences, Lasbela University of Agriculture, Water and Marine Sciences, Uthal, Pakistan
Javed Mustaquim, Centre of Excellence in Marine Biology, University of Karachi, Karachi, Pakistan
Received: Apr. 26, 2018;       Accepted: May 17, 2018;       Published: Jun. 25, 2018
DOI: 10.11648/j.avs.20180603.11      View  1871      Downloads  140
Stomach contents of 558 Portunus segnis (Forskål, 1775) and 426 P. sanguinolentus (Herbst, 1783), from coastal waters of Karachi were examined. Crabs were collected from Korangi Creek, Karachi from January 2004 to December 2005. The frequency of occurrence and points methods were used for the stomach contents analysis. Out of 558 P. segnis and 426 P. sanguinolentus, 254 (45.52%) and 227 (53.3%) crabs had empty stomach, respectively. Mollusca and Crustacea dominated the diet of both the species. According to points method Mollusca and Crustacea scored 67.28% and 53.8% points in P. segnis and P. sanguinolentus, respectively. When analyzed by frequency of occurrence method Mollusca and Crustacea occurred in 88.37% and 71.4% stomachs in P. segnis and P. sanguinolentus, respectively. Majority of the Mollusca eaten by P. segnis and P. sanguinolentus were small soft-shelled bivalves while Crustacea included mostly small crabs. Small fish, shrimps, polychaete worms, sponges, starfishes, brittle stars, bryozoans, and plant (algae) materials were also present in some stomachs in small quantity. Results of the present study suggest that the two crab species are opportunistic predator competing for food in the natural environment.
Stomach Content, Portunid Crabs, Pakistan
To cite this article
Shazia Rasheed, Javed Mustaquim, Natural Diet of Two Commercial Crab Species, Portunus segnis (Forskål, 1775) and P. sanguinolentus (Herbst, 1783), in the Coastal Waters of Karachi, Animal and Veterinary Sciences. Vol. 6, No. 3, 2018, pp. 35-42. doi: 10.11648/j.avs.20180603.11
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abdel-Razek, F. A., 1988. Some biological studies on the Egyptian Crab Portunus pelagicus (Linnaeus, 1766). Acta Adriatica, 29: 133-143.
Bahuguna, S. N., Rawat, A. R. and Singh, S. 2016. Diet composition of freshwater crab, Potamon koolooense Rathbun, 1904 from hill stream of Uttarakhand. Journal of Applied and Natural Science, 8: 301-304.
Chande, A. I. and Mgaya, Y. D., 2004. Food habits of the blue swimming crab Portunus pelagicus along the coast of Dar es Salaam, Tanzania. WIO J. Mar. Sci. 3: 37-42.
Edgar, G. J., 1990. Predator-prey interactions in sea grass beds. II. Distribution and diet of the blue manna crab Portunus pelagicus Linnaeus at Cliff head, Western Australia. J. Exp. Mar. Biol. Ecol., 139: 23-32.
Hashmi, S. S., 1963a. Carcinological fauna of Karachi. Agric. Pak., 14: 237–243.
Hashmi, S. S., 1963b. Relative abundance of edible crabs of family Portunidae in Karachi off- shore waters. Pak. J. Sci., 15: 115–119.
Hosseini, M., Pazooki, J., Safaie, M. and Tadi-Bani, F., 2014. The biology of the blue swimming crab Portunus segnis (Forskal, 1775) along the Bushehr coast, Persian Gulf. Envir. Stud. PersianGulf, 1: 1-92.
Hynes, H. B. N., 1950. The food of the fresh water sticklebacks Gasterosteus aculeatus and Pygosteus pungitius, with a review of methods used in studies of the food of the fishes. J. Animal Ecol., 19:36-58.
Khan, M. A., 1975. Portunidae of Pakistan. Agric. Pak., 26: 377–392.
Khan, M. A. and Ahmed, M. F., 1975. A checklist of Brachyura of Karachi coasts, Pakistan. Rec. Zool. Surv. Pak., 7: 71–85.
Lai, J. C. Y., Ng, P. K. L. and Dave, P. J. F., 2010. A revision of the Portunus pelagicus (Linnaeus, 1758) species complex (Crustacea: Brachyura: Portunidae), with the recognition of four species. The Raffles Bull. Zool., 58: 199–237.
Mustaquim, J. and Rabbani, M. M., 1976. Species of Portunid Crabs (Decapoda: Brachyura) from Karachi. Pakistan J. Sci. Ind. Res., 19: 161–164.
Patel, N. M., Chhaya, N. D. and Bhaskaran, M. 1979. Stomach contents of Portunus pelagicus (Linn.) from AD net catches. Indian J. Mar. Sci, 8: 48-49.
Pazooki, J., Hosseini, M. and Vaziri Z. A. 2012. The Dietary Compositions of the Blue Swimming Crab, Portunus segnis (Forskal, 1775) from Persian Gulf, South Iran. World Appl. Sci. J., 20: 416–22.
Pollard, D. A. 1973. The biology of a landlocked form of normally catadromous salmoniform fish Galaxias maculates (Jenyns). V. Composition of diet. Aust. J. Mar. Freshwater Res., 10: 365 374.
Safaie, M. 2016. Feeding habits of blue swimming crab Portunus segnis (Forskal, 1775) in the northern coastal waters of Iran. Marine Biodiversity Records, 68: 1-9.
Sharifian, S., kamrani, E., Safaie, M. and Sharifian, S. 2017a. Population structure and growth of freshwater crab Sodhiana iranica from the south of Iran. Fundamental and Applied Limnology; Official Journal of the International Association of Theoretical and Applied Limnology, 189 (4), 341-349.
Sharifian, S. and Kamran, E. 2017. Feeding habits of the freshwater crab Sodhiana iranica from Southern Iran. Acta. Limnol. Bras., 29: e16.
Sukumaran, K. K. and Neelakantan, B. 1997. Relative growth and sexual maturity in the marine crabs, Portunus (Portunus) sanguinolentus (Herbst) and Portunus (Portunus) pelagicus (Linnaeus) along the southwest coast of India. Indian J. Fish., 43: 215-223.
Tirmizi, N. M. and Kazmi, Q, B. 1996. Marine Fauna of Pakistan: 6, Crustacea: Brachyura, Brachyrhyncha. Part. 2 (Portunidae): 1-97. Marine Reference Collection and Resource Centre, University of Karachi.
Wessenberg T. J. and Hill. B. J. 1987. Feeding by the sand crab Portunus pelagicus on material discarded from prawn trawlers in Moreton bay, Australia. Mar. Bio., 95: 387-393.
Williams, M. J. 1981. Method for analysis of natural diet in portunid crabs (Crustacea: Decapoda: Portunidae). J. Exp. Mar. Bio. Ecol., 52: 103-113.
Williams, M. J. 1982. Natural food and feeding in the commercial sand crab Portunus pelagicus (Linnaeus, 1766) (Crustacea: Decapoda: Portunidae) in Moreton Bay, Queensland. J. Exp. Mar. Bio. Ecol., 59: 165-176.
Wu, R. S. S. and Shin, P. K. S. 1998. Food segregation in three species of portunid crabs. Hydrobiologia, 362: 1573-5117.
Zainal, K. A. Y. (2013). Natural food and feeding of the commercial blue swimmer crab, Portunus pelagicus (Linnaeus, 1758) along the coastal waters of the Kingdom of Bahrain. J. Assoc. Arab Uni. Bas. Appl. Sci., 13: 1–7.
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