Reproductive Biology and Feeding Ecology of The Blue Swimming Crab (Portunus pelagicus) in Northern Coastal Waters, Sri Lanka

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S S K Haputhantri
K H K Bandaranayake
M I G Rathnasuriya
K G S Nirbadha
S J W W M M P Weerasekera
A A S H Athukoorala
R A M Jayathilaka
H A C C Perera
S Creech

Abstract

Blue swimming crab (Portunus pelagicus) fishery has emerged to become an important export-oriented fishery in Sri Lanka over a decade and recently resulted in a rapid increase in the exploitation. The present study attempts to understand the reproductive biology and feeding ecology of blue swimming crab which will be vital in the management of capture fishery. Five major landing sites in the Jaffna district in Northern Sri Lanka, where blue swimming crab is frequently landed throughout the year were selected for the study. Biological parameters relating to sex, carapace width, body weight, maturity, and egg sac colour with egg sac weight were recorded at the field from November 2014 to October 2015. Randomly selected crab samples were brought to the laboratory and analysed for their maturity stages, length at first maturity, Gonadosomatic Index, fecundity, and gut contents. The study revealed that male crabs mature at a smaller size than females. The sex ratio varied greatly with time and males were always dominant in the catch. The blue swimming crabs in the Northern waters of Sri Lanka spawn throughout the year, with two spawning peaks in February and May. The total fecundity of ovigerous blue swimming crab increased with increased carapace width and body weight and it ranged from 123,482 to 3,179,928 eggs, with an average of 884,982 ± 676,420. A remarkably higher percentage of empty stomachs were observed under the present study in both mature and immature crabs and this could be due to lack of food availability in the environment and different digestibility rates of food items. The diet of blue swimming crab is highly variable reflecting the ability to adopt to different modes of feeding.

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How to Cite
Reproductive Biology and Feeding Ecology of The Blue Swimming Crab (Portunus pelagicus) in Northern Coastal Waters, Sri Lanka. (2022). Tropical Life Sciences Research, 33(2), 155–178. https://doi.org/10.21315/tlsr2022.33.2.8
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Original Article

References

Arshad A, Efrizal Kamarudin M S and Saad, C R. (2006). Embryology and larval development of BSC Portunus pelagicus (Linnaeus, 1758) under laboratory conditions. Research Journal of Fisheries and Hydrobiology 1(1): 35–44.

Asemari N, Matdah N A, Das S K and Bakar, Y. (2018). Estimation of size at sexual maturity of blue crab, Portunus pelagicus in peninsular Malaysia. Malaysian Journal of Fundamental and Applied Sciences 47(6): 69–75.

Batoy C B, Sarmago J F and Pilapil B C. (1987). Breeding season, sexual maturity and fecundity of the blue crab, Portunus pelagicus (L.) in selected coastal waters in Leyte and Vicinity, Philippines. Annales of Tropical Research 9: 157–177.

De Lestang S, Hall N G and Potter I C. (2003). Reproductive biology of the BSC (Portunus pelagicus, Decapoda: Portunidae) in five bodies of water on the west coast of Australia. Fishery Bulletin 101: 745–757.

Dineshbabu A P, Sreedhara B and Muniyappa Y. (2007). Fishery and stock assessment of Portunus sanguinolentus (Herbst) from south Karnataka coast, India. Journal of the Marine Biological Association of India 49(2): 134–140.

________. (2008). Biology and exploitation of the BSC, Portunus pelagicus (Linnaeus, 1758), from south Karnataka Coast, India. Indian Journal of Fisheries 55(3): 215–220.

Grove-Jones R. (1987). Catch and effort in the South Australian blue crab (Portunus pelagicus) fishery. South Australian Department of Fisheries. Adelaide. 45 pp.

Haputhantri S S K, Weerasekera S J W W M M P and Bandaranayake K H K. (2021). Morphometric relationships in the blue swimming crabs, (Portunus pelagicus) (LINNAEUS, 1758) from the Palk Bay, Sri Lanka. Asian Journal of Fisheries and Aquatic Research 11(2): 29–38. https://doi.org/10.9734/ajfar/2021/v11i230199

Holden M J and Rait D F S. (1974). Manual of fisheries science part 2 - Methods of resource investigation and their application. Rome: Food and Agriculture Organization of the United Nations, 255 pp.

Johnson D D, Charles A G and William G M. (2010). Reproductive biology of Portunus pelagicus in a Southeast Australian estuary. Journal of Crustacean Biology 30(2): 200–205. https://doi.org/10.1651/08-3076.1

Josileen J. (2011). Food and feeding of the blue swimming crab, Portunus pelagicus (Linnaeus, 1758) (Decapoda, Brachyura) along the coast of Mandapam, Tamil Nadu, India. Crustaceana 84(10):1169–1180. https://doi.org/10.1163/001121611X590111

Josileen J and Menon N G. (2007). Fishery and growth parameters of the blue swimmer crab Portunus pelagicus (Linnaeus, 1758) along the Mandapam Coast, India. Marine Biological Association of India 49: 159–165.

King M. (1995). Fisheries biology assessment and management. Fishing news books. Oxford, UK: Blackwell Science Ltd. 342 pp.

Kumar M S, Ferguson G, Xiao Y, Hooper G and Venema S. (2000). Studies on reproductive biology and distribution of the BSC (Portunus pelagicus) in South Australia waters. SARDI Research Report Series, 47 pp.

Kunsook C, Gajaseni N and Paphavasit N. (2014). The feeding ecology of the blue swimming crab, Portunus pelagicus (Linnaeus, 1758), at Kung Krabaen Bay. Chanthaburi Province, Thailand. Tropical Life Sciences Research 25(1): 13–27.

McCullagh P and Nelder J A. (1989). Generalized linear models, 2nd ed. London: Chapman and Hall. https://doi.org/10.1007/978-1-4899-3242-6

Meagher T. (1971). Ecology of the crab Portunus pelagicus (Crustacea-Portunidae) in South Western Australia. PhD Diss., University of Western Australia.

Safaie M, Pazooki J, Kiabi B and Shokri M R. (2012). Reproductive biology of BSC, Portunus segnis (Forskal, 1775) in coastal waters of Persian Gulf and Oman Sea, Iran. Iranian Journal of Fisheries Sciences 12(2): 430–444.

Smith G S and Sumpton W D. (1987). Sand crabs a valuable fishery in southeast Queensland. Queensland Fisherman 5: 13–15.

Sudtongkong C. (2006). Reproductive biology of P. pelagicus Linnaeus in Sikao Bay southern Thailand. The International Conference on Coastal Oceanography and Sustainable Marine Aquaculture, Confluence & Synergy. Kota Kinabalu, Sabah Malaysia, 2–4 May 2006. 151–160.

Sukumaran K K and Neelakantan B. (1996). Relative growth and sexual maturity in the marine crabs, Portunus (Portunus) sanguinolentus (Herbst) and Portunus (Portunus) pelagicus (Linnaeus), along south west coast of India. Indian Journal of Fisheries 43 (3): 215–223.

Sumpton W D and Potter M A and Smith G S. (1994). Reproduction and growth of the commercial sand crab, Portunus pelagicus (L.) in Moreton Bay, Queensland. Asian Fisheries Science 7: 103–113.

Sumpton W and Williams L E. (2002). Blue Swimmer Crab. In Williams L E (ed). Queensland’s Fisheries Resources. Current condition and recent trends, 1988–2000. Department of Primary Industries, Brisbane. 119–123.

Sustainable Fisheries Partnership (SFP) (2016). Blue swimming crab India. FishSource profile. https://www.fishsource.org/stock_page/743 (Accessed on 18 January 2022).

Wassenberg T J and Hill B J. (1987). Feeding by the sand crab P. pelagicus on material discarded from prawn trawlers in Moreton Bay. Australia. Marine Biology 95: 387–393.

Wear R G and Haddon M. (1987). Natural diet of the crab Ovalipes catharus (Crustacea, Portunidae) around central and northern New Zealand. Marine Ecology Progress Series 35: 39–49.

Williams M J. (1981). Methods for analysis of natural diets in Portunid crabs (Crustacea: Decapoda: Portunidae). Journal of Experimental Marine Biology and Ecology 52(1): 103–113.

Zainal K A Y. (2013). Natural food and feeding of the commercial blue swimmer crab, P. pelagicus (Linnaeus, 1758) along the coastal waters of the Kingdom of Bahrain. Journal of the Association of Arab Universities for basic and applied sciences 13: 1–7.

Zairion Y W, Boer M and Fahrudin A. (2015). Reproductive biology of the blue swimming Crab Portunus pelagicus (Brachyura: Portunidae) in East Lampung Waters, Indonesia: Fecundity and reproductive potential. Tropical Life Sciences Research 26(1): 67–85