Marine Biology

, Volume 78, Issue 1, pp 75–85 | Cite as

The biology of the blue manna crab Portunus pelagicus in an Australian estuary

  • I. C. Potter
  • P. J. Chrystal
  • N. R. Loneragan
Article

Abstract

Various aspects of the biology of the blue manna crab Portunus pelagicus have been investigated in the large Peel-Harvey estuarine system of Western Australia, using samples collected regularly by beach seine, gill net and otter trawl between February 1980 and July 1981. Whereas crabs were widely dispersed throughout Peel Inlet, Harvey Estuary and the saline regions of tributary rivers during the summer and autumn, they were found mainly near the estuary mouth in the winter and spring. Since our data suggest that P. pelagicus has a preference for salinities of 30 to 40‰, the above changes in distribution are apparently related to the marked seasonal variation in salinity which results from the very seasonal pattern of rainfall. The number of ovigerous crabs in the estuary were greatest in January and February. The mean carapace width and number of eggs of ovigerous females were 110 mm (range 85 to 157 mm) and 509 433 (range 270 183 to 847 980), respectively. P. pelagicus started to reach the minimum legal size for capture (carapace width 127 mm) in the summer when they were approximately I yr old, and left the system in large numbers in the following winter when they were 15 to 20 mo old. These features explain why the fishery for P. pelagicus is highly seasonal, with the vast majority of crabs being taken between January and May. As crabs approached the end of their first year of life, the ratio of females began to exceed that of males, apparently as a result of the movement of males out of the system and legislation against the capture of ovigerous females.

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Literature cited

  1. Anonymous: Crab research programme — Leschenault Inlet Bunbury. Fins (Perth, Australia) 3, 18–27 (1970)Google Scholar
  2. Australian Bureau of Statistics: Fisheries, Western Australia (1979–80), 16 pp. Perth: Australian Bureau of Statistics 1980Google Scholar
  3. Baker, R. J. and J. A. Nelder: The GLIM System Release 3 Manual, 174 pp. Oxford: Numerical Algorithms Group 1978Google Scholar
  4. Darnell, R. M.: Studies of the life history of the blue crab (Callinectes sapidus Rathbun) in Louisiana waters. Trans. Am. Fish. Soc. 88, 294–304 (1959)Google Scholar
  5. Dhawan, R. M., S. N. Dwivedi and G. V. Rajamanickam: Ecology of the blue crab Portunus pelagicus (Linnaeus) and its potential fishery in Zuari Estuary. Indian J. Fish. 23, 57–64 (1976)Google Scholar
  6. Hill, B. J.: Abundance, breeding and growth of the crab Scylla serrata in two South African estuaries. Mar. Biol. 32, 119–126 (1975)Google Scholar
  7. Hill, B. J., M. J. Williams and P. Dutton: Distribution of juvenile, subadult and adult Scylla serrata (Crustacea: Portunidae) on tidal flats in Australia. Mar. Biol. 69, 117–120 (1982)Google Scholar
  8. Krishna Pillay, K. and N. Balakrishnan Nair: The annual reproductive cycles of Uca annulipes, Portunus pelagicus and Metapenaeus affinis (Decapoda: Crustacea) from the southwest coast of India. Mar. Biol. 11, 152–166 (1971)Google Scholar
  9. Meagher, T. D.: Ecology of the crab Portunus pelagicus (Crustacea: Portunidae) in south western Australia, 232 pp. Ph. D. thesis, University of Western Australia 1971Google Scholar
  10. Penn, J. W.: Trawl caught fish and crustaceans from Cockburn Sound. Rep. Dep. Fish. Wildl. West. Aust. 20, 1–24 (1977)Google Scholar
  11. Phillips, W. J. and L. R. G. Cannon: Ecological observations on the commercial sand crab, Portunus pelagicus (L.), and its parasite, Sacculina granifera Boschma, 1973 (Cirripedia: Rhizocephala). J. Fish. Dis. (Oxford, England). 1, 137–149 (1978)Google Scholar
  12. Potter, I. C., N. R. Loneragan, R. C. J. Lenanton and P. J. Chrystal: Blue-green algae and fish population changes in a eutrophic estuary. Mar. Pollut. Bull. 14, 228–233 (1983 a)Google Scholar
  13. Potter, I. C., N. R. Loneragan, R. C. J. Lenanton, P. J. Chrystal and C. J. Grant: Abundance, distribution and age structure of fish populations in a Western Australian estuary. J. Zool., Lond. 200, 21–50 (1983 b)Google Scholar
  14. Prasad, R. R. and P. R. S. Tampi: An account of the fishery and fishing methods of Neptunus pelagicus (Linnaeus) near Mandapam. J. Zool. Soc. India 3, 335–339 (1951)Google Scholar
  15. Prasad, R. R. and P. R. S. Tampi: Some aspects of relative growth in the blue swimming crab Neptunus pelagicus (Linnaeus). Proc. natn. Inst. Sci. India 20, 218–234 (1954)Google Scholar
  16. Shinkarenko, L.: Development of the larval stages of the blue swimming crab Portunus pelagicus L. (Portunidae: Decapoda: Crustacea). Aust. J. mar. Freshwat. Res. 30, 485–503 (1979)Google Scholar
  17. Siegel, S.: Nonparametric statistics for the behavioral sciences, 312 pp. New York: McGraw Hill Book Co. 1956Google Scholar
  18. Smith, H.: Blue crabs in South Australia — their status, potential and biology. Safic (Adelaide, Australia) 6, 6–9 (1982)Google Scholar
  19. Stephenson, W.: Evolution and ecology of portunid crabs, with especial reference to Australian species. In: The evolution of living organisms, pp 311–327. Ed. by G. W. Leeper. Melbourne: Melbourne University Press 1962Google Scholar
  20. Tagatz, M. E.: Growth of juvenile blue crabs, Callinectes sapidus Rathbun, in the St. Johns River, Florida. Fishery Bull. Fish Wildl. Serv. U.S. 67, 281–288 (1969)Google Scholar
  21. Thomson, J. M.: Catch composition of the sand crab fishery in Moreton Bay. Aust. J. mar. Freshwat. Res. 2, 237–244 (1951)Google Scholar
  22. Van Engel, W. A.: The blue crab and its fishery in Chesapeake Bay. Part 1. Reproduction, early development, growth and migration. Comml Fish. Rev. 20, 6–17 (1958)Google Scholar
  23. Williams, M. J.: Natural food and feeding in the commercial sand crab Portunus pelagicus Linnaeus, 1766 (Crustacea: Decapoda: Portunidae) in Moreton Bay, Queensland. J. exp. mar. Biol. Ecol. 59, 165–176 (1982)Google Scholar

Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • I. C. Potter
    • 1
  • P. J. Chrystal
    • 1
  • N. R. Loneragan
    • 1
  1. 1.School of Environmental and Life SciencesMurdoch UniversityMurdochAustralia

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