Temporal and spatial distribution and abundance of blue swimmer crab (Portunus pelagicus) larvae in a temperate gulf
Simon R. Bryars A B D and Jon. N. Havenhand A CA School of Biological Sciences, Flinders University of South Australia, GPO Box 2100, Adelaide, SA 5001, Australia.
B Present address: SARDI Aquatic Sciences, PO Box 120, Henley Beach, SA 5022, Australia.
C Present address: Dept. of Marine Ecology, University of Gothenburg, Tjärnö Marine Biological Laboratory, 452 96 Strömstad, Sweden.
D Corresponding author. Email: bryars.simon@saugov.sa.gov.au
Marine and Freshwater Research 55(8) 809-818 https://doi.org/10.1071/MF04045
Submitted: 3 March 2004 Accepted: 12 October 2004 Published: 16 November 2004
Abstract
A plankton-sampling programme for blue swimmer crab (Portunus pelagicus) larvae was conducted in the temperate waters of Gulf St Vincent, South Australia, to investigate: (1) if larval hatching is seasonal; (2) if larvae are restricted to surface waters; (3) if larvae are hatched offshore; and (4) if larval development occurs offshore. The temporal and spatial distribution and abundance of larvae indicated that hatching and zoeal development occur mainly in deeper offshore waters during the warmer months of November to March, and that zoeal development occurs in a range of depths from the neuston to at least 14 m. Although peaks in abundance usually occurred in the upper 3 m, zoeae were distributed throughout the water column, with the majority occurring in sub-surface waters below 1 m depth. There was no evidence for a daylight ontogenetic or tidal vertical migration in the four zoeal stages. Limited sampling revealed no evidence for a diurnal vertical migration in stage-1 zoea. Although the seasonal and inshore-offshore patterns of hatching observed in the study were typical for a portunid species, the broad vertical distribution differed from that observed for P. pelagicus in previous studies.
Extra keywords: larval concentration, larval density, megalopae, sea surface temperature.
Acknowledgments
We are deeply grateful to Andrew Hogg, Peter Daenke, Helen Lulofs, Dr Peter Strutton, Keith Rowling, Dr Claire Moss, Dr Toby Bolton, Dr John Bye, Kym Byers, Dr George Matsumoto, Dr Jim Mitchell, Dr Craig Styan, Craig Noell, Dr Rick McGarvey, the Department of Zoology at The University of Adelaide, and Dennis Holder for invaluable technical advice and unstinting laboratory and field support. This study was supported by an Australian Postgraduate Award (to SRB), and by an internal grant from Flinders University (to JNH).
Botsford, L. W. , and Shenker, J. M. (1986). Possible influence of wind on Cancer magister settlement. Journal of Shellfish Research 7(1), 111.[Abstract]
Campbell, G. R. , and Fielder, D. R. (1986). Size at sexual maturity and occurrence of ovigerous females in three species of commercially exploited portunid crabs in south-east Queensland. Proceedings of the Royal Society of Queensland 97, 79–87.
Gaughan, D. J. , and Potter, I. C. (1994). Relative abundance and seasonal changes in the macrozooplankton of the lower Swan estuary in south-western Australia. Records of the Western Australian Museum 16(4), 461–474.
Hill, B. J. (1994). Offshore spawning by the portunid crab Scylla serrata (Crustacea: Decapoda). Marine Biology 120(3), 379–384.
Kurata, H. , and Midorikawa, T. (1975). The larval stages of the swimming crabs, Portunus pelagicus and P. sanguinolentus, reared in the laboratory. Bulletin Nansei Regional Fisheries Research Laboratories 8, 29–38.
Phillips, B. F. , Brown, P. A. , Rimmer, D. W. , and Reid, D. D. (1979). Distribution and dispersal of the phyllosoma larvae of the western rock lobster, Panulirus cygnus, in the south-eastern Indian Ocean. Australian Journal of Marine and Freshwater Research 30, 773–783.
Tankersley, R. A. , Wieber, M. G. , Sigala, M. A. , and Kachurak, K. A. (1998). Migratory behavior of ovigerous blue crabs Callinectes sapidus: Evidence for selective tidal-stream transport. Biological Bulletin 195(2), 168–173.
Williams, M. J. (1982). Natural food and feeding in the commercial sand crab Portunus pelagicus Linnaeus, 1766 (Crustacea: Decapoda: Portunidae) in Moreton Bay, Queensland. Journal of Experimental Marine Biology and Ecology 59, 165–176.
| Crossref | GoogleScholarGoogle Scholar |