Abstract
The demersal fish fauna of Albatross Bay, in the eastern Gulf of Carpentaria, northern Australia, was sampled on seven cruises from August 1986 to November 1988, using a random stratified trawl survey. Four depth zones between 7 and 45 m were sampled during both day and night. The mean biomass of fish from all seven cruises was 297 kg ha−1 for days trawls and 128 kg ha−1 for night trawls. The overall mean catch rates were 922 kg h−1 for day trawls and 412 kg h−1 for night trawls. There were marked differences between cruises in both the biomass and catch rate. Approx 890 000 fish of 237 species were collected. Of these, 25 species comprised 82% of the total biomass and 74% of the overall catch rate. The dominant families were Leiognathidae, Haemulidae and Clupeidae, with Sciaenidae and Dasyatidae important at night.Leiognathus bindus was the most abundant species. Twenty-five species occurred in more than 50% of trawls, withCaranx bucculentus the most frequently caught (96% of all trawls). Thirty four species were predators on prawns; their absolute mean biomass was 50 kg ha−1 during the day and 39 kg ha−1 at night. The corresponding catch rates were 171 and 125 kg h−1. Multiple-regression analyses were used to discriminate the effects of diel, seasonal, depth and cruise patterns. Of the 31 most abundant species, 15 showed diel patterns of abundance; 11 species showed seasonal patterns of abundance; 23 species had differential depth distribution; and 13 species showed significant cruise-to-cruise variation in abundance. Cruise variations in abundance were tested against salinity, temperature, tidal exchange, plankton biomass and prawn abundances as well as periods (and lags) of total rainfall prior to sampling. Only total rainfall showed any significant correlation. Total rainfall over a period of 6 wk immediately prior to sampling showed significant positive correlations with the abundances of five species, with overall daytime catch rates, and with the suite of 34 prawn predators. Rainfall and river runoff into Albatross Bay were significantly correlated. In Albatross Bay, the complex of factors affecting fish abundances and the magnitude of between-cruise differences indicate that such tropical communities may be unpredictable and are not seasonally constant. The high catch rates in Albatross Bay relative to similar tropical areas elsewhere are discussed and attributed to the light exploitation of the Albatross Bay stocks. Other than a prawn fishery, there is no commercial trawling in Albatross Bay. Hence, the only fishing mortality is a result of by-catch from prawn trawling. The annual total of such fish by-catch is probably less than 10% of the estimated standing stock of 93 000 tonnes.
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Literature cited
Alongi, D. M. (1989). The role of soft-bottom benthic communities in tropical mangrove and coral reef ecosystems. Reviews aquat. Sciences 1: 243–280
Balan, V. (1967). Biology of the silverbelly,Leiognathus bindus (Val.) of the Calicut coast. Indian J. Fish. 10: 118–134
Bapat, S. V., Radhakrishnan, N., Rasachandra Kartha, K. N. (1972). A survey of the trawl fish resources off Karwar, India. Proc. Indo-Pacif. Fish. Coun. 13: 354–383
Blaber, S. J. M., Blaber, T. G. (1980). Factors affecting the distribution of juvenile estuarine and inshore fish. J. Fish Biol. 17: 143–162
Blaber, S. J. M., Brewer, D. T., Salini, J. P. (1989). Species composition and biomasses of fishes in different habitats of a tropical northern Australian estuary: their occurrence in the adjoining sea and estuarine dependence. Estuar. cstl Shelf. Sci. 29: 509–531
Blaber, S. J. M., Salini, J. P., Brewer, D. T. (1990). A checklist of the fishes of Albatross Bay and the Embley estuary, north-eastern Gulf of Carpentaria. Rep. mar. Lab. C.S.I.R.O. Aust. 210: 1–22
Bowen, B. K., Hancock, D. A. (1985). Review of penaeid prawn fishery management regime in Australia. In: Rothlisberg, P. C., Hill, B. J., Staples, D. J. (eds.) Second Australian National Prawn Seminar. CSIRO, Cleveland, Australia, p. 247–265
Brewer, D. T., Blaber, S. J. M., Salini, J. P. (1989). The feeding biology ofCaranx bucculentus Alleyne and Macleay (Teleostei: Carangidae) in Albatross Bay, Gulf of Carpentaria; with special reference to predation on penaeid prawns. Aust. J. mar. Freshwat. Res. 40: 657–668
Brewer, D. T., Blaber, S. J. M., Salini, J. P. (In preparation). Predation on penaeid prawns by fishes in Albatross Bay, Gulf of Carpentaria
Budihardjo, S. (1988). Growth, mortality and biomass estimation of goat fish (Upeneus sulphureus) in the Java Sea, Indonesia. F.A.O. Fish. Rep. 389: 193–213
Chan, E. H., Liew, H. C. (1986). Characteristics of an exploited tropical shallow-water demersal fish community in Malaysia. In: Maclean, J. L., Dizon, L. B., Hosillos, L. V. (eds.) The First Asian Fisheries Forum. Asian Fisheries Society, Manila, p. 349–352
Darcy, G. H., Gutherz, E. J. (1984). Abundance and density of demersal fishes on the west Florida shelf, January 1978. Bull. mar. Sci. 34: 81–105
Darracott, A. (1977). Availability, morphometrics, feeding and breeding activity in a multi-species, demersal fish stock of the western Indian Ocean. J. Fish Biol. 10: 1–16
Druzhinin, A. D., Phone Hlaing, U. (1972). Observations on the trawl fishery of southern Burma. Proc. Indo-Pacif. Fish. Coun. 13: 151–209
Finney, D. J. (1941). On the distribution of a variate whose logarithm is normally distributed. IL R. statist. Soc. (Suppl.) 2: 155–161
Gulland, J. A. (1979). Report of the FAO/IOP workshop on the fishery resources of the Western Indian Ocean south of the equator. F.A.O. Indian Ocean Fish. Commn Dev. Rep. 79/45: 1–37
Harris, A. N., Poiner, I. R. (1990). The by-catch of the prawn fishery of the Torres Strait; composition and partitioning of the discards into components that float or sink. Aust. J. mar. Freshwat. Res. 41: 37–52
Haysom, N. (1985). Review of penaeid prawn fisheries of Australia. In: Rothlisberg, P. C., Hill, B. J., Staples, D. J. (eds.) Second Australian National Prawn Seminar. CSIRO, Cleveland, Australia, p. 195–203
Hobson, E. S. (1968). Predatory behavior of some shore fishes in the Gulf of California. Res. Rep. U.S. Fish Wildl. Serv. 73: 1–92
Hobson, E. S. (1972). Activity of Hawaiian reef fishes during the evening and morning transitions between daylight and darkness. Fish. Bull. U.S. 70: 715–740
Hobson, E. S. (1974). Feeding relationships of teleostean fishes on coral reefs in Kona, Hawaii. Fish. Bull. U.S. 721: 915–1031
Jones, M. R. (1987). Surficial sediments of the western Gulf of Carpentaria, Australia. Aust. J. mar. Freshwat. Res. 38: 151–167
Longhurst, A. R., Pauly D. (1987). Ecology of tropical oceans. Academic Press, San Diego, California, USA
Losse, G. F., Dwiponggo, A. (1977). Report on the Java Sea southeast monsoon trawl survey June–December 1976. Marine Fisheries Research Institute Jakarta, Indonesia. (Contr. demersal Fish. Proj. No. 3; Spec. Rep.)
Lowe-McConnell, R. H. (1987). Ecological studies in tropical fish communities. Cambridge University Press, Cambridge
May, J. L., Blaber, S. J. M. (1989). Benthic and pelagic fish biomass of the upper continental slope off eastern Tasmania. Mar. Biol. 101: 11–25
McManus, J. W. (1986). Depth zonation in a demersal fishery in the Samar Sea, Philippines. In: Maclean, J. L., Dizon, L. B., Hosiilos, L. V. (eds.) The First Asian Fisheries Forum. Asian Fisheries Society, Manila, p. 483–486
Mohsin, A. K. M., Said, M. Z. B. M., Ambak, M. A. B., Salam, M. N. B. A., Hayase, M. N., Sekioka, M. (1988). Marine catch by experimental trawlings in the south-western portion of the South China Sea. In: Mohsian, A. K. M., Rahman, R. A., Ambak, M. A. (eds.) Ekspedisi Matahari. A study on the offshore waters of the Malaysian EEZ. Faculty of Fisheries and Marine Science, Universiti Pertanian Malaysia, Serdang, Selangor, Malaysia, p. 113–120 (Occ. Publ. No. 4)
Mulyadi, E. (1988). Estimation of biomass and biological parameters ofPentaprion longimanus (Gerreidae) off the north coast of Java, Indonesia. F.A.O. Fish. Rep. 389: 246–256
Okera, W., Gunn, J. S. (1986). Exploratory trawl surveys by FRV Soela in the Australian fishing zone sector of the Timor-Arafura Seas and in the Gulf of Carpentaria, 1980–81. Rep. mar. Lab. C.S.I.R.O. Aust. 150: 1–104
Pauly, D. (1983). Some simple methods for the assessment of tropical fish stocks. F.A.O. Fish. tech. Pap. 234: 1–52
Pauly, D. (1988). Fisheries research and the demersal fisheries of southeast Asia. In: Gulland, J. A. (ed.) Fish population dynamics. John Wiley, London, p. 329–348
Pennington, M. (1986). Some statistical techniques for estimating abundance indices from trawl surveys. Fish. Bull. U.S. 84: 519–526
Potts, G. W. (1980). The predatory behaviour ofCaranx melampygus (Pisces) in the channel environment of Aldabra Atoll. J. Zool., Lond. 192: 323–350
Rainer, S. F. (1984). Temporal changes in a demersal fish and cephalopod community of an unexploited coastal area in northern Australia. Aust. J. mar. Freshwat. Res 35: 747–768
Rainer, S. F., Munro, I. S. R. (1982). Demersal fish and cephalopod communities of an unexploited coastal environment in northern Australia. Aust. J. mar. Freshwat. Res. 33: 1039–1055
Rothlisberg, P. C. (1982). Vertical migration and its effect on dispersal of penaeid shrimp larvae in the Gulf of Carpentaria, Australia. Fish. Bull. U.S. 80: 541–554
Sainsbury, K. J. (1987). Assessment and management of the demersal fishery on the continental shelf of northwestern Australia. In: Polovina, J. J., Ralston, S. (eds.) Tropical snappers and groupers: biology and fisheries management. Westview Press, Boulder Colorado, USA, p. 465–503
Salzen, E. A. (1957). A trawling survey off the Gold Coast. J. Cons. perm. int. Explor. Mer 23: 72–82
Shuntov, V. I. (1971). Some data on the biology of fishes of the Arafura Sea and their environmental conditions. J. Ichthyol. (USSR) 11: 1–13
Simpson, A. C. (1982). A review of the database on tropical multispecies stocks in the southeast Asian region. In: Pauly, D., Murphy, G. I. (eds.) Theory and management of tropical fisheries. International Center for Living Resources Management, Manilla, and Commonwealth Scientific and Industrial Research Organization, Cronulla, Australia, p 5–32
Staples, D. J., Vance, D. J. (1986). Emigration of juvenile banana prawns,Penaeus merguiensis, from a mangrove estuary and recruitment to the offshore area in the wet-dry tropics of the south-eastern Gulf of Carpentaria, Australia. Mar. Ecol. Prog. Ser. 23: 15–29
Sudradjat, A., Beck, U. (1978). Report on the southern South China Sea demersal trawl survey June and July 1978. Marine Fisheries Research Institute, Jakarta, Indonesia. (Contr. demersal Fish. Proj. No. 4; Spec. Rep.)
Wright, J. M. (1988). Seasonal and spatial differences in the fish assemblages of the non-estuarine Sulaibikhat Bay, Kuwait. Mar. Biol. 100: 13–20
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Communicated by G. F. Humphrey, Sydney
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Blaber, S.J.M., Brewer, D.T., Salini, J.P. et al. Biomasses, catch rates and abundances of demersal fishes, particularly predators of prawns, in a tropical bay in the Gulf of Carpentaria, Australia. Mar. Biol. 107, 397–408 (1990). https://doi.org/10.1007/BF01313421
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DOI: https://doi.org/10.1007/BF01313421