Synopsis
Twenty-one years of catch returns from the shore-based Natal sport fishery have been processed in order to detect trends in the composition of anglers' catches. Results presented indicate that there have been substantial changes, especially following a much increased abundance of juvenile sharks in the last decade. It is postulated that the most likely cause for this proliferation is the removal of large predatory sharks through protective gill netting.
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References cited
Bass, A. J. 1973. Analysis and description of variation in the proportional dimensions of scyliorhinid, carcharhinid and sphyrnid sharks. Invest. Rep. oceanogr. Res. Inst. 32: 1–28.
Bass, A. J., J. D. D'Aubrey & N. Kistnasamy. 1973. Sharks of the east coast of southern Africa, 1: The genusCarcharhinus (Carcharhinidae). Invest. Rep. oceanogr. Res. Inst. 33: 1–168.
Bass, A. J., J. D. D'Aubrey & N. Kistnasamy. 1975a. Sharks of the east coast of southern Africa, 3: The families Carcharhinidae (excludingMustelus andCarcharhinus) and Sphyrnidae. Invest. Rep. oceanogr. Res. Inst. 38: 1–100.
Bass, A. J., J. D. D'Aubrey & N. Kistnasamy. 1975b. Sharks of the east coast of southern Africa, 4: The families Odontaspididae, Scapanorhynchidae, Isuridae, Cetorhinidae, Alopiidae, Orectolobidae and Rhiniodontidae.Invest. Rep. oceanogr. Res. Inst. 39: 1–102.
Bass, A. J. 1976. Sharks. pp. 179–183. In: A. E. F. Heydorn (ed.) Ecology of the Agulhas Current region — an assessment of biological responses to environmental parameters in the south-west Indian Ocean, Trans. R. Soc. S. Afr. 43.
Bass, A. J. 1978. Problems in studies of sharks in the southwest Indian Ocean. pp. 545–594. In: E. S. Hodgson & R. F. Mathews (ed.) Sensory biology of sharks, skates and rays. Office of Naval Research, E. S. Navy, Arlington, Virginia.
Beverton, R. J. H. & B. B. Parrish. 1956. Commercial statistics in fish population studies. Rapp. P-v Reun. Cons. perm. int. Explor. Mer. 140.
Bigelow, H. B. & W. C. Schroeder. 1948. Fishes of the western north Atlantic, 1: Lancelets, cyclostomes and sharks. Mem. Sears Fdn. mar. Res.: 1–576.
Davies, D. H. 1964. About sharks and shark attack. Shuter and Shooter, Pietermaritzburg. 237 pp.
Davies, D. H. & L. E. S. Joubert. 1966. Tag evaluation and shark tagging in South African waters. Invest. Rep. oceanogr. Res. Inst. 12: 1–36.
Davis, B. & T. S. Wallett. 1975. Anti-shark measures as practised in Natal, Republic of South Africa. Natal Anti-Shark Measures Board Umhlanga Rocks. 19 pp.
Garrick, J. A. F. & L. P. Schultz. 1963. A guide to the kinds of potentially dangerous sharks. pp. 3–60, In: P. W. Gilbert (ed.) Sharks and survival. Heath Boston. 60 pp.
Gulland, J. A. 1955. Estimation of growth and mortality in commercial fish populations. Fish Invest. (Lond.) Ser. 2, 18: 1–46.
Holden, M. J. 1974. Problems in the rational exploitation of elasmobranch populations and some suggested solutions. pp. 117–137. In: F. R. Harden-Jones (ed.) Sea fisheries Research, Paul Eleck, London.
Holden, M. J. 1977. Elasmobranchs. pp. 187–215. In: J. A. Gulland (ed.) Fish population dynamics, John Wiley, London.
Jackson, L. F. 1976. Aspects of the intertidal ecology of the east coast of South Africa. Invest. Rep. oceanogr. Res. Inst. 46: 1–72.
Natal anti-shark measures board. White Paper to the Provincial Council. 1975/76.
Springer, S. 1960. Natural history of the sandbar shark Eulamia milberti. U.S. Fish. Bull. 61: 1–38.
Springer, S. P. W. Gilbert 1963. Anti-shark measures. pp. 465–476. In: P. W. Gilbert (ed.) Sharks and survival, Health, Boston.
Springer, S. 1967. Social organization of shark populations. pp. 149–174. In: P. W. Gilbert (ed.) Sharks, skates and rays, John Hopkins Press, Baltimore.
South Africa. Dept. of customs and excise. Foreign trade statistics, 1964–1976, v.1: Imports and exports. The dept., Pretoria.
Van der Elst, R. P. 1976a. Game fish of the east coast of southern Africa 1. The biology of the elf,Pomatomus saltatrix (Linnaeus) in the coastal waters of Natal. Invest. Rep. oceanogr. Res. Inst.44: 1–59.
Van der Elst, R. P. 1976. Marine sport fishing as a recreational activity. Conference on recreation research, Stellenbosch, 29 Sep.–1. Oct. 1976: 1–10.
Van der Elst, R. P. 1978. Marine teleost fishes. pp. 179–183. In: A. E. F. Heydon (ed.) Ecology of the Agulhas Current region — an assessment of biological responses to environmental parameters in the south-west Indian Ocean, Trans. R. Soc. S. Afr. 43.
Wallet, T. S. 1973. Analysis of shark meshing returns off the Natal coast. M. Sc. thesis, University of Natal, Durban 121 pp.
Wallett, T. S. 1976. The effects of shark nets on the ecology of the Natal coast. Natal Anti-Shark Measures Board, Umhlanga Rocks, Unpublished report. 13 pp.
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van der Elst, R.P. A proliferation of small sharks in the shore-based Natal sport fishery. Environ Biol Fish 4, 349–362 (1979). https://doi.org/10.1007/BF00005524
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DOI: https://doi.org/10.1007/BF00005524