Hydrobiologia

, Volume 190, Issue 3, pp 253–262

Population dynamics of two small cichlid fish species in a tropical man-made lake (Lake Kariba)

  • K. Hustler
  • B. E. Marshall
Article

Abstract

The population dynamics of two small cichlid fishes (Pharyngochromis darlingi andPseudocrenilabrus philander) were studied in Lake Kariba, a very large African man-made lake. They are of no economic importance but make up about 14% and 7% respectively of the inshore fish population and are the major components of the diet of fish-eating birds on the lake.P. darlingi isthe larger species (L = 156.5 mm) and is found on both shelving and steep, eroding shores. Its mortality rate differs in each habitat (Z = 0.44 and 0.72 month−1 respectively), only 0.79% survive for 12 months and its % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiuaiaac+% cadaqdaaqaaiaadkeaaaaaaa!384D!\[P/\overline B \] ratio is 5.45 (on shelving shores).Ps. philander is smaller (L = 83.9 mm) and is restricted to shelving areas with abundant vegetation. Its monthly mortality rate was high (Z = 7.69), only 0.05% survive to 12 months whilst its % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiuaiaac+% cadaqdaaqaaiaadkeaaaaaaa!384D!\[P/\overline B \] ratio was very high (7.69). The estimates of growth obtained forP. darlingi differ considerably from those given in an earlier study in Lake Kariba and some possible reasons for this are discussed. In suitable habitats, the combined production of both species could be 40 kg ha−1 yr−1 which indicates their potential importance to the ecology of the lake.

Key words

Cicjlidae Pharyngochromis darlingi Pseudocrenilabrus philander growth mortality production Lake Kariba 

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References

  1. Balon, E. K., 1973. Results of fish population size assessments in Lake Kariba coves (Zambia), a decade after their creation. Geophys. Monogr. Ser. 17: 149–158.Google Scholar
  2. Balon, E. K. & E. M. Chadwick, 1974. Time of annulus inception: a pond experiment. In E. K. Balon & A. G. Coche (eds). Lake Kariba: a man-made tropical ecosystem in central Africa, pp. 643–646. Dr W Junk, The HagueGoogle Scholar
  3. Balon, E. K. & E. D. Muyanga, 1974. The Darling's Dwarf BreamHaplochromis darlingi (Boulenger, 1911). In E. K. Balon & A. G. Coche (eds). Lake Kariba: a man-made ecosystem in central Africa p. 419–427. Dr W Junk, The Hague.Google Scholar
  4. Bell-Cross, G. & J. L. Minshull, 1988. The fishes of Zimbabwe. Trustees of National Museums and Monuments of Zimbabwe. Harare. 294 pp.Google Scholar
  5. Birkhead, M. E., 1978. Some aspects of the ecology of the Reed Cormorant and Darter on Lake Kariba, Rhodesia. Ostrich 34: 2–26.Google Scholar
  6. Bowmaker, A. P., 1973. Hydrophyte dynamics in Mwenda Bay, Lake Kariba. Kariba Studies (3): 42–59.Google Scholar
  7. Chapman, D. W., 1968. Production. In W.E. Ricker (ed.). Methods for the assessment of fish production in fresh waters p. 182–196. IBP Handbook 3. Blackwell, Oxford.Google Scholar
  8. de Bout, A. F., 1967. Some aspects of age and growth of fish in temperate and tropical waters. In S. D. Gerking (ed.). The biological basis of freshwater fish production, pp. 67–88. Blackwell, Oxford.Google Scholar
  9. Donnelly, B. G. & K. Hustler, 1986. Notes on the diet of the Reed Cormorant and Darter on Lake Kariba during 1970 and 1971. Arnoldia Zimbabwe 9: 319–324.Google Scholar
  10. Fagade, S. O., 1974. Age determination inTilapia melanotheron (Ruppell) in the Lagos Lagoon, Nigeria, with a discussion of the environmental and physiological basis of growth markings in the tropics. In T. B. Bagenal (ed.). The ageing of fish, pp. 71–77. Unwin Brothers, Old Woking, England.Google Scholar
  11. Freeman, B. J. & M. C. Freemen, 1985. Production of fishes in a subtropical blackwater ecosystem: the Okefenokee swamp. Limnol. Oceanogr. 30: 686–692.Google Scholar
  12. Fryer, G. & T. D. Iles, 1972. The cichlid fishes of the great lakes of Africa. Oliver & Boyd, Edinburgh. 641 pp.Google Scholar
  13. Greenwood, P. H., 1974. The cichlid fishes of Lake Victoria: the biology and evolution of a species-flock. Bull. Brit. Mus. nat. Hist. (Zool.) Suppl. 6: 1–134.Google Scholar
  14. Jackson, P. B. N., 1961a. Ichthyology: the fishes of the Middle Zambezi. Kariba Studies (1): 1–36.Google Scholar
  15. Jackson, P. B. N., 1961b. The impact of predation, especially by the tigerfish (Hydrocyon vittatus Cast.). on African freshwater fishes. Proc. zool. Soc. Lond. 136: 603–622.Google Scholar
  16. Jubb, R. A., 1967. Freshwater fishes of southern Africa. A A Balkema, Cape Town. 248 pp.Google Scholar
  17. Kenmuir, D. H. S., 1973. The ecology of the tigerfish,Hydrocynus vittatus Castelnau, in Lake Kariba. Occ. Pap. Nat. Mus. Mon. Rhod. ser. B. 5: 115–170.Google Scholar
  18. Leveque, C., J-R. Durand & J-M. Ecoutin, 1977. Relations entre le rapportP/262 et la longevite des organismes. Cah. ORSTOM (ser Hydrobiol.) 11: 17–31.Google Scholar
  19. Lowe-McConnell, R. H., 1982. Tilapias in fish communities. In R. S. V. Pullin & R. H. Lowe-McConnell (eds). The biology and culture of tilapias p. 83–113. ICLARM, Manila.Google Scholar
  20. Maar, A., 1960. Introductory checklist of fish of the Zambeze subregion of the Ethiopian region. Proc. 1st. Fed. Sci. Congr., Salisbury, 18–22 May 1960, p. 339–346. Rhodesia Scientific Association, Salisbury.Google Scholar
  21. Mahon, R. & E.K. Balon, 1977. Fish production in Lake Kariba, reconsidered. Envir. Biol. Fishes 1: 215–218.Google Scholar
  22. Marshall, B. E., 1987. Growth and mortality of the introduced Lake Tanganyika clupeid, Limnothrissa miodon, in Lake Kariba. J. Fish Biol. 31: 603–615.Google Scholar
  23. Marshall, B. E. & C. A. Lockett, 1976. Juvenile fish populations in the marginal areas of Lake McIlwaine, Rhodesia. J. Limnol. Soc. sthn. Afr. 2: 37–42.Google Scholar
  24. Mitchell, D. S., 1969. The ecology of vascular hydrophytes in Lake Kariba. Hydrobiologia 33: 448–464.Google Scholar
  25. Mitchell, S. A., 1976. The marginal fish fauna of Lake Kariba. Kariba Studies (8): 109–162.Google Scholar
  26. Moreau, J., C. Bambino & D. Pauly, 1986. Indices of overall growth performance in 100 tilapia (Cichlidae) populations. In J. L. Maclean, L. B. Dison & L. V. Hosillos (eds). The first Asian Fisheries Forum p. 201–206. Asian Fisheries Society, Manila.Google Scholar
  27. O'Hara, K. & T. Penczak, 1987. Production of the Threespined Stickleback,Gasterosteus aculeatus L., in the River Weaver, England. Freshwat. Biol. 18: 353–360.Google Scholar
  28. Pauly, D., 1983. Some simple methods for the assessment of tropical fish stocks. FAO Fish. Tech. Pap. (234): 1–54.Google Scholar
  29. Ribbink, A. J., B. A. Marsh, A. C. Marsh, A. C. Ribbink & B. J. Sharp, 1983. A preliminary survey of the cichlid fishes of rocky habitats in Lake Malawi. S. Afr. J. Zool. 18: 149–310.Google Scholar
  30. Tanaka, S., 1962. A method of analysing a polymodal frequency distribution of the porgy,Taius tumifrons (T&S). J. Fish. Res. Bd. Can. 19: 1143–1159.Google Scholar
  31. Trewavas, E., 1983. Tilapiine fishes of the generaSarotherodon, Oreochromis andDanakilia. British Museum (Natural History), London.Google Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • K. Hustler
    • 1
  • B. E. Marshall
    • 2
  1. 1.University Lake Kariba Research StationKaribaZimbabwe
  2. 2.Department of Biological SciencesUniversity of ZimbabweMount Pleasant, HarareZimbabwe

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