Hydrobiologia

, Volume 200, Issue 1, pp 567–579 | Cite as

The effects of planktivorous fishes on the plankton community in a eutrophic lake

  • T. Miura
Part Eight: Management

Abstract

Stocking silver carp, a phytoplankton feeder, and bighead carp, an omnivorous plankton feeder, into an eutrophic lake at high densities caused a dramatic change in the lake ecosystem.Microcystis, which had been dominant in summer and a main food of the fishes decreased markedly, and green algae smaller than 10 µm then became dominant. Consequently, chlorophyll-a per unit area decreased slightly, while the rate of production was higher than that in the previous years. As the total density of the fishes increased (from 0.09 to 0.11 fish m−2), the growth of silver carp was retarded, while that of bighead carp increased.Microcystis, was unable to become dominant due to increased grazing pressure by the fishes, and small green algae became dominant. The lake conditions thus became more favourable for zooplankters which selectively consumed small green algae, and accordingly, the production of zooplankton rose. Bighead carp consumed more animal food, which they assimilate at a higher rate than plant food, and grew better in spite of the fact that the fish density increased. The feeding rate of silver carp was greatly reduced because the green algae were too small to ingest, and the fish therefore grew poorly. Results of a computer simulation of a model consisting of five compartments, representing the blue-green algae, green algae, zooplankton, silver and bighead carp, support the food-web change observed in the lake.

Key words

eutrophic lake fish plankton feeders silver carp bighead carp food web dynamics algal change biomanipulation 

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References

  1. Benndorf, J., H. Kneschke, K. Lossatz & E. Penz, 1984. Manipulation of the pelagic food web by stocking with predacious fishes. Int. Revue ges. Hydrobiol. 69: 407–428.Google Scholar
  2. Carpenter, S. R., J. F. Kitchell, J. R. Hodgson, P. A. Cochran, J. J. Elser, M. M. Elser, D. M. Lodge, D. Kretchmer, X. He & C. N. von Ende, 1987. Regulation of lake primary productivity by food web structure. Ecology 68: 1863–1876.CrossRefGoogle Scholar
  3. Chen, S., 1982. Food habit analysis of silver carp and bighead carp stocked in Donghu (East Lake). Shuiku Yuye (Reservoir Fishery) 3: 21–26.Google Scholar
  4. Chen, S., in press. Fishes and their roles on the material cycle in the lake. In J. Liu (ed.), Ecological studies on Donghu (East Lake).Google Scholar
  5. Chen, X., 1985. A preliminary study of biomass and production of Copepoda in Lake Donghu, Wuhan. Acta Hydrobiol. Sinica 9: 144–158.Google Scholar
  6. Higashi, M., T. Miura & Q. Cai, 1989. Ecosystem dynamics of the East Lake: Mathematical modelling and theoretical analysis. In T. Miura (ed.), East Lake. A phytoplanktivorous fishes dominated lake ecosystem: 127–140.Google Scholar
  7. Huang, X. & C. Hu, 1984. Population dynamics and production ofDaphnia hyalina andDaphnia carinata ssp. in Donghu Lake, Wuhan. Acta Hydrobiol. Sinica 8: 405–417.Google Scholar
  8. Iwata, K., S. Chen & X. Liu, 1989. Estimation of several parameters in relation to nitrogen balance of silver carp and bighead carp. In T. Miura (ed.), East Lake. A phytoplanktivorous fishes dominated lake ecosystem: 64–80.Google Scholar
  9. Konagaya, T. & Q. Cai, 1987. Telemetering of the swimming movements of silver and bighead carp. Jap. J. Sci. Fish. 53: 705–709.Google Scholar
  10. Konagaya, T. & Q. Cai, 1989. Telemetric determination of the swimming activities of silver and bighead carp. In T. Miura, (ed.), East Lake. A phytoplanktivorous fishes dominated lake ecosystem: 40–61.Google Scholar
  11. Lampert, W., 1984. Chapter 10. The measurement of respiration. In J. A. Downing & F. H. Rigler (ed.), A manual on methods for the assessment of secondary productivity in fresh waters. Second edition. Blackwell, London: 413–468.Google Scholar
  12. Li, Q. & Q. Shen, in press. Bacteria. In J. Liu (ed.), Ecological studies on Donghu (East Lake), Wuhan.Google Scholar
  13. Lin, W. & X. Liu, 1985. Elementary composition of some dominant zooplankters in Lake Donghu, Wuhan. Acta Hydrobiol. Sinica 9: 258–263.Google Scholar
  14. Liu, H., H. Xie, S. Huang, G. Huang & B. Deng, 1982. On the scale annuli formation of silver and bighead carp in Lake Donghu, with special reference to the problem of rational size of ‘seedlings’ at the time of stocking. Jour. Fisheries China 6: 129–137.Google Scholar
  15. Liu, J., 1984. Lakes of the middle and lower basins of the Chang Jiang (China). In F. B. Taub (ed.), Lakes and reservoirs. Elsevier Sci. Publ. B. V., Amsterdam: 331–355.Google Scholar
  16. Miura, T. & J. Wang, 1985. Chlorophylla found in feces of phytoplanktivorous cyprinids and its photosynthetic activity. Verh. int. Ver. Limnol. 22: 2636–2642.Google Scholar
  17. Miura, T. & S. Chen, 1989. Nitrogen flow in a subsystem formed by planktivorous fishes, phytoplankton and zooplankton. In T. Miura (ed.), East Lake. A phytoplanktivorous fishes dominated lake ecosystem: 116–126.Google Scholar
  18. Miura, T. & Z. Zhu, 1986. The interaction between phytoplankton and silver carp in Donghu (East Lake). — A quantitative evaluation of the interaction. Acta Hydrobiol. Sinica 10: 201–207.Google Scholar
  19. Miura, T., Z. Zhu & K. Tatsukawa, 1989. Growth of silver and bighead carp in East Lake. In T. Miura (ed.), East Lake. A phytoplanktivorous fishes dominated lake ecosystem: 32–37.Google Scholar
  20. Shapiro, J. & D. I. Wright, 1984. Lake restoration by biomanipulation: Round Lake, Minnesota, the first two years. Freshwat. Biol. 14: 371–383.CrossRefGoogle Scholar
  21. Tatsukawa, K., Z. Zhu & T. Miura, 1989. Acoustic estimation of fish population in East Lake. In T. Miura (ed.), East Lake. A phytoplanktivorous fishes dominated lake ecosystem: 14–30.Google Scholar
  22. Wang, J. (Ji), in press (a). Primary productivity of phytoplankton. In J. Liu (ed.), Ecological studies on Donghu (East Lake), Wuhan.Google Scholar
  23. Wang, J. (Jian), in press (b). Phytoplankton. In J. Liu (ed.), Ecological studies on Donghu (East Lake), Wuhan.Google Scholar
  24. Wang, J. Ji & G. Shen, 1981. The primary production of the phytoplankton of Lake Donghu and its correlation with various ecological factors. Acta Hydrobiol. Sinica 7: 295–310.Google Scholar
  25. Wetzel, R. G., 1975. Limnology. Saunders, Philadelphia, 743 pp.Google Scholar
  26. Winberg, G. G. & A. Duncan, 1971. Methods for the estimation of production of aquatic animals. Academic Press, London & New York, 175 pp.Google Scholar
  27. Xu, R. L., 1988. Studies on the productivity of planktonic protozoa in East Lake, Wuhan. Master thesis, Inst. Hydorobiol., Academia Sinica, 103 pp.Google Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • T. Miura
    • 1
  1. 1.Otsu Hydrobiological StationKyoto UniversityOtsuJapan

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