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Environmental Biology of Fishes

, Volume 61, Issue 3, pp 261–268 | Cite as

Growth of the Annual Fish, Cynolebias Viarius (Cyprinodontiformes), in the Natural Habitat Compared to Laboratory Conditions

  • Adriana Errea
  • Eva Danulat
Article

Abstract

For the first time, growth throughout the life cycle of an annual fish, Cynolebias viarius, was assessed in the wild, within a temporary pool located in eastern Uruguay. Before pools dry out at the beginning of the warm season, C. viarius deposit eggs in the sediment. Embryos hatch when precipitation fills the pools again in March–April. During 1996, at biweekly or monthly intervals, environmental conditions were monitored and the length of 20 to 55 C. viarius measured. Pool size varied between 109 and 475 m2, respectively. Water depth at its center reached between 10 (June) and 35 cm (September). Water temperatures ranged from 6°C in June to 28.8°C in November. The water was slightly acidic (pH = 6.3 ± 0.2) and subsaturated with O2 (48–88%); conductivity averaged 258 ± 39 μS cm−1. On the first field trip after inundation (May 2), mean length of C. viarius was 9.9 ± 1.0 mm. Maximum growth rate (0.66 mm per day) was determined during the following two-week-interval and was associated with relatively high water temperatures (20–22°C). While fish length remained virtually unchanged during the colder winter months, C. viarius manifested growth, specially in weight, during the last third of the life cycle. Fish were sexually mature at 8 (67%) to 18 (100%) weeks of age. In the laboratory, specimens held at 25°C grew faster and reached sexual maturity at an earlier age (11 weeks) than at 15°C (10–16 weeks). Over the 5-months study period, mortality reached 37.5% at 15°C and 100% at 25°C. Results are compared to information available from other annual fishes.

killifishes life cycle temperature environmental conditions teleosts temporary pool endemic to Uruguay 

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References

  1. Amato, L.H. 1986. Seis especies nuevas del g´enero Cynolebias Steindachner, 1876, de Uruguay y Paraguay (Cyprinodontiformes, Rivulidae). Comunicaciones Zool´ogicas del Museo de Historia Natural de Montevideo 11(162): 1–27.Google Scholar
  2. Brett, J.R. 1979. Environmental factors and growth. pp. 599–675. In: W. S. Hoar & D. J. Randall (ed.) Fish Physiology, Vol. XI A, Academic Press, New York.Google Scholar
  3. Costa, W.J.E.M. 1995. Pearl killifishes. The Cynolebiatinae. Systematics and biogeography of a neotropical annual fish subfamily (Cyprinodontiformes: Rivulidae). T.F.H. Publications, Inc., Neptune, 128 pp.Google Scholar
  4. Grasshoff, K. 1983. Determination of oxygen. pp. 61–72. In: K. Grasshoff, M. Ehrhardt & K. Kremling (ed.) Methods of Seawater Analysis, 2nd ed., Verlag Chemie, Basel.Google Scholar
  5. Lagomarsino, F., R. Rodríguez, J. Rudolf, R. Spinola & F. Rilla. 1988. Area RAMSAR del Uruguay. Desarrollo o destrucción? Revista de Medio Ambiente (Chile) 9: 63–77.Google Scholar
  6. Liu, R.K. & R.L. Walford. 1966. Increased growth and lifespan with lowered ambient temperature in the annual fish, Cynolebias adloffi. Nature 212(5067): 1277–1278.Google Scholar
  7. Liu, R.K. & R.L. Walford. 1969. Laboratory studies on life-span, growth, aging, and pathology of the annual fish Cynolebias bellottii Steindachner. Zoologica 54: 1–16.Google Scholar
  8. Nelson, J.S. 1994. Fishes of the World, 3rd ed. Wiley & Sons, New York. 600 pp.Google Scholar
  9. Peters, N. 1963. Embryonale Anpassungen oviparer Zahnkarpfen aus periodisch austrocknenden Gewässern. Int. Rev. ges. Hydrobiol. 48: 257–313.Google Scholar
  10. Ricker, W.E. 1979. Growth rates and models. pp. 677–743. In: W. S. Hoar, D. J. Randall & J. R. Brett (ed.) Fish Physiology: Bioenergetics and Growth, Vol. 8, Academic Press, London.Google Scholar
  11. Smith, L.S. & G.R. Bell. 1967. Anesthetic and surgical techniques for Pacific salmon. J. Fish. Res. Board Can. 24: 1579–1588.Google Scholar
  12. Simpson, B.R.C. 1979. The phenology of annual killifishes. pp. 243–261. In: P. J. Miller (ed.) Fish Phenology: Anabolic Adaptiveness in Teleosts, Symposium of the Zoological Society of London 44, Academic Press, London.Google Scholar
  13. Sokal, R.R. & F.J. Rohlf. 1981. Biometry, 2nd ed. W. H. Freeman and Company, New York. 859 pp.Google Scholar
  14. Vaz Ferreira, R. & B. Sierra. 1971. Especies del género Cynolebias Steindachner, 1876, en el Uruguay. Boletín de la Sociedad Zoológica del Uruguay 1: 24–44.Google Scholar
  15. Vaz Ferreira, R. & B. Sierra. 1973. Caracteres etológicos, genéricos y específicos en los peces del género Cynolebias Steindachner, 1876. Boletín de la Sociedad Zoológica del Uruguay 2: 22–35.Google Scholar
  16. Vaz Ferreira, R. & A.R. Melgarejo. 1984. La distribución de las especies del género Cynolebias Steindachner, 1876, en el Uruguay, con notas sobre C. alexandri Castello y López, 1974. Boletín de la Sociedad Zoológica del Uruguay (segunda época): 41–46.Google Scholar
  17. Vaz Ferreira, R., B. Sierra de Soriano & J. Soriano Señorans. 1966. Integración de la fauna de vertebrados en algunas masas de agua dulce temporales del Uruguay. Compendios de Trabajo del Departamento de Zoología Vertebrados de la Facultad de Humanidades y Ciencias 25, Universidad de la República, Montevideo. 23 pp.Google Scholar
  18. Walford, R.L. & R.K. Liu. 1965. Husbandry, life span and growth rate of the annual fish, Cynolebias adloffi E Ahl. Exp. Geront. 1: 161–171.Google Scholar
  19. Wourms, J.P. 1972a. Developmental biology of annual fishes I. Stages in the normal development of Austrofundulus myersi Dahl. J. Exp. Zool. 182: 143–168.Google Scholar
  20. Wourms, J.P. 1972b. The developmental biology of annual fishes. II. Naturally occurring dispersion and reaggregation of blastomeres during the development of annual fish eggs. J. Exp. Zool. 182: 169–200.Google Scholar
  21. Wourms, J.P. 1972c. The developmental biology of annual fishes. III. Pre-embryonic and embryonic diapause of variable duration in eggs of annual fishes. J. Exp. Zool. 182: 389–414.Google Scholar

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Adriana Errea
    • 1
  • Eva Danulat
    • 1
  1. 1.Facultad de CienciasUniversidad de la RepúblicaMontevideoUruguay

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