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Spawning behaviour and mating success in hybrids of silver bream ( Blicca bjoerkna L.) and rudd ( Scardinius erythrophthalmus L.) in an experimental environment

Spawning behaviour and mating success in hybrids of silver bream ( Blicca bjoerkna L.) and rudd (... The egg-release, mating, courting and aggressive acts for the spawning behaviour as well as the survival rates after spawning at stages of eyed embryos, viable hatchlings, and larvae to dry food consumption for the mating success were studied in cultured silver bream Blicca bjoerkna × rudd Scardinius erythrophthalmus hybrids at their first sexual maturity. Experiments were conducted in experimental environments simulating natural reproductive conditions of the parental species. Spawning behaviour was analysed over 1 day from 8.00 to 18.00 hours using a remote-controlled video. Mating success was assessed from eggs and hatched embryos collected on the spawning ground. The results showed that these hybrids exhibited all the reproductive behaviours of the parental species with significantly more courtship than mating. Each egg-release act was accompanied by mating behaviour, involving all the experimental males. A surprising aggressive behaviour was observed in one male which attacked all other experimental fish. Successful mating resulted in the presence of fertilized eggs, the production of hatched embryos in experiments, and the survival of larvae at the dry food consumption stage. However, the low viable hatchling rate observed could indicate a very low chance of survival for these hybrids in rivers in which the occurrence of post-F1 individuals may be more possible by backcrossing. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Animal Biology Brill

Spawning behaviour and mating success in hybrids of silver bream ( Blicca bjoerkna L.) and rudd ( Scardinius erythrophthalmus L.) in an experimental environment

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Publisher
Brill
Copyright
© Koninklijke Brill NV, Leiden, The Netherlands
Subject
Articles
ISSN
1570-7555
eISSN
1570-7563
DOI
10.1163/15707563-00002399
Publisher site
See Article on Publisher Site

Abstract

The egg-release, mating, courting and aggressive acts for the spawning behaviour as well as the survival rates after spawning at stages of eyed embryos, viable hatchlings, and larvae to dry food consumption for the mating success were studied in cultured silver bream Blicca bjoerkna × rudd Scardinius erythrophthalmus hybrids at their first sexual maturity. Experiments were conducted in experimental environments simulating natural reproductive conditions of the parental species. Spawning behaviour was analysed over 1 day from 8.00 to 18.00 hours using a remote-controlled video. Mating success was assessed from eggs and hatched embryos collected on the spawning ground. The results showed that these hybrids exhibited all the reproductive behaviours of the parental species with significantly more courtship than mating. Each egg-release act was accompanied by mating behaviour, involving all the experimental males. A surprising aggressive behaviour was observed in one male which attacked all other experimental fish. Successful mating resulted in the presence of fertilized eggs, the production of hatched embryos in experiments, and the survival of larvae at the dry food consumption stage. However, the low viable hatchling rate observed could indicate a very low chance of survival for these hybrids in rivers in which the occurrence of post-F1 individuals may be more possible by backcrossing.

Journal

Animal Biology – Brill

Published: Jan 1, 2013

Keywords: Spawning behaviour; mating success; hybrids; fish

References

  • The evolution of polyandry: multiple mating and female fitness in insects
    Arnqvist G. Nilsson T.
  • Multiple mating and reproductive skew in Trinidadian guppies
    Becher S.A. Magurran A.E.
  • Approccio multidisciplinare all’analisi tassonomica del genere Scardinius (Cyprinidae) en Europa
    Bianco P.G. Ketmaier V. Bussato T.
  • The karyology of the cyprinid genera Scardinius and Rutilus in Southern Europe
    Bianco P.G. Aprea G. Balleto E. Capriglione T. Fulgione D. Odierna G.