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Use of Carbopol resin for carp pituitary administration improves the fertilization percentage of northern pike (Esox lucius Linnaeus) eggs in commercial hatcheries

  • INTERNATIONAL PIKE SYMPOSIUM
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Abstract

The efficiency of northern pike (Esox lucius Linnaeus) fry production via hormonal treatment of wintered broodstock is, in general, relatively low due to low egg fertilization percentage. It has been experimentally demonstrated that administration of acetone-dried carp pituitary extract in a slow-release vehicle of aqueous dispersion of Carbopol 971 P resin (CP) resulted in a higher mean fertilization percentage, possibly because the gradual hormone action could optimally control ovarian follicle maturation and ovulation. This new method of hormonal induction of ovulation was tested in a large-scale hatchery production of northern pike fry. In the present study, data on fertilization percentage collected between 2002 and 2006 at two prominent hatcheries in Hungary were analyzed. Administration of acetone-dried carp pituitary in a 2.5% CP vehicle resulted in higher fertilization (76.4 ± 7.7%; mean ± SD) compared to the saline vehicle group (59.3 ± 10.8%). The vehicle used did not affect the ovulation ratio. According to these results from large-scale production, the new method could be suitable to have wide application for induced breeding of northern pike.

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Acknowledgments

The presentation of this work at the International Northern Pike Symposium in Lake Placid NY, September 10–14, 2006 was supported by the grant to the author from the Agency for Research Fund Management and Research Exploitation (KPI) (OMFB-01047/2006). The author would like to thank Janice Burke (Faculty of Forestry and the Forest Environment, Lakehead University, Thunder Bay, Ontario, Canada) for her assistance in checking the manuscript for English language use.

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  1. Department of Fish Culture, Szent István University, Páter K. u. 1, Gödöllő, 2103, Hungary

    Tamás Szabó

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  1. Tamás Szabó
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Correspondence to Tamás Szabó.

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Guest editors: J. M. Farrell, C. Skov, M. Mingelbier, T. Margenau & J. E. Cooper

International Pike Symposium: Merging Knowledge of Ecology, Biology, and Management for a Circumpolar Species

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Szabó, T. Use of Carbopol resin for carp pituitary administration improves the fertilization percentage of northern pike (Esox lucius Linnaeus) eggs in commercial hatcheries. Hydrobiologia 601, 91–97 (2008). https://doi.org/10.1007/s10750-007-9269-9

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