Feeding and growth rates for triploid grass carp as influenced by size and water temperature

    Authors

    J. A. Osborne;R. D. Riddle

    Comments

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    Abbreviated Journal Title

    J. Freshw. Ecol.

    Keywords

    Ecology; Limnology

    Abstract

    Thirty feeding trials were conducted using triploid grass carp (Ctenopharyngodon idella Val.) fed hydrilla (Hydrilla verticillata Royle) to establish feeding and growth rates as a function of fish size and water temperature. Size of fish ranged from 0.2 to 9.1 kg and water temperatures ranged from 17 to 27 C. Feeding trials consisted of fish and hydrilla housed in 4 m(3) wire mesh cages suspended at weekly intervals in an experimental pond. Utilizing pre- and post-weights of fish and hydrilla, weight gain, relative and absolute feeding rates, and feeding efficiency were found to increase with increasing water temperatures. Relative and absolute feeding rates for 0.2 - 0.4 kg fish at 17 C were approximately 25% of that for similar sized fish at 27 C. Above 25 C, these small fish consumed their body weight per day of hydrilla. While relative feeding rates (gm hydrilla/gm fish/day) declined with increase in fish size (at constant temperature), this was not the pattern for absolute feeding rates (gm hydrilla/fish/day) where consumption rates ranged from 750 to 1200 gm hydrilla/day for fish weighing more than 1 kg.

    Journal Title

    Journal of Freshwater Ecology

    Volume

    14

    Issue/Number

    1

    Publication Date

    1-1-1999

    Document Type

    Article

    Language

    English

    First Page

    41

    Last Page

    45

    WOS Identifier

    WOS:000079013100004

    ISSN

    0270-5060

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