Title

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

Authors

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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