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Feeding behaviour of underyearling hybrids of the grass carp, Ctenopharyngodon idella ♀ and the bighead, Hypophthalmicthys nobilis ♂ on selected species of aquatic plants
Author(s) -
Cassani J. R.
Publication year - 1981
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1981.tb02809.x
Subject(s) - biology , hydrilla , pistia , grass carp , ceratophyllum demersum , stratiotes , bighead carp , botany , aquatic plant , eichhornia crassipes , myriophyllum , hydrocharitaceae , lemna , macrophyte , fishery , ecology , silver carp , fish <actinopterygii>
Underyearling hybrids of the cross Ctenopharyngodon idella ♀ (grass carp) and Hypophthalmichthys nobilis ♂ (bighead), averaging 104.8 mm total length were stocked for two weeks in cement tanks holding 605 1 of water with various combinations of submersed or floating aquatic plants. The submersed species most preferred were Ceratophyllum demersum, Chara sp. and Najas guadalupensis. Hydrilla verticillata, Hygrophila polysperma, Myriophyllum pinnatum and Utricularia foliosa were fed on from a minor to moderate extent. No feeding damage was observed on Egeria densa and Potamogeton illinoensis. Azolla caroliniana, Lemna sp. and Wolffia columbiana were readily consumed while Salvinia rotundifolia was not preferred when in combination with these floating plant species. Feeding damage to the submersed roots of Eichhornia crassipes and Pistia stratiotes was minor during a 30 day period. Hybrid fingerlings readily fed on mosquito larvae and small leeches when offered to them in an aquarium on one occasion.