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Document Type

Research

Keywords

Tilapia, Cichlidae, growth of fish, fish populations

Abstract

Tilapia aurea were introduced in three Iowa ponds with the knowledge that they would not overwinter. Differential growth of the sexes and aggressive behavior interfered with tests on effects of crowding tilapia in pens. Females began reproducing at 31 g in mid-July and offspring were up to 179 mm total length or 82 g in October. Stomachs were usually empty in females brooding eggs, and condition factors were lower for females brooding fry than for other females. Males grew faster and had higher condition factors than females. Yearling tilapia 89-162 mm total length in May, added an average of 0.86 to 2.71 g per day from June 1 to early September in the 3 ponds. In Bailey's Pond, the population in late September was estimated at 1450 kg of black bullheads, 37 kg of channel catfish, and 550 kg of tilapia per hectare.

Publication Date

October 1971

Journal Title

Proceedings of the Iowa Academy of Science

Volume

78

Issue

1-2

First Page

27

Last Page

79

Copyright

© Copyright 1971 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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