A BIOLOGICAL SURVEY OF THE FISHES OP SHIRORO LAKE; NIGER STATE, NIGERIA.
A BIOLOGICAL SURVEY OF THE FISHES OP SHIRORO LAKE; NIGER STATE, NIGERIA.
No Thumbnail Available
Date
1989-05
Authors
ZINZE, ADAMU WAKILI
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
ABSTRACT
A biological survey of fish species in Shiroro Lake, Niger
State was conducted between April 1987 and March 1988. The
specimens were bought from the fishermen at three villages
located around the lake. Information from the fishermen showed
that the methods of capture were by gill nets, hook and line,
fi3h traps and fences.
A total of 1,38U specimens of fish from 13 families comprising
22 genera and 31 species were studied. Most of the species were
immature, of one age group and were in good condition throughout
the period of investigation.
Growth in Brycinus nurse and Oreochromis niloticus was
observed to be isometric and negative allometric respectively.
Eight species viz: Labeo senegalensis, Auchenoglanis occidentalis,
Schilbe uranoscopus, Clarias gariepinus, Malapterurus electricus,
Lates niloticus, Sarotherodon galllaeus and Tilapia zilli showed
positive allometric growth.
The fishes exhibited differences in the dietary items
selected. Most of them were found to be predators, feeding mainly
on fish, insects,crustaceans and molluscs.
There were significant differences (P<0.05) between the
observed and the expected sex ratio of Schilbe uranoscopus and
Hemichromi8 bimaculatus. For most of the species, the sex ratio
was approximately 1:1.
Description
A THESIS SUBMITTED IN PARTIAL FULFILMENT OP THE REQUIREMENTS FOR THE DEGREE Of MASTER OF SCIENCE IN FISHERIES
Keywords
BIOLOGICAL, SURVEY, FISHES, SHIRORO LAKE, NIGER STATE, NIGERIA.