SOME ASPECTS OF THE BIOLOGY OF TWO MEMBERS OF THE FAMILY CICHLIDAE IN KADUNA RIVER, NIGERIA
SOME ASPECTS OF THE BIOLOGY OF TWO MEMBERS OF THE FAMILY CICHLIDAE IN KADUNA RIVER, NIGERIA
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Date
2014-02-11
Authors
ABUBAKAR, KOTOS ABDURAHAMAN
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Abstract
Investigation into some aspects of the biology of
Oreochromis niloticus (Peters) and Tilapia zillii (Gervais)
were conducted between August 1966 and July 1967.
Samples were obtained twice monthly during the period
of the investigation from River Kaduna.
The standard length of males 0. niloticus ranged
from 6.5 to 26.0 cm while that of ferales ranged from
6.6 to 25.7 cm. The weight of the males varied between
11.0 to 592.1g while that of females varied between
29.0 to 593g. In T. zillii the standard length of males
ranged from 7.0 to 23.0 cm while that, of females ranged
from 9.0 to 21.8 cm. The weight of males varied between
16.0 to 480.5 gm while that of females varied between
13.0 to 240g.
The length-weight regression analysis indicated
negative allometric growth for both species. The mean
condition factors for both species were found to be
good throughout the period of investigation except, in the
months of January and February where there were general
fall in conditions.
The fishes exhibited diverse feeding habits. 0.
niloticus fed more on algae and diatoms than T. zillii
which fed almost exclusively on higher aquatic plants.
Chi-square test revealed that the sex ratio of
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2- niloticus did not deviate from the expected 1:1 ratio.
In T. zillii there were more males than females.
Description
THESIS SUBMITTED TO THE POST GRADUATE
SCHOOL, AHMADU BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILMENT OF THE REQUIREMENTS
FOR THE DEGREE OF
"MASTER OF SCIENCE IN FISHERIES
Keywords
ASPECTS, BIOLOGY, TWO, MEMBERS, FAMILY, CICHLIDAE, KADUNA, RIVER, NIGERIA