DSpace Collection:http://repository.fuoye.edu.ng:80/handle/123456789/9282026-04-16T23:22:34Z2026-04-16T23:22:34ZMORPHOLOGICAL AND MOLECULAR DIFFERENTIATION IN TILAPINE GROUP FROM TWO WATER BODIES IN EKITI STATEAROWOLO, TEJUMOLA WEMIMOhttp://repository.fuoye.edu.ng:80/handle/123456789/11982016-05-09T12:01:11Z2015-10-01T00:00:00ZTitle: MORPHOLOGICAL AND MOLECULAR DIFFERENTIATION IN TILAPINE GROUP FROM TWO WATER BODIES IN EKITI STATE
Authors: AROWOLO, TEJUMOLA WEMIMO
Abstract: Morphological variation of the cichlid fishes Oreochromis niloticus and Sarotherodon
galileaus from two hydrologically distinct localities in the Ekiti state, Southern Nigeria was
studied. Morphometric and meristic analyses were conducted on 50 specimens each of
Oreochromis niloticus, Sarotherodon galilaeus and in each water body by measuring ten
morphometric characters and ten meristic counts. The data were analysed using stepwise
discriminant analysis, multivariate analysis of variance(MANOVA)and univariate analysis
of variance(ANOVA) after allometric test. Biochemical variations were also assessed by the
Random Amplified Polymorphic DNA-Polymerase Chain Reaction (RAPD-PCR)using six
random 10-mer primers in 10 individuals from each of the two locations. Primers which gave
polymorphism were selected. The result of stepwise discriminant analysis on morphometric
and meristic features revealed observable degrees of variability among stocks in each species.
However, features that are responsible for this variability were found to differ among species.
In O. niloticus, body weight (0.645), body depth(0.486)and snout length (0.417)were
responsible for differentiations. While in S. galilaeus body depth (0.436)eye diameter(0.344)and caudal peduncle were responsible for differentiations .The result
further revealed a high degree of dissimilarity among populations of each species studied
indicating that the tilapias in each water body represent different aggregations. Stepwise
analyses showed that the overall random assignment of individuals into the original group
was found to be high and varying among the species by 90% and 95 % in O. niloticus, and S.
galilaeus respectively. Multivariate analysis of variance
of variance
from the two water bodies
Ero population for S. galilaeusbut slightly dissimilarity for O. niloticus. The heterogenecity
iii
in Ero and Ureje populations might be due to the limited human interference from the stock
exploitation, pollution and different hydrological conditions.2015-10-01T00:00:00Z