PAPER TITLE :MORPHOLOGICAL VARIATION IN OREOCHROMIS NILOTICUS USING MORPHOLOGICAL INDICES IN THREE POPULATIONS

JOURNAL Of SUSTAINABLE TECHNOLOGY | VOLUME 11 NUMBER 1 2021

Paper Details

  • Author(s) : Popoola, O. Michael and Akintoye, A. David
  • Abstract:

This study provides foundational information in terms of genetic variation and
morphology of O. niloticus in three water bodies in the south-western region of Nigeria. A total of
one hundred and nine individual samples of Oreochromis niloticus were obtained from the study
locations for morphological studies. The study indicated that there was a high morphological
variation in the fish from all locations and that, not all the morphological features of O. niloticus in
the study areas contributed significantly to the variations observed. The PCA loadings for the entire
region showed that the head height (HH) is the character that contributed most to the variance
observed in the study. The scatter diagram, using 95% sensitivity, indicated that fish samples from
Awara and Egbe reservoirs have morphometric features that are more related than those from Ogbese
River as confirmed by Mann-Whitney U-test. The result from the PCA of meristic characters was
different, the measured characters did not vary within the same population except scales count on
two samples from Ogbese River. The observed variation in the meristic characters occurred mostly
within the entire region. The results from the study indicated that the reservoirs have more diversified
O. niloticus.


Keywords: Morphology; Morphometrics; Meristics; Oreochromis niloticus; Nile Tilapia