Morphometric and Meristic Characteristics of Hybrid Catfish from Selected Fish Farms in Southern Nigeria

 
 
International Journal of Biotech Trends and Technology (IJBTT)
 
© 2015 by IJBTT Journal
Volume - 5 Issue - 1                          
Year of Publication : 2015
Authors : Umoh, I. A., Nlewadim, A. Obuba, L. E, Oguntade, O. R.

Umoh, I. A., Nlewadim, A.Obuba, L. E, Oguntade, O. R. "Morphometric and Meristic Characteristics of Hybrid Catfish from Selected Fish Farms in Southern Nigeria", International Journal of Biotech Trends and Technology (IJBTT), V5(1):14-19 Jan - Mar 2015, Published by Seventh Sense Research Group.

Abstract

Morphological and meristic characters of hybrid clariid catfish from selected fish farms in Abia and Akwa-Ibom states were investigated. Ten juveniles of the hybrid clariid catfish were obtained from each of the farms to give a total of forty. Thirty morphometric and meristic characters were measured. The data obtained were subjected to different statistical techniques. Analysis of variance (ANOVA) at P≤0.05 showed that dorsal fin ray number was significant in Abia 1 (53.79) than Abia 2 (48.05), Akwa Ibom 1 (49.04) and Akwa Ibom 2 (47.00). Adipose fin length which is a major distinguishing character among “Hetero x Clarias” hybrid were observed to have varying proportions among the farms with Abia 2 having a significant length of 9.8cm followed by Abia 1 (8.09cm), Akwa Ibom 1(6.12cm) and Akwa Ibom 2 having the least (3.32cm). Pearson’s correlation coefficient matrix showed that adipose fin length (r=0.89, P≤0.04) is dependent on dorsal fin length which is the usual trend in Heterobranchus spp. These characters were further subjected to a multivariate statistical technique (principal component analysis) to ascertain the characters that account for the variations. The Principal component analysis showed that principal component 1 and 11 with Eigen values 22.81 and 3.01 respectively accounted for 91.75% of the total variance in the data set. In addition, the PCA biplot revealed that the hybrids differed meristically and the characters accounting for these are; pectoral fin-ray, caudal finray, anal fin-ray, dorsal fin-ray, pelvic fin-ray, eye diameter, anal fin height, weight and body depth at anus.

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Keywords
Morphometric, meristic, characters