Morphological Variation of Four Tilapia Populations in Selected Reservoirs in Sri Lanka

<p>Morphological variation among three populations of introduced Tilapia fish collected from Kurunegala, Anuradhapura and Polonnaruwa and the brood stock of Nile tilapia (<em>Oreochromis niloticus</em>) collected from the Udawalawe tilapia breeding centre was investigated by multiv...

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Main Authors: SP Samaradivakara, NY Hirimuthugoda, RHANM Gunawardana, RJ Illeperuma, ND Fernandopulle, AD De Silva, PABD Alexander
Format: Article
Language:English
Published: Postgraduate Institute of Agriculture, University of Peradeniya 2012-09-01
Series:Tropical Agricultural Research
Subjects:
Online Access:https://tar.sljol.info/articles/4642
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spelling doaj-1a22a0db20f242a3a19ae5decf0242322020-11-25T01:34:20ZengPostgraduate Institute of Agriculture, University of PeradeniyaTropical Agricultural Research1016-14222012-09-0123210511610.4038/tar.v23i2.46423770Morphological Variation of Four Tilapia Populations in Selected Reservoirs in Sri LankaSP Samaradivakara0NY Hirimuthugoda1RHANM Gunawardana2RJ Illeperuma3ND Fernandopulle4AD De Silva5PABD Alexander6Faculty of Veterinary Medicine and Animal Science, University of PeradeniyaFaculty of Agriculture, University of Ruhuna,Faculty of Agriculture, University of Ruhuna,Genetech Research Institute, 54, Kitulwatte Road, Colombo 08,Genetech Research Institute, 54, Kitulwatte Road, Colombo 08,Genetech Research Institute, 54, Kitulwatte Road, Colombo 08,Faculty of Veterinary Medicine and Animal Science, University of Peradeniya,<p>Morphological variation among three populations of introduced Tilapia fish collected from Kurunegala, Anuradhapura and Polonnaruwa and the brood stock of Nile tilapia (<em>Oreochromis niloticus</em>) collected from the Udawalawe tilapia breeding centre was investigated by multivariate analysis of twenty morphometric and fourteen meristic characters. Discriminant analysis and cluster analysis of conventional morphometric measures showed a high divergence among the populations while the conventional meristic measures did not show a divergence among the populations. These results showed that the tested fish samples could be grouped into its respective collection site based on the morphometric characters. The morphometric differences between the populations may have appeared due to either genetic differences or environmental factors. The thirty-four characters, extracted from stepwise discriminant analysis played important roles in morphological differentiation.</p> <p><em>Tropical Agricultural Research Vol. 23 (2): 105-116 (2012)</em></p> DOI: <span style="text-decoration: underline;"><a href="http://dx.doi.org/10.4038/tar.v23i2.4642">http://dx.doi.org/10.4038/tar.v23i2.4642</a></span><p> </p>https://tar.sljol.info/articles/4642meristicsmorphometricsoreochromis niloticus
collection DOAJ
language English
format Article
sources DOAJ
author SP Samaradivakara
NY Hirimuthugoda
RHANM Gunawardana
RJ Illeperuma
ND Fernandopulle
AD De Silva
PABD Alexander
spellingShingle SP Samaradivakara
NY Hirimuthugoda
RHANM Gunawardana
RJ Illeperuma
ND Fernandopulle
AD De Silva
PABD Alexander
Morphological Variation of Four Tilapia Populations in Selected Reservoirs in Sri Lanka
Tropical Agricultural Research
meristics
morphometrics
oreochromis niloticus
author_facet SP Samaradivakara
NY Hirimuthugoda
RHANM Gunawardana
RJ Illeperuma
ND Fernandopulle
AD De Silva
PABD Alexander
author_sort SP Samaradivakara
title Morphological Variation of Four Tilapia Populations in Selected Reservoirs in Sri Lanka
title_short Morphological Variation of Four Tilapia Populations in Selected Reservoirs in Sri Lanka
title_full Morphological Variation of Four Tilapia Populations in Selected Reservoirs in Sri Lanka
title_fullStr Morphological Variation of Four Tilapia Populations in Selected Reservoirs in Sri Lanka
title_full_unstemmed Morphological Variation of Four Tilapia Populations in Selected Reservoirs in Sri Lanka
title_sort morphological variation of four tilapia populations in selected reservoirs in sri lanka
publisher Postgraduate Institute of Agriculture, University of Peradeniya
series Tropical Agricultural Research
issn 1016-1422
publishDate 2012-09-01
description <p>Morphological variation among three populations of introduced Tilapia fish collected from Kurunegala, Anuradhapura and Polonnaruwa and the brood stock of Nile tilapia (<em>Oreochromis niloticus</em>) collected from the Udawalawe tilapia breeding centre was investigated by multivariate analysis of twenty morphometric and fourteen meristic characters. Discriminant analysis and cluster analysis of conventional morphometric measures showed a high divergence among the populations while the conventional meristic measures did not show a divergence among the populations. These results showed that the tested fish samples could be grouped into its respective collection site based on the morphometric characters. The morphometric differences between the populations may have appeared due to either genetic differences or environmental factors. The thirty-four characters, extracted from stepwise discriminant analysis played important roles in morphological differentiation.</p> <p><em>Tropical Agricultural Research Vol. 23 (2): 105-116 (2012)</em></p> DOI: <span style="text-decoration: underline;"><a href="http://dx.doi.org/10.4038/tar.v23i2.4642">http://dx.doi.org/10.4038/tar.v23i2.4642</a></span><p> </p>
topic meristics
morphometrics
oreochromis niloticus
url https://tar.sljol.info/articles/4642
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