Application of multifactorial discriminant analysis in the morphostructural differentiation of wild and cultured populations of Vieja Azul (Andinoacara rivulatus)

Authors : Johanna CAEZ, Ana GONZALEZ, Martín A GONZÁLEZ, Elena ANGÓN, Jorge M RODRIGUEZ, Francisco PEÑA, Cecilio BARBA, Antón GARCIA

Pages : 516-530

View : 19 | Download : 11

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :To better determine the ecological variation insert ignore into journalissuearticles values(body shape and structure); of the Vieja Azul insert ignore into journalissuearticles values(Andinoacara rivulatus; syn.: Aequidens rivulatus); in northwest Ecuador insert ignore into journalissuearticles values(Los Ríos Province);, 300 specimens of both sexes insert ignore into journalissuearticles values(150 male and 150 female); were collected from 3 different locations, one from a wild production system and two from fish farm populations in the Quevedo River. Twelve meristic, 26 traditional morphometric, and 32 truss measurements, among 25 anatomical landmarks, were determined. The body weight insert ignore into journalissuearticles values(BW);, total length insert ignore into journalissuearticles values(TL);, eye diameter insert ignore into journalissuearticles values(ED);, dorsal fin ray length insert ignore into journalissuearticles values(DFRL);, and body perimeter 3 insert ignore into journalissuearticles values(P3); showed significant differences insert ignore into journalissuearticles values(P < 0.05); between production systems, and sex had significant influence on preanal length insert ignore into journalissuearticles values(Pre-AL);, P3, and body width 2 insert ignore into journalissuearticles values(LC2);. Females showed higher mean values than males in all measurements, except for BW. The Fulton factor differed for both factors considered. The canonical discriminant analysis revealed a percentage of correct assignment of 64.42% for the dataset, 85% and 60.9% for cultured and wild females, and 62.1% and 56.3% for wild and cultured males, respectively, as well as morphometric variation between groups. Results could be attributed to environmental conditions insert ignore into journalissuearticles values(habitat, temperature, and food);. The Mahalanobis test showed greater distances among females than among males. In conclusion, this study provides valuable morphological information on the shape and structure of Andinoacara rivulatus that can be used to characterize and quantify the changes that occur as a consequence of adaptation to a different habitat. The authors hope that the information obtained from the present study will be helpful for fisheries, biologists, and taxonomists.
Keywords : Andinoacara rivulatus, condition factor, discriminate analysis, ength weight relationship, morphometric characteristics, population