Genetic variability in four fish species (Pimelodus maculatus, Prochilodus lineatus, Salminus brasiliensis and Steindachneridion scripta) from Uruguay River basin

Abstract

The genetic variability of four fish species (Pimelodus maculatus, Prochilodus lineatus, Salminus brasiliensis and Steindachneridion scripta) collected in the upper Uruguay River basin was analyzed using the

Two genetic stocks of Steindachneridion melanodermatum living in sympatry in nature and genetic variability of wild parents and F1 generation

“…Nonetheless, the range of exiting variation is considerably low in comparison to genetic similarity values obtained for S. scriptum (Ramella et al, 2006).…”

“…Genetic similarity ranged from 0.57 to 0.95. A study carried out by Ramella et al (2006) with S. scriptum specimens from the Uruguai River found genetic similarity ranging from 0.0 to 1.00, indi-cating a greater degree of diversity in the 13 specimens examined when compared to the 27 specimens examined in the present study. This seems to indicate a loss of genetic diversity in S. melanodermatum, although no other study has been carried out for this species as a comparative parameter for the data presented here.…”

“…The RAPD method is used in fish studies aimed at the genetic monitoring of population stocks (Wasko et al, 2004), the identification of species and broodstocks (Partis and Wells, 1996;Prioli et al, 2002;Ali et al, 2004), structuring analysis of natural populations (Wasko and Galetti Jr., 2002;Almeida et al, 2003;Hatanaka and Galetti Jr., 2003;Leuzzi et al, 2004;Matoso et al, 2004;Sofia et al, 2006) and genetic variability in populations or species not yet studied from the genetic standpoint (Ramella et al, 2006). In other groups, RAPD Genetic variability in Steindachneridion melanodermatum markers have been combined with methodologies of a less arbitrary nature in order to generate better defined DNA patterns, i.e., DNA fingerprinting, for the purpose of molecular characterization (Aggarwal et al, 2008;Demir et al, 2010), for analysis of genetic diversity (Brahmane et al, 2008;Rabello et al, 2008) to provide practical information for selection of parentals in planning breeding strategies (Ahmad et al, 2010), and to determine phylogenetic relationships (Marouelli et al, 2010) besides population differentiation (Klinbunga et al, 2010) between wild and cultivated stocks (Sesli and Yegenoglu, 2010).…”

Genetic characterization of fin fish species from the Warri River at Ubeji, Niger Delta, Nigeria

“…The RAPD technique has been used in the evaluation and identification of the genetic diversities of species and subspecies of tilapia (Bardakci and Skibinski, 1994;Dinesh et al, 1996;Ahmed et al, 2004;Ali et al, 2004;Sherif et al, 2009;Soufy et al, 2009);carps (El-Zaeem et al, 2006); Clarias gariepinus (Saad, et al, 2009); Prochilodus marggravii (Hatanaka and Galetti, 2003); Pimelodus maculatus, P. lineatus, Salminus brasiliensis and Steindachneridion scripta, (Ramella et al, 2006). Similarly, Hassanien et al (2004) found genetic diversity among different populations of Oreochromis niloticus in Egypt using this technique.…”

Microsatellite analysis of the parental contribution of Piaractus mesopotamicus to the production of offspring in the semi-natural system of reproduction

“…The most important management practice in stock enhancement programmes is monitoring the genetic diversity of the offspring (Sirol and Britto, 2006). The molecular markers are the most important method to achieve such purposes (Barroso et al, 2005;Liu et al, 2005;Ortega-Villaizán Romo et al, 2006;Ramella et al, 2006;Sønstebø et al, 2007). The objective of the present study was to evaluate the genetic diversity and parental contribution of Piaractus mesopotamicus in the production of offspring in the semi-natural system of reproduction.…”