Allozyme and morphological variation throughout the geographic range of the tropical shad, hilsa Tenualosa ilisha

Genetic and morphometric differences between yellowtail snapper (Ocyurus chrysurus, Lutjanidae) populations of the tropical West Atlantic

“…Differences in oceanographic conditions, mainly sea-water temperature, were reported to this area (Castro and Miranda, 1998) being regarded as an important factor in the genetic differentiation of Macrodon ancylodon populations along the Brazilian coast (Santos et al, 2003). Cases where morphometric and genetic data indicate different scenarios of population structuring are not uncommon (Salini et al, 2004;Levi et al, 2004). In the case of Ocyurus chrysurus, the fact that the morphological variation observed formed a gradient is a clear indication that it has likely resulted from phenotypic plasticity.…”

Genetic Variation among Cat Fish (Mystus vittatus) Population Assessed by Randomly Amplified Polymorphic (RAPD) Markers from Assam, India

“…The morphometric data may not be enough to support the established genetic structure of the population that often leads to taxonomic uncertainity in many occasions because of the considerable geographical and ecological variability in form [25,26]. In Hilsa sp., significant differences in allele frequencies and morphological variations were observed from nine different sites within Bangladesh by which may be due to the local environmental conditions [27].…”

Fourteen years after the Shahid-Rajaei dam construction: an evaluation of morphometric and genetic differentiation between isolated up- and downstream populations of Capoeta capoeta gracilis (Pisces: Cyprinidae) in the Tajan River of Iran

“…It has been suggested that the morphological characteristics of fishes are determined by an interaction between genetic and environmental factors (Swain and Foote, 1999;Poulet et al, 2004;Salini et al, 2004;Pinheiro et al, 2005;AnvariFar et al, 2011). The environmental characteristics prevailing during early stages of development, when individuals are more phenotypically influenced by the environment, are of particular importance (Pinheiro et al, 2005).…”

“…Fragmentation of a river ecosystem could alter migration patterns among fish populations (Horváth and Municio, 1998;Jager et al, 2001), producing genetic stocks that are reproductively isolated units and are genetically different from other stocks (Booke, 1999). Stocks are best defined with genotypic or phenotypic markers that are stable and repeatable (Booke, 1999) and identification of discrete populations within stocks is critical for the development of reasonable resource exploitation practices and fishery management (Salini et al, 2004).…”