The Application of Grass Carp (Ctenopharyngodon idella) as Biological Control Agent for the Over-Abundant Growth of Aquatic Weeds in Irrigation Canal Systems of Sugar Company, Richard Toll in North Senegal

Poster (2008, July)

Early sex reversal during the embryonic development in the Nile tilapia

in Cybium (2008), 32(2), 104-105

Early Sex reversal during the embryonic development in the Nile tilapia, Oreochromis niloticus.

Poster (2007)

Growth improvement of Eurasian perch (Perca fluviatilis) using domesticated strains under intensive rearing conditions

in Aquaculture (2007), 272

Sex determination in Nile tilapia, oreochromis niloticus: effect of high temperature during embryogenesis on sex ratio and sex differentiation pathway

in Aquaculture (2006)

Ontogenetic variations of thermal optimum for growth, and its implication on thermolabile sex determination in blue tilapia

in Journal of Fish Biology (2002), 61(3), 645-660

Knowledge of how the optimum temperature for growth (Tdegrees(opt)) varies during ontogeny, and how close it is to the temperatures that induce Phenotypic masculinization is fundamental to the ... [more ▼]

Knowledge of how the optimum temperature for growth (Tdegrees(opt)) varies during ontogeny, and how close it is to the temperatures that induce Phenotypic masculinization is fundamental to the understanding of the evolution of thermolabile sex determinism (TSD) in fishes. In blue tilapia Oreochromis aureus, Tdegrees(opt) is 32.6degrees C at the start of exogenous feeding (10 mg fish) and it decreases by c 1degrees C each time that the fish bode mass increases by an order of magnitude. Temperatures <35degrees C are not sufficient to induce complete phenotypic masculinization. Based on a multiple-regression model (r(2)=0.938) plotting growth against body mass and water temperature. genotypically female tilapia living at high temperatures during the thermosensitive period (21-28 days) and being reversed into phenotypic males should incur an initial growth disadvantage over fish living at Tdegrees(opt) but not over those living at slightly colder temperatures (27-29degrees C). This initial disadvantage would be later compensated for by faster growth because of between-sex growth dimorphism to the detriment of phenotypic females. These arguments suggest that there is no definite pressure against the selection of TSD in blue tilapia and probable other Oreochromis spp. (C) 2002 The Fisheries Society of the British Isles. Published by Elsevier Science Ltd. All rights reserved. [less ▲]