A breeding program for Nile tilapia in Brazil: Results from nine generations of selection to increase the growth rate in cages.

Variance components and heritabilities for daily weight gain (DWG) were estimated for Nile tilapia farmed in cages across nine generations (G1-G9) of selection in a breeding program in Brazil. DWG was measured in 16,272 accumulated tagged animals representing 535 full- and half-sib families of Nile tilapia under cage farming. The additive genetic variance showed a slight variation (0.

Effect of an homeopathic complex on fatty acids in muscle and performance of the Nile tilapia (Oreochromis niloticus).

Background: The homeopathic complex HomeoAqua Mega 3(®) was designed to stimulate fish liver function resulting in enhanced lipid metabolism and improved overall performance. The effect of the complex in fatty acid compounds in the muscle tissues and the performance of Nile tilapia (O. niloticus) were evaluated.

Effects of a homeopathic complex on the performance and cortisol levels in Nile tilapia (Oreochromis niloticus).

Background: Intensive fish farming results in stress adversely effecting the performance of farmed fish. Plasma cortisol is a validated measure of stress in fish. We evaluated the effect of a homeopathic complex on the cortisol level of Nile tilapias (Oreochromis niloticus).

Morpho-functional response of Nile tilapia (Oreochromis niloticus) to a homeopathic complex.

Background: This study evaluated the performance, prevalence of ectoparasites and morpho-functional response of the liver and the branchiae of Nile tilapia (Oreochromis niloticus) raised on fish meal with added of the homeopathic complex Homeopatila 100(®) at different concentrations.

Methods: Post-reversed juvenile Nile tilapia (O. niloticus) of the GIFT (Genetic Improvement of Farmed Tilapia) strain were used in this study.

Freezing injuries in the embryos of Piaractus mesopotamicus.

Cryopreservation of mammal embryos has been technically feasible for many years, but morphological injuries still persist in fish embryos during cryopreservation. Thus, the objective of the present study was to describe these freezing injuries in Piaractus mesopotamicus embryos. Two hundred and twenty-five embryos were collected at the post-gastrula stage and assigned into four treatments of sucrose at 8.

[Ectoparasites of the Nile tilapia (Oreochromis niloticus) bred in net-tanks in the Corvo and Guairacá rivers, state of Paraná, Brazil].

Current experiment estimates the prevalence of ectoparasites of the Nile s tilapia (Oreochromis niloticus), strain Chitralada, bred in net-tanks during 130 days, from April to August 2006, and reports on the water's physical and chemical parameters. Three hundred and eighty-seven samples of tegumentary scrapes and branchia of post-reversed males were analyzed. Experiment was conducted in thirty 6.