In the present study, kidney tissues were selected to measure the catalase (CAT) enzyme activity due to their responsibility in the elimination of the compounds generating reactive oxygen species (ROS). Variation in Oreochromis niloticus kidney CAT activity (114.33±0.33 to 159.5±0.03) was observed throughout the study period. During first week of experimental trial, higher CAT activity (159.5±0...

The electric stunner (e-stunner) is commonly used to handle Nile crocodiles (Crocodylus niloticus) on commercial farms in South Africa, but while it seems to improve handling and safety for the keepers, no information regarding physiological reactions to e-stunning is currently available. The aim of this study was therefore to compare various physiological parameters in farmed C niloticus captu...

Users of the POND decision support system may often be interested in tailoring the models to one or more fish species at a given location. Manual calibration of the fish bioenergetics model in POND for Nile tilapia (Oreochromis niloticus) growth has previously been reported (Bolte et al., 1995). However, estimating suitable parameters for complex, non-linear simulation models by manual calibrat...

The present study aimed to assess the appropriate level of replacement of fish meal (FM) with alternative plant sources in the feed fed to Oreochromis niloticus to evaluate the growth performance. Three isoproteinious (40% crude protein) diets were prepared from different ingredients viz., fish meal, corn gluten meal, wheat gluten meal, and bagasse kenna meal. O. niloticus showed a maximum incr...

Francisella noatunensis subsp orientalis (FNO) is an emerging pathogen of warm water tilapia in a number of different countries. The disease caused by this bacterium in fish is characterized by a systemic granulomatous infection that causes high mortality rates during outbreaks. FNO has been previously described in Asia, Europe, and Central and North America. Its occurrence in South America has...

Growth of Red, GIFT and Supreme Nile tilapia strains were evaluated. Fish were cultivated in indoor recirculation systems in 0.5 m3 tanks with controlled temperatures of 22, 28 and 30°C. Random samples of 20 fish from each strain (10 fish tank) were weighed at day 7, 30, 60, 90 and 120. Exponential model (y=Ae) and Gompertz model (y = Aexp(-Be)) were fitted and the estimates parameters were obt...

Almeida, J. A., Y. S. Diniz, et al. (2002). "The use of the oxidative stress responses as biomarkers in Nile tilapia (Oreochromis niloticus) exposed to in vivo cadmium contamination." Environment International 27(8): 673-679. Water contaminants have a high potential risk for the health of populations. Protection from toxic effects of environmental water pollutants primarily involves considering...

The present study was suggested in order to explore the capability of water treatment plants to induce changes in organisms using the fish as a model. To achieve such a purpose, Oreochromis niloticus were chosen as a test material for the study. Two hundred apparently healthy Oreochromis niloticus were divided into 7 groups (control and 3 different WTPs) to assess differences developed from wat...