The present study aimed to test the effects of blue, green or white light on the stress response of the Nile tilapia, Oreochromis niloticus (L.). Each color was tested on two groups of isolated adult Nile tilapia (8 replicates each): one being subjected to confinement stress, and the other not (control). A different environmental color was imposed on each compartment by covering the light sourc...

This study aimed to assess genotoxicity in Nile tilapia (Oreochromis niloticus) erythrocytes after exposure to a sub-lethal concentration of 10 mg L(-1) di-n-butyl phthalate (DBP) for 24 and 96 h. The results showed that mean MN frequencies in both DBP and ethyl methane-sulfonate (EMS, positive control for MN bioassay) groups were significantly different (p<0.01) with respect to control and sol...

The specific objectives of this study were to determine the optimum feeding frequency in juvenile GIFT (Genetically Improved Farmed Tilapia) strain of Nile tilapia (Oreochromis niloticus), for growth rate, body composition, and gastric evacuation, as well as to investigate the passage of a single meal through the stomach in order to establish gastric evacuation rate. Six treatment groups of juv...

Artificial propagation is an important component of chromosome manipulation. Spawning of Nile tilapia (Oreochromis niloticus) was manipulated by photoperiod and temperature control and through hormonal intervention. Four males and ten females produced 86 natural spawns, 41 of which developed to hatching. Artificial propagation resulted in 87 pairings, which were successfully used in 23 tau esti...

A highly pathogenic isolate of Aeromonas hydrophila, isolate No1, was identified through evaluation of the Crude extra-cellular product and estimation of LD50. Three types of formalized whole culture Aeromonas hydrophila vaccine (FWC) were prepared, FWC vaccine alone, FWC vaccine mixed with Freund's complete adjuvant (FCA), and FWC vaccine mixed with Freund's incomplete adjuvant (FIA), tested f...

The availability of O. niloticus fingerlings remains a problem in South Western Highland Agro-Ecological Zones. Most fish farmers produce only small sized fish probably because of inbreeding in Uganda. Brood stocks of Nile tilapia, Oreochromis niloticus L. were collected from Lakes Victoria, Kyoga and Kayumbu, a minor lake in SWHAEZ. The brood-stock were conditioned and bred. Fingerlings of F1 ...

This study provides the first description of long fecal strings in Streptococcus agalactiae-infected fish. Nile tilapia (Oreochromis niloticus) were administered an intraperitoneal injection with 0.1 mL solution containing a 10-fold dilution from 10 1 to 10 6 cfu S. agalactiae/fish. While infected fish developed clinical signs commonly associated with S. agalactiae infection, up to 40% of infec...

This study was conducted to investigate the effects of dietary black cumin (Nigella sativa L.) oil on growth performance, hemato-biochemical, and histopathology cypermethrin-intoxicated Nile tilapia. After determining LC50 (96 h) value cypermethrin, cypermethrin added water at a ratio 1:20 this concentration, fish were fed for 42 days. To reduce 1% feed as potential protectant. Growth parameter...

The present study was conducted to evaluate the serological changes (urea and creatinine) in kidneys of Nile tilapia (Oreochromis niloticus) after acute exposure Malathion. Four groups 15 fish were made each categorized as; Group A: (control group) Groups B, C D (experimental groups). LC50 Malathion 2µg/L at 96 hours tilapia. exposed sub-lethal concentrations 0.5, 1.0 1.5 µg/L group respectivel...