This study was conducted using butyric acid as a growth enhancer in the diets of Clarias gariepinus and Oreochromis niloticus. C. gariepinus (42.39 g ±1.17) were fed diets containing varying inclusion levels of butyric acid (BA); 0 (CG1), 0.5 (CG2), 1.0 (CG3), 1.5 (CG4), 2.0 (CG5) g kg -1, where, CG1 is the control or reference diet. O. niloticus (25.50 g ± 0.50) were also fed diets containing ...

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Giving animals their preferred items (e.g., environmental enrichment) has been suggested as a method to improve animal welfare, thus raising the question of how to determine what animals want. Most studies have employed choice tests for detecting animal preferences. However, whether choice tests represent animal preferences remains a matter of controversy. Here, we present a history-based metho...

Successful crossbreeding between Oreochromis niloticus and Sarotherodon melanotheron to produce a commercial hybrid has been difficult. The karyotypes and isoenzyme of these two species and their reciprocal hybrids (O. niloticus female × S. melanotheron male, S. melanotheron female × O. niloticus male, the last not included in the isoenzyme study) were investigated via metaphase chromosomes obt...

175 Referred by Prof. Dr. Ismael A. Eissa Professor of Fish Diseases, Fac. Vet. Med., Sues Canal University Pathological studies on effects of aflatoxin on Oreochromis niloticus with application of different trials of control By Amany, M. Kenawy*; Hala, M. El-Genaidy**; Mohammad, M. N. Authman* and Abdel-Wahab, M. A. *** * Hydrobiology Dept., National Research Center, Giza ** Pathology Dept., I...

Received 15/4/2009 Accepted 23/1/2010 (004164) 1 Veterinary Toxicology and Toxic Plants Laboratory, Preventive Veterinary Medicine Department, Agrarian Sciences Center, State University of Londrina, Rod. Celso Garcia Cid, s/n, Km 445, Bairro Perobal, CP 6001, CEP 86051-990, Londrina, PR, Brazil, E-mail: [email protected] *Corresponding autor Determination of presence and quantification of cadmium, ...

Sex ratio, size at maturity, maturity stages, fecundity and egg diameter of Oreochromis niloticus from Coatetelco Lake, Morelos State, Mexico, were studied from January to December 1993. Sex ratio (male:female) was approximately 1:1.02. Length at maturity was 117 mm (males) and 120 mm (females). The fecundity ranged between 104 and 709 eggs, with egg diameter from 1,000 to 3,000 microns. The go...

Key to predicting the response of fishes to climate change is quantifying how close fish are to their critical thermal limits in nature and their ability to adjust their thermal sensitivity to maintain performance. Here, we evaluated the effects of body size and habitat on aerobic scope (AS) and thermal tolerance of Nile perch Lates niloticus (L.), a fish of great economic and food security imp...

Unaffordability of commercial feeds to semi-intensive Nile tilapia, Oreochromis niloticus farmers has led to reliance on supplemental feeding and fertilization for nutrition of their fish without a scientific basis. This study compared the growth, survival, condition factor and yield performance of O. niloticus fed on mixed ingredients (MI) and rice bran alone (RB) diets reared in fertilized ea...