The diet of Cichla kelberi introduced in an artificial lake in Leme-SP was predominantly composed of common fish species (Oreochromis niloticus and C. kelberi). In the spring and summer, the most consumed item was O. niloticus. However, cannibalism was very common for this species. The high frequencies of O. niloticus and C. kelberi reveal that this species is adapted to a seasonal cycle, feedi...

Fingerlings of Oreochromis niloticus collected in an artificial urban lake from Belo Horizonte, Minas Gerais, Brazil, were evaluated for natural infection with trematodes. Morphological taxonomic identification of four fluke species was performed in O. niloticus examined, and the total prevalence of metacercariae was 60.7% (37/61). Centrocestus formosanus, a heterophyid found in the gills, was ...

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, ...