The red color pattern in some strains of tilapia has added commercial value in some markets. Although red tilapia may be more marketable, questions have arisen regarding its value as a culture fish. El Gamal (1987) reported that during growout from 130 to 262 g, a red strain of tilapia had significantly lower survival than Oreochromis aureus x Oreochromis aureus and Oreochromis niloticus x Oreo...

objective: the toxic effects of sublethal concentrations of endosulfan on oreochromis niloticus was examined using bioaccumulation and histopathology studies of the liver as toxicological endpoint.  methods: the organization for economic cooperation and development #407 recommended static renewal bioassay was employed during the test .the test fish were exposed to sub-lethal concentrations sepa...

Lethal effects of zinc sulphate (ZnSO4.H2O), a widespread environmental pollutant was evaluated following exposure at different concentrations of the toxicant to Tilapia species, Oreochromis niloticus based on toxicity index of 96 hrs LC50 values. The obtained results were analyzed by the Finney’s Probit Analysis LC50 Method and 96 hrs LC50 value for Oreochromis niloticus was found to be 72.431...

Abstract Keeping health and nutritional value of the packed foods has a great value in food industries. Among the diverse methods of food processing and packaging, vacuum packaging is one of the best methods for a variety of food products, such as fish. In order to evaluate the effectiveness of such method in preventing of bacterial growth during preservation of fish fillets, four vacuum p...

Epithelium Ultrastructure of Nile Tilapia, Oreochromis niloticus Sandra Mariza Monteiro1,*, Elsa Oliveira2, António Fontaínhas-Fernandes1, and Mário Sousa2,3 1Department of Biology and Environment and Center for Research and Technology for Agro-Environmental and Biological Sciences, University of Trás-os-Montes and Alto Douro, Apartado 1013, Vila Real 5001-801, Portugal 2Lab Cell Biology, Insti...

In this paper we report the first comparative study of cold-adapted imidase (EC 3.5.2.2) from the fish (Oreochromis niloticus) liver and its thermophilic counterparts taken from pig liver and Escherichia coli (overexpressed recombinant hydantoinase from Agrobacterium radiobacter NRRL B1). Approximately 6000-fold purification and a 40% yield of fish imidase activity were obtained through ammoniu...

This study was conducted to produce a high percentage of genetically male tilapia through interspecific hybridization between Nile tilapia, Oreochromis niloticus and Blue tilapia, O. aureus and evaluate sex ratio, productive performance and heterosis of the progeny produced. The results revealed that sex ratios of the progenies of (♀ O. aureus x ♂ O. niloticus) and (♀ O. niloticus x ♂ O. aureus...

This study developed niche models for the native ranges of Oreochromis andersonii, O. mortimeri, and O. mossambicus, and assessed how much of their range is climatically suitable for the establishment of O. niloticus, and then reviewed the conservation implications for indigenous congenerics as a result of overlap with O. niloticus based on documented congeneric interactions. The predicted pote...

Streptococcus agalactiae, the Lancefield group B streptococcus (GBS) long recognized as a mammalian pathogen, is an emerging concern with regard to fish. We show that a GBS serotype Ia multilocus sequence type ST-7 isolate from a clinical case of human neonatal meningitis caused disease and death in Nile tilapia (Oreochromis niloticus).