Variations in mortality have been found ranging from around 15% in farms with a mixed stocking to approximately 82% in farms with mono-sex Nile tilapia monoculture in earthen ponds. The parasite has a cosmopolitan distribution and it is found in both freshwater and marine fish (Hassan et al., 2007; Smit et al., 2000). regions, but this crustacean was not found in the Nile tilapia in the State of Amapá. This study investigated the use of silymarin, an extract obtained from the milk thistle (Silybum marianum) and its effects as a possible hepatoprotector in Nile tilapia (Oreochromis niloticus). Observed parameters were indications of high nitrogen loading in the cage site. 3 shows that zooplankton sharing to gut content was generally inconsiderable, and the high zoo content was obtained at small fish sizes, and completely disappeared in large sizes. Affected fingerlings were commonly detected within 10-15 days post transfer to grow-out ponds, with mortality ranging from a low level of 15-20% to a high level of 82% ( Table 1 ). 0-g fish(16,17). In the Nile tilapia, the sex determining amhY gene found in strains relying on the LG23 system is expressed ˘9 days post fertilization (dpf) in differentiating XY testes (Li et al., 2015). Tilapia can sometimes be found in brackish water, but your best bet is to look for this fish in freshwater bodies. The total saturated fatty acids of fried Nile tilapia in the current study were found to be 51.8% of the total fatty acids which were higher compared with other study done in Nigeria (42.4%) (Oluwaniyi et al., 2017). IgD is considered to be a recently-evolved Ig and a puzzling molecule, being previously found in all vertebrate taxa, except for birds. The parasitic infections in Nile tilapia farmed in Brazil are caused by protozoan, monogenoidea, crustacea and digenea species, and the regional differences on their prevalence and intensity rates are discussed in this study. in the diet. Tilapia mainly live in shallow freshwater streams, ponds, rivers, lakes, or other water bodies. Silymarin was used as feed additive to the diet at a concentration of 0.1% (1 kg per ton of dry ration) with the commercial product named Di-Heptarine S® (16% silymarin phosphatide). Commercially important as a food fish and is also farmed. Positive aquacultural characteristics of tilapia are their tolerance to poor water quality and the fact that they eat a wide range of natural food organisms. Description: Tilapia are a hardy, fast growing fish, that can live up to ten years and reach ten pounds in weight. Freshwater tilapia culture . Nile Tilapia can be raised in various ways, including ponds and in pristine lakes – about 70% of the Fresh Tilapia eaten in the USA is all natural and lake-grown. Rearing Nile tilapia and giant freshwater prawn in polyculture can be very efficient, as these animals occupy distinct ecological niches and consume natural feedstuffs. Predation is high from birds, fish and humans because they are so visible in the water. Red strains of Nile tilapia are an important step, as red Nile tilapia are only found in domesticated populations and they have very little chance of surviving in the wild. the other hand, are found in river basins and lakes of Israel and northern to central africa (Trewavas 1983). Tilapia Nila is a species of tilapia, a cichlid fish found in Africa from Egypt to East and Central Africa and as far West as the. Tilapia (/ t ɪ ˈ l ɑː p i ə / tih-LAH-pee-ə) is the common name for nearly a hundred species of cichlid fish from the coelotilapine, coptodonine, heterotilapine, oreochromine, pelmatolapiine and tilapiine tribes (formerly all were "Tilapiini"), with the economically most important species placed in Coptodonini and Oreochromini. Males of Nile tilapia were distributed among eight net cages (6 m3), and fed for 105 days with two diets: control (CON), without Schizochytrium sp., and supplemented (SUP), with 1.2% Schizochytrium sp. In both studies, the type of oil used was palm oil. However, among several challenges, the presence of pathogenic bacteria causes high economic losses. Nile tilapia, Oreochromis niloticus L. and its hybrids, is the most important cultured fish . 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