What is Nila

Nila in English well-known as "Nile Tilapia". It some thing  like fish that live in fresh water. Nila usually live in river and pond. The farmer use nila for aquacultur in fishpond to improve their income. In indonesia especially in Aceh the Farmer can get fry of Nila in BBI Batee Iiek ( some thing like institusion that owned by Aceh Province) and in Pidie we can get fry of Nila in BBI Keumala ( some thing like institusion that owned by Pidie regency).

Nila
Scientific Cassification
Kingdom	:  Animalia
Phylum	:  Chordata
Subphylum	:  Vertebrata
Class	:  Actinopterygii
Order	:  Perciformes
Family	:  Cichlidae
Genus	:  Oreochromis
Species	:  niloticus

Nila fish is Animal  that group in omnivore that feeds on both plankton and aquatic plants. Nila fish generally feeds in shallow waters, as harmful gases (such as carbon dioxide, hydrogen sulfide, and ammonia) and temperature fluctuations found in deep waters create problems for the physiology of the fish. Nila fish thrives on the warmer temperatures commonly found in shallow waters compared to the colder environment of the deep lake. Nila fish generally are macrophyte-feeders, feeding on a diverse range of filamentous algae and plankton.

Nila fish usually feeds during daytime hours, it means exhibits a behavioral response to light as a main factor contributing to feeding activity. Due to their fast reproductive rate, however, overpopulation often results within groups of Nila fish. Night feeding may also occur due to competition for food during the daylight hours, It means to obtain the necessary nutrients. 

Parrot Fish Gender Change

Parrot Fish Gender Change. the change of gender of parrotfish has pollution of the river in Surabaya and its surroundings is already so severe. In fact, found along Brantas River, including Surabaya River, is very surprising, ranging from the reduction of fish species, cleft lip to change sex because contaminated birth control pills (family planning). change of sex of parrot after done census, fish female population dominate result of this census. That is, more and more people are dumping dirt into Kali Surabaya, the population of female fish species is getting bigger. "Because human feces carry reproductive hormones, can make fish change sex. That is, the fish that should be male even grow into a female, "said Andreas (Surya.co.id, 2010).

Parrot Fish Gender Change

change of sex of parrot fish according to various research, this change one of them caused by birth control pill of woman. He explains, urine acceptor of birth control pills containing synthetic esterogen hormone which is the main component of the pill. When urine is dumped in Kali Surabaya, the water is polluted by the synthetic esterogen hormone. Pollution is what allegedly by Andreas has caused male fish to be female (Surya.co.id, 2010).

the sex-change of the parrot has the sex of an organism determined by several factors such as environmental factors and genetic conditions. Genetically, chromosomes play an important role in determining sex (sex chromosomes or gonosomes). To get the sex of the fish in accordance with the desired can be done several ways yatiu treatment with hormones, chromosome manipulation, and a combination of both and through the process of hybridization, gynogenesis, androgenesis (Arifin, 2005).

the change of the sex of the parrot is a method to change the sex of fish artificially from female to male or vice versa. Sex change is possible because in the growth phase of gonad there has been no genital differentiation and there is no steroid formation so genital formation can be directed by using steroid synthesis hormone. Hormones regulate multiple reproductive phenomena such as gonadal differentiation, gamete formation, ovulation, morphological or physiological changes in the spawning season or pheromone production. Differentiation of gonads occurs first followed by other phenomena (Arifin, 2005).

the sex-change of the parrot has sex steroids that function to change the sex is androgens (testosterone, metltestoteron etc) which gives the effect of masculinity and estrogen (estron, estrodiol etc) which has the influence of femininity (Arifin, 2005).