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Water is an absolute necessity for all living organisms, especially for humans, animals and plants, along with increasing the number of population, the activity of the use of natural resources, particularly water resources is also increasing, the water resources needs to be improved preservation by balancing the water cycle on earth known as the hydrological cycle. The process of the ...

A. Nitrite (NO2) and nitrate (NO3) Nitrite has the properties toxic to fish. In the blood which contains nitrite reacts with hemoglobin to form methemoglobin as brown blood disease. Nitrite is formed from the reduction of nitrate by anaerobic bacteria in the bottom waters. In the waters of nitrites can be toxic when concentrations greater than 5 mg / l ...

Nitrogen is one of the main elements making up the cell organism that is in the process of formation of protoplasm. Nitrogen often in limited quantities in the waters, especially tropical areas. Shortage of nitrate in the water can inhibit the growth of aquatic plants, although other nutrients are in abundant quantities (Hunter, 1970 in Patadjal, 1993). Nitrogen in the ...

pH is one important factor in the life of marine algae, as well as other factors. According to US-EPA (1973) in Iksan (2005) maximum pH range for the life of marine organisms is 6.5 to 8.5. Chapman (1962) in supit (1989) states that almost the entire algal like a pH range of 6.8 to 9.6 so that the pH is ...

1) Aeromonas hydrophila Aeromonas hydrophila cause disease motile Aeromonas Septicemia (MAS). Another name for this disease is bacterial septicemia hemorrhagi or also known as hemorrhagic septicemia (McDaniel, 1979), infectious dropsy, red disease, pest red (Kabata, 1985) or red spot disease (Eidman et al., 1981). Signs of disease caused is a) fish to be weak, b) Decreased appetite, c) The skin ...

Growth is increase the size of a cell or organism that take place in quantitative or measurable. While the development (differentiation) is a process towards maturity in an organism, a change of state of a number of cells to form organs that have different structures and functions. Growth can also be interpreted as a change in the size of an ...