Water quality in catfish farming
Water quality in catfish farming is one of the factors that greatly influence the growth of catfish seeds that are maintained.
Water quality parameters include temperature, brightness, acidity (pH), and dissolved oxygen (DO).
Pond water temperature is generally determined by the temperature of the surrounding air, while the air temperature is influenced by the height of the location from the sea level. The higher the location above sea level, the lower the air temperature and vice versa. Water temperature is one of the physical properties that can affect the appetite of catfish and the growth of catfish bodies. Sudden temperature changes cause fish to die, even though other environmental conditions are optimal. The optimal water temperature for catfish maintenance is 25-33oC.
Water brightness is a measure of water transparency, which is determined visually using Secchi disk. Secchi disk was developed by professor Secci around the 19th century, this tool is used to calculate the level of turbidity of water quantitatively. The level of turbidity of the water is expressed by a value known as Secchi disk brightness. The waters that are safe for catfish farming are waters that can be penetrated by sunlight up to a depth of more than 40 cm.
3. Degree of acidity (pH)
The degree of acidity or pH is a measure of the concentration of hydrogen ions which shows the atmosphere of an acid or base of an aquatic. The degree of acidity of a waters is influenced by the concentration of CO2 and acidic compounds.
The optimum pH value for catfish culture is between 6.5-9.
4. Dissolved oxygen (DO).
The optimal amount of oxygen for catfish is between 5-6 ppm.
To increase the amount of oxygen in the catfish pond water can be done by aeration, mechanical filters and addition of freshener.
Increased oxygen in water by means of aeration means that oxygen or free air is flowed into the water so that it can occupy the cavities left by lighter gas that is expelled.
Increasing oxygen with a mechanical filter means reducing the content of organic matter and colloid in water so that it allows oxygen or free air to enter the cavity in the water.
The addition of freshener means to include ingredients that can bind gases in water so that the cavity left behind can be filled with oxygen or free air.