Brightness in the water of a fish pond
Brightness in the water of a fish pond is part of the light that is passed into the water and expressed by percent (%).
Sunlight that penetrates the bottom of the pond is affected by turbidity of water. whereas water turbidity is affected by:
- presence of microorganisms (plankton: phithoplankton and zooplankton)
- fine objects suspended (mud)
- water color
the level of water brightness can determine and know the extent of the possibility of the process of assimilation in water.
water that is not too cloudy and not too clear for fish life. good turbidity is turbidity caused by microorganisms in water (plankton). Plankton containing chlorophyll and photosynthesis are called phytoplankton, while plankton that eat phytoplankton because they are unable to carry out photosynthesis are called zooplankton.
the turbidity of the water which is too turbid caused by mud or especially caused by iron hydroxide is very dangerous to fish. because the particles will stick to the gills of the fish that will interfere with the respiratory system of the fish, as a result if the gills are disturbed, the fish will be susceptible to diseases caused by protozoa and bacteria.
For a good brightness value for fish cultivation that is equal to 45 cm (we can see into the water as far as 45 cm)
The tool for measuring the brightness of water is secchi chips (secchi disk). namely rounded pieces with a diameter of 20 cm made of zinc and painted in black and white.
there is also a simple measurement that is by using the palm of the hand dipped in water. the calculation is that if the palm of the dipped hand does not appear as deep as the middle of the arm, it means that the water is too cloudy, then the condition is not good for the life of the cultivated fish.