Fish is suspected to be diseased when there is a change in the normal behaviour and the physical nature of the fish. A well observant farmer would notice the following:
• Behavioral Signs of Disease in Fish
(i) Swim sluggishly in an uncoordinated zigzag manner
(ii) Gasp at the surface of the water for air
(iii) Fish rub its body against surfaces in the pond
(iv) Loss of appetite, so fish refuse to eat
(v) Look for shade in order to avoidance light within pond
(vi) Float with underside (ventral) up
(vii) Fail to respond to fright stimulus
(viii) Crowd at water inflow
• Physical Signs of Disease in Fish
(i) Ragged or torn fins
(ii) Lesions or sore in the body
(iii) Loss of scales and body discolouration
(iv) Gills turns pale colour
(v) Loss of weight
(vi) Wearing away of the skin and the gill
(vii) Accumulation of liquid in body cavity.
(viii) Gapping mouth
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