Mystus gulio, locally known as ‘Nuna Tengra’ a native estuarine catfish of Bangladesh.
One cause might be -
As the catfishes are scaleless, in small cages either made by net or other materials, when the fish bodies come in to the touch of cage, small lesions develop, Then first bacterial and in more severe cases fungus infection follow. The net of the small cages are also not very friendly for pectoral and dorsal spines and barbels of these fishes. You should carefully check the DO, pH and dissolved pollutants in the water. I hope, this might help. All the best. Prof. Mostafa Hossain
As they are spiny, there might be some physical injury caused by the spines if you keep them in a net cage at crowded condition which eventually increases the mortality.
Feed quality and water quality can cause mortality. Better check if water exchange has been blocked by algae grown on the net.
The fishes when try to move, the spines may get entangled in the net and will lead to injury and death. Water quality also need to be checked
First of all you should check the water quality. If its alright then you can go for rest of the observation, whether cage material is causing any kind of injury to them or not.
I think there are many resons for catfish mortality reared in cages such as poor water quality , unbalanced feed and bacterial infection
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