Changes in the behavior of A. testudineus included loss of equilibrium where fishes were not able to
balance while swimming, aggressive jumps, decline in the general activity and the irregular swimming
patterns. These are most probably due to neurotoxin effect inflected by the leachate exposure. In addition
to that, the exposed fishes were also excreting excessive mucosal secretion while having difficulties in
breathing. This probably due to the lack of oxygen thus encouraged the fishes to gather at the surface.
Similar observation was reported among red tilapia by Daud et al. [9, 10].
Discolouration of exposed fishes was observed in the study, and it could be due to the loss of
colouring pigment caused by ammonia poisoning. Other observation of behavioural changes included
swimming disorder, loss of equilibrium, unusual leaping action, and declination in the general activities.