**7. Conclusion**

Environmental pollution is of current environmental concern. It is therefore necessary to find solutions to determine environmental contamination, because the organisms are contin‐ uously exposed to a variety of anthropogenic toxicants daily released to the environmental.

The silver catfish have been used for bioindicator of environmental contamination for many researches and can be used to aquatic biological systems. Moreover, a considerable expan‐ sion of knowledge in using various model species which are easily cultured and have lesion induction times of relatively short duration, such silver catfish.
