In the experiment, which used tilapia selection can be found in the source water in General. If there is contamination of substances like estrogen can use tilapia as biological indicators.
In experiments so choose tilapia. Which can be found both to the water source. If there is contamination of the liquid estrogen can be used as indicators of biological fish is.
In the experiment, choose the tilapia. Which can be found under water anvil. If it is contaminated with similar to estrogen can be used as biological indicators of tilapia.