I have heard that zebra fish is used for toxicology studies . Is there any other organism that is actively used for toxicological studies?https://www.google.co.in/search?q=zebrafish+toxicity+studies&oq=zebra+fish+tox&aqs=chrome.2.69i57j0l5.11109j0j7&sourceid=chrome&ie=UTF-8
Well, sometimes daphnia (Daphnia Magna also known as water fleas) are used in toxicology bioassays a an indicator genus. I have personally experimented with Daphnia before, and it is easy to see their internal organs through their transparent body. For example, this study uses Daphnia to test the effect of nanoparticles on Daphnia and this article shows the effects of heavy metals on Daphnia. For more information, visit Wikipedia.