i'm gary caldwell and i'm a marine biologist here at newcastle university.ying to understand how the sea and animals relate and any toxins that take place there. pyridine is a very useful industrial chemical, something we call a solvent, which is very good at dissolving other chemicals. lots of industries use it, it is what we call a legacy pollutant, something that this historical and been used a long time back through industries like that stop. historically, there has been very poor control of effluent discharge, pollution basically being poured into the river. it was treated like an open sewer. we're trying to see how the crabs respond to pyridine, different amounts of pyridine, that's really important to understand, in their environment over three days. so it's trying to understand what the crabs do — do they die, don't they die, do we see signs of stress? hello, gentlemen. welcome to my building. this is where we will be doing the experiment. don't go berserk thinking you can catch it! we have the animals exposed to the chemicals, we gave him plenty of