Justify Safety with Biological Indicators

What happens here

Building on the visual evidence, the presenter articulates his reasoning: 'If this water were dangerous for the cows, then fish would not survive in this tire water tank, guys.' He asserts that the health of the goldfish is a reliable 'canary in the mine' indicator, thereby dismissing concerns about the water being 'hazardous for our animals'. He states that this is a 'very common practice in the agriculture world'.

Goal: The presenter uses the survival of the goldfish as a biological indicator to scientifically support his claim that the water is safe for livestock. He explains that if the water were dangerous for larger animals, the fish would not be able to survive.