True, a lot of cultivated fields use fertilizers that can be harmful to fish
I think in real life because you get to see how they act and i have been on three trips i know that this is not related but I've been to Egypt and Italy and china and i am in 7th grade so ya. I think seeing animals and things in real life is the best thing to do overall.
1. observing
2. forming hypotheses
3. testing hypotheses
4. analyzing data
5. evaluating results
Hope it helped