Answer:
He made sure that he caught fish that were only of a certain length and that he treated animals carefully and almost respectfully with consideration for their ability to procreate.
Step-by-step explanation:
Snapping Turtle is a short story about a young boy who was (thanks to his grandpa and grandma) wiser than his age. One of his hobbies was fishing.
We can see in lines from lines 86 to 90 that, according to his grandpa's instructions,
1. he never kept a trout that was shorter than seven inches. If they were shorter than 7 inches, he put them back into the water;
2. he made sure never to hold a trout with a dry hand to prevent the fish from becoming susceptible to infection.
Then we also see in lines 320 to 334 that he chooses to, upon his grandpa's advice, release the snapping turtle back into the water because it probably was getting ready to law eggs.
Cheers!