Catching more fish:
1. get headphones or turn the volume on ur DS up all the way
2. find a fish
3. when you cast ur line out and the fish starts nibbling at the bobber you dont look at the fish. look at ur character or the sky or a tree or close ur eyes, just dont look at the fish.
4. while ur not looking at the fish, listen for the plop sound. when u hear this sound press A or tap ur screen really fast. and u have a fish! tada

question: why do you do this
when the fish is bitting the bait while u are looking at it ur kinda eager to catch the fish and a lot of times you pull ur line back up and u were too early and the fish swims away..='(
when you do this your eyes will not trick u. because u r listening

hope i helped ur fishing skills,
-allie