To catch a big fish I think you have to have a golden (or higher) fishing rod. The iron will catch you small fish...the silver will get you medium...so gold should get you big fish.
Chat with our AI personalities
You need to befriend Makumaku (the big white furry animal you find near the Harvest Sprites' house in the winter). His favorite food is fish.
use the yellow fish for bait
you have to catch a regular fish and then give it to the red fish and get it
You can catch a coelacanth in the ocean when it is snowing or raining, and is a very big fish.
What you do is when you unlock the third windmill you mix fertilizer and fodder and you will get grass seeds. They will make a big profit at the bazaar!