What is the best level to play to get fishes for the fishing tournament?

Level 3 is great. You get 2 right off the bat and it's a quick level

I play 34 - the last tournament I placed second and the current one I'm in 3rd place... and determined to win! 

I play 782 I can get 20 fish every time 

Candy Crush Soda

I hope this helps people and makes sense.

First off you get 1 fish per 1 fish CREATED on previously completed / finished levels.

Second off you get 10 per 1 fish CREATED on unfinished / uncompleted levels. *Those like myself at end of available levels are out of luck for the 10 fish per 1 fish created.*

Third you only get fish for CREATING fish not fish provided by the level or by making them with chocolate / color bombs. Example - Even if you create fish via chocolate / color bomb you don't get any fish for those fish. You do get fish that are crated via after effect of falling candies or candies the fish eliminated.

Best fishing area is section 1 "Candy Town". All should be easy enough to complete and gain fish. Aside from these levels - Level 7, 13 and 14 some find tricky due to rng set up/lay out.

For best fishing Levels try 2, 8, 500 or any level you find worthy of wasting time/lives on while bored to gain more stars and more fish. Other levels in "Candy Town" to try - Level 1,3,4,5,6,15.

I've had some luck on other levels but not enough to remember besides those I listed above. 

I've Won 1st place more than 6 times when I've had spare time as I'm at end of games available levels I'm having to work 10 times as hard to gain fish.

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Welcome, newcomer; but as you've dug up a 5-year old thread (would be in kindergarten if it were a kid), don't expect any replies from those other folks.

And if you're looking for answers about CC Soda (this is CC Saga), then go there...