Been going for Crushfish and seeing how many times I've seen "got it after a couple casts in South Shore" I thought I'd update you on my stats thus far in South Shore:
Rainbow Fin Albacore: 64.6% (1473)
Oily Blackmouth: 23.8% (542)
Firefin Snapper: 10.0% (227)
Small Locked Chest: .7% (15)
Message in a Bottle: .5% (12-2 Day 4 Diary Pages)
Waterlogged Crate: .5% (11)
2280 casts, and still no luck BUT I WILL NOT QUIT!