Well, I dont know the answer to your first question, but to beat the "bass" its pretty easy. What i did is when he was on the back of the fish going around the stage is i rolled in front of the fish, blocked his spears and hit him a few times as he passed. Id suggest a weapon with huge damage and good range for this, as a smaller weapon wont hit him and you will only be ble to hit 2-3 times). All other attacks just roll out of the way or dodge. When hes on the ground, get out a bird time ID with fire shot attack (or somthing like that...he spits fireballs). Use that attack, which causes the fisherman to get knocked down and lets you combo him to death. I suggest a fast weapon for this, as his spear is slow, and youll be able to attack and dodge/block then attack again.