Can be Found off the Barge in Carpenter's Lnading (Phanauet Chanel) on certain rides, not each. Bite rate sucks, even with the rather useless key item "Frog Fishing".
I may try the coast off of Newtpool in Carpenter's Landing (take the Northwest Jugner Forest entrance. I just haven't found a use to fish for these other than the Fish Contest in Selbina.