This will get more fleshed out as we migrate OMFG to 2.0

Coastal (Default)

Fish you'd expect to see on most warm coastal waters.

River & Lake

Fish you'd see in a lot of lakes and streams.

Sea (mainland sims without coastline)

A lot of fish are accessible with the stock rod, but you'll need a Deep Sea rod to get things like Tuna, Swordfish, etc.

Deep (Abyssal Sea)

===Kraken. Untold Horrors.