Pub
Base
Duel
Squad
Shark
Wb
Jav
Spid
Terr
Levi
X
Lanc
Shark
Public:
When to use:

The only time a shark is required in public arenas (pub) is if the other team has a shark. Although holding base is easier with a shark.

Strategies:

Since most players in pub don't cram when defending base mine in the lower part of flag room (fr) entrance. Don't mine too high though, it will result in more team kills (tks). A good strategy is to lay all your mines, use all your reps, try to get a kill by throwing a mine, die and start over. If the other team has a shark it is your job to kill that shark when defending base. This is because your team should be lining leaving you all by yourself.

If you get bored of base you can go into spawn and get some kills by laying mines or you can hunt leviathans (levis).