to get rhinochimera the zone is
Arrapago Reef i fish them around I-10 close to the boat.
set up: Lu shang's fishing rod (thats all i use and it did not snap on me yet. dont know about other rods) useing a sinking minnow. they fight hard and have tones of hp not all that hard to land though. anyways good luck.
o also other fish i get are(if it matters):
1)Mercanbaligi
2)Istakoz