[I decided to target rohu as I can do float fishing and the bait will be safe from crabs][/quote]
Your thinking is correct and surely you will be able to catch your targeted rohus. As the water body is vast you have to bring carps to your swim using ground baits. For your case rotten mustered oil cake tightened with rice bran/husk, boiled rice and soil can work fine. As hook bait wasp learve or red earth worm can be very successful. if you don't able to get them then try bread paste mixed with ghee and honey (ant eggs are highly recommended with bread paste baits as I am a bong angler
). As you are targeting rohu use tiny hooks. All the best for your mission and have screaming takes.