having fished Ratnagiri in 2005 and having caught quite a few Palu, I suggest that you fish the narrow estuary which runs through town below the bridge. Fish it 2 hours in and 2 out for best results.
Tackle can be a 1lb. test rod about 9 feet long. line about 6lb. B/S. tied to a no. 6 long shank hook. I say long shank because a long shank can accomodate a 1 1/2 " prawn round the bend and up the shank.
This shouldbe anchored with a lead only just heavy enough to hold bottom. This weight will vary with the state of the tide. Cast accross and let the weight come to rest . Wait for the take. Fish vary between 1 1/2 - 3lbs. No need to peel the prawns.
Good Luck. By the way, save me a few Ratnagiri Mangoes.