>I doubt there are even close to 100 varieties of fish available (in markets) at the coasts, maybe 20 to 40 E.g. I've visited Goa (a coastal state) a few times

>I doubt there are even close to 100 varieties of fish available (in markets) at the coasts, maybe 20 to 40 E.g. I've visited Goa (a coastal state) a few times, and at least at the beach restaurants / shacks, where they lay out the fish and other seafood varieties for inspection by customers, I don't remember seeing more than 20 or so items - kingfish, mackerel, red snapper, pomfret, crabs, a couple of types / sizes of prawns, squid, shark, that's almost it. One place that I went to a few times, had seafood special nights (the owner fished as a hobby), where there were a few more kinds, like barracuda, tuna, mussels, etc. These were in general touristy areas though. Local markets and restaurants may have more varieties.