Yes, croaker fight like freight trains! We can catch them right off my dad's dock from late April into mid May. They like the shallow warmer water that time of year. I like to catch them on 2 lb test, now that is some fun... My biggest so far was 21.5". Piles of fun!
I don't find bluefish and Spanish mackerel taste anything alike. I like Spanish mackerel better than bluefish though. All I do is gut the fish, leaving the head and tail still on, put some olive oil on aluminum foil, place the fish on the foil, place some lemon slices, some salt, pepper, chives and a bit more oil inside the stomach cavity and around the fish and wrap it up. Into the oven at 325. Mmmmm!