For clams of the muscles variety, they are freely available, irregardless of the tidal situation – just head for a sandbar or dock and start looking, in the water, of course. Don't forget the pasta.
Stripers? Say, that was a typo. Right? They seem to streak whenever the urge strikes, also irregardless of the tidal situation.
Oops, did you mean stripers, as in bass? Follow one of those low-rider style boats with the big outboard hanging on the stern.
As for crabs, watch the local raccoons. They seem to have crab catching mastered.
One thing is for sure, it always seemed like low tide, odor-wise, at the state park by the Long Island bridge – must be a NY thing?
Don’t you just love cabin fever?!?