What do these marine animals mean?

what do a starfish, a water wave, a dolphin, a octopus, a fish, a whale, a shark, a seahorse, a sea turtle, a stingray, a squid, a sea urchin, a jellyfish, a lobster, a crab, a coral reef, a electric eel, a manatee, a baracuda, a shell, and a mermaid symbolize? im just wondering cause im interested in ocean life :)