Urchin
· Quillfish
Well, you is not a letter. "U" is though. and the sea Urchin starts with 'U'.
Sea creatures starting with B include bass, blowfish, barracuda, barbot, butterfish, bluefish, black manta, basa...
There are no ocean names starting with "R" - there is a sea, the 'Red Sea'.
Seals, sea lions, seahorses.
Dolphin
Baltic Sea
Jellyfish
dolphin
· Unicorn Fish
· South China Sea · Sea of Japan
erne is a sea eagle