Here are 15 fish-themed puns perfect for a fishy birthday celebration:

1. “Wishing you oceans of fun on your birthday!”
2. “Hope your birthday goes swimmingly well!”
3. “You’re not just older, you’re fin-er and wiser!”
4. “You’re o-fish-ally another year awesome!”
5. “Keep calm and carpe diem – seize the fish on your birthday!”
6. “May your birthday be as fantastic as a fish’s tail!”
7. “You’re reely amazing – happy birthday!”
8. “Have a whale of a time on your special day!”