Based on the popular books by Marcus Pfister, the animated series follows the adventures of a boy fish with glittering scales and his friends in the underwater Bay of Neptune.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Rainbow Fish and the New Girl at School | 2000-01-08 | 12 min |
| Season 1 | Episode 2 | Rainbow Fish Meets Wayne Grunion | 2000-01-15 | 12 min |
| Season 1 | Episode 3 | Rainbow Fish Plays the Conch Shell | 2000-01-22 | 12 min |
| Season 1 | Episode 4 | Riptide | 2000-01-29 | 12 min |
| Season 1 | Episode 5 | Rainbow Gets an 'A"' | 2000-02-04 | 12 min |
| Season 1 | Episode 6 | Grandpa's Fishy Tale | 2000-02-11 | 12 min |
| Season 1 | Episode 7 | Rainbow's Dental Dilemma | 2000-02-18 | 12 min |
| Season 1 | Episode 8 | Rainbow Fish and the Pop Star | 2000-02-25 | 12 min |
| Season 1 | Episode 9 | Sherman Shrimp | 2000-03-03 | 12 min |
| Season 1 | Episode 10 | Lost in Crumbling Canyon | 2000-03-10 | 12 min |
| Season 1 | Episode 11 | The Golf Lesson | 2000-03-17 | 12 min |
| Season 1 | Episode 12 | Ruby's Adventures in Babysitting | 2000-03-24 | 12 min |
| Season 1 | Episode 13 | Sir Sword Goes Back to School | 2000-03-31 | 12 min |
| Season 1 | Episode 14 | Rainbow de Bergerac | 2000-04-07 | 12 min |
| Season 1 | Episode 15 | Big Fish on Campus | 2000-04-14 | 12 min |
| Season 1 | Episode 16 | Sibling Rivalry | 2000-04-21 | 12 min |
| Season 1 | Episode 17 | One Fish's Treasure | 2000-04-28 | 12 min |
| Season 1 | Episode 18 | Project Rainbow Fish | 2000-05-05 | 12 min |
| Season 1 | Episode 19 | Ruby Slips In | 2000-05-12 | 12 min |
| Season 1 | Episode 20 | Working Fish | 2000-05-19 | 12 min |
| Season 1 | Episode 21 | Cecil B. Derainbow | 2000-05-26 | 12 min |
| Season 1 | Episode 22 | Rainbow's Pen Pal | 2000-06-02 | 12 min |
| Season 1 | Episode 23 | Campus Current | 2000-06-09 | 12 min |
| Season 1 | Episode 24 | Fish Alone | 2000-06-16 | 12 min |
| Season 1 | Episode 25 | Rainbow Fish and the In Crowd | 2000-06-23 | 12 min |
| Season 1 | Episode 26 | Knights of the Coral Table | 2000-06-30 | 12 min |
| Season 1 | Episode 27 | Bad Luck, Ruby | 2000-07-07 | 12 min |
| Season 1 | Episode 28 | Father's Day | 2000-07-14 | 12 min |
| Season 1 | Episode 29 | Prehistoric Pal | 2000-07-21 | 12 min |
| Season 1 | Episode 30 | May the Better Fish Win | 2000-07-28 | 12 min |
| Season 1 | Episode 31 | Blue's Fishy Catch | 2000-08-04 | 12 min |
| Season 1 | Episode 32 | To Catch a Thief | 2000-08-11 | 12 min |
| Season 1 | Episode 33 | Guess Who's Coming to Dinner | 2000-08-18 | 12 min |
| Season 1 | Episode 34 | It's a Wonderful Fish | 2000-08-25 | 12 min |
| Season 1 | Episode 35 | Moving Day | 2000-09-01 | 12 min |
| Season 1 | Episode 36 | A Romantic Dinner | 2000-09-08 | 12 min |
| Season 1 | Episode 37 | The Bodyguard | 2000-09-15 | 12 min |
| Season 1 | Episode 38 | Mum's Away | 2000-09-22 | 12 min |
| Season 1 | Episode 39 | How Sea Filly Got Her Groove Back | 2000-09-29 | 12 min |
| Season 1 | Episode 40 | High Tide Noon | 2000-10-06 | 12 min |
| Season 1 | Episode 41 | Game Girl | 2000-10-13 | 12 min |
| Season 1 | Episode 42 | There's No Business Like... | 2000-10-20 | 12 min |
| Season 1 | Episode 43 | Sea Filly Needs a Helping Fin | 2000-10-27 | 12 min |
| Season 1 | Episode 44 | Prince Blue | 2000-11-03 | 12 min |
| Season 1 | Episode 45 | Pool Shark | 2000-11-10 | 12 min |
| Season 1 | Episode 46 | Halloween Under H2O | 2000-11-17 | 12 min |
| Season 1 | Episode 47 | An Eviction Notice | 2000-11-24 | 12 min |
| Season 1 | Episode 48 | The Vacation | 2000-12-01 | 12 min |
| Season 1 | Episode 49 | Cave Mates | 2000-12-08 | 12 min |
| Season 1 | Episode 50 | Chomper, Master Thespian | 2000-12-15 | 12 min |
| Season 1 | Episode 51 | Rainbow's Hiccups | 2000-12-22 | 12 min |
| Season 1 | Episode 52 | Santa Sword Is Coming to Town | 2000-12-25 | 12 min |
| Directing | Drew Edwards | Director |