| Glossary Term starting with Y |
| Search SeaLifeBase |
| Yakiboshi |
| Yale University Peabody Museum of Natural History, Connecticut |
| Yard seine |
| Yawling |
| Year brood |
| Year class |
| Year mark |
| Year-class |
| Yearling |
| Yellow cure |
| Yellow fish |
| Yellow Sea (Hwang Hai) |
| Yield |
| Yield-per-recruit |
| Yield-per-recruit analysis |
| Yokosuka City Museum |
| Yolk |
| Yolk ball |
| Yolk cell |
| Yolk diameter |
| Yolk extension |
| Yolk granule |
| Yolk plug |
| Yolk sac |
| Yolk sac larva |
| Yolk stalk |
| Yolk stripe |
| Yolk-sac |
| Yolk-sac larva |
| Yolk-sac placenta |
| Yolk-sac viviparity |
| York College , Pennsylvania |
| Young |
| Young-of-the-year |