- backwaters
- bacterium
- baleen
- banks
- barnacle
- basad
- bathypelagic
- behaviour
- benthic
- benthopelagic
- biarmed
- bicolored
- bicuspid
- bifid
- bilateral
- bilobate
- biologist
- biology
- biomass
- biota
- biotope
- bivalve
- BL
- bladder
- blastopore
- blastula
- blood
- blow
- blowhole
- blubber
- bone
- border
- boreal
- boss
- botanist
- bowride
- brachiopods
- brackish
- breach
- breeding
- buffer
- bull