| 11. | The females release yellow eggs which are fertilized in the water column.
|
| 12. | Epitokous worms leave their burrows and enter the water column in spawning swarms.
|
| 13. | Eggs and sperm are liberated into the water column and fertilisation is external.
|
| 14. | In water columns, some cyanobacteria float by forming gas vesicles, as in archaea.
|
| 15. | Longlines are classified mainly by where they are placed in the water column.
|
| 16. | The remainder will then often sink to the bottom of the water column.
|
| 17. | Every day, they migrate vertically in the water column, following their planktonic prey.
|
| 18. | Water column spawners are more likely than substrate spawners to spawn in groups.
|
| 19. | This fish spends most of its time cruising the water column.
|
| 20. | Sperm and eggs are liberated into the water column where fertilisation takes place.
|
