| 21. | Eggs and sperm are liberated into the water column, where fertilisation takes place.
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| 22. | The males shed their sperm and fertilisation takes place in the water column.
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| 23. | Teleosts may spawn in the water column or, more commonly, on the substrate.
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| 24. | They are both rapidly produced and consumed through the water column.
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| 25. | Additionally, natural oceanographic phenomena can cause deoxygenation of parts of the water column.
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| 26. | Gametes are released into the water column where they are fertilised.
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| 27. | However, wave action will often mix the water column and eliminate the thermocline.
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| 28. | Water columns and tanks weer fitted at each end of the station platform.
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| 29. | Phytoplankton also need and rapidly use nutrients in the water column.
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| 30. | It migrates to the upper water column to feed at night.
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