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Raven--yes. The put giant cylinders near a source of sunlight, and once the algae has grown onto the sides, they start a diatom culture. The diatoms feed on the algae. Once they have enough diatoms--which are a super abundent plankton--they feed the diatoms to whatever they are trying to grow: baby fluke, baby cod, oysters, clams, etc.
We don't have to feed our oysters, luckly. They eat what nature gives them.
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