How do merfolk develop agriculture

Let's say that a race of aquatic merfolk have managed to achieve sapience, they are basic hunter gatherers, living in relatively shallow waters of up to 100 meters deep. As I have begun designing their culture I have ran into a road block, how does such a species develop agriculture? After all, very few plants exist so deep and those that do grow do not produce fruit or vegetables. I had originally planned on them domesticating schools of tuna or salmon or even prawns or krill, but the amount of such an animal they would need to keep in order to provide for even just a town would be way too massive.

How does a culture living underwater develop agriculture? If they cannot develop agriculture, what else can exist for them in lue of it? Let's assume that these merfolk are omnivorous mammals.

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How do merfolk develop agriculture

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