High productivity in the water in estuaries?

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Estuaries exhibit high productivity due to their nutrient-rich environments, which result from river runoff and the mixing of salt and fresh water. This nutrient abundance supports the growth of microorganisms, which thrive without limitations. These microorganisms serve as a food source for zooplankton, while phytoplankton also flourish in these conditions. The resulting plankton populations provide essential nourishment for larger fauna, including fish, thus establishing a productive food web in estuarine ecosystems.
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is there any reason that there is a great capacity for high productivity in the water in estuaries?
 
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Estuaries are nutrient rich. The nutrient richness is due to river runoff and the mixing of salt and fresh water. The nutrient allows microorganism to grow easily and not in a limited fashion. These microorganism becomes food for the zooplankton. Phytoplankton will also grow well. The plankton then become food for the bigger fauna such as fish.
 

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