Which of the following is NOT provided by an aquaponic system?

The correct choice highlights that an aquaponic system does not provide adequate nutrients found in the soil. In aquaponics, plants receive their nutrients primarily from fish waste and decaying organic matter within the system, rather than soil. This unique environment allows for a symbiotic relationship between the fish and plants, where fish produce waste that serves as a nutrient source for the plants, which in turn help to filter and clean the water for the fish.

The other options are integral components of an aquaponic system. Plant support above the nutrient solution is crucial to ensure that plants can thrive and access the nutrient-rich water below. Aeration is necessary to keep the water well-oxygenated, which is vital for both fish health and the uptake of nutrients by the plants. Moreover, preventing light from reaching the solution helps control algae growth, which can otherwise compete with the plants for nutrients and disrupt the balance of the system.