Explain why this system may cause fewer environmental impacts than systems thatfarm only fish.

The question seems to be referring to an aquaponic system, which is a combination of aquaculture (raising fish) and hydroponics (growing plants without soil). Here's why this system may cause fewer environmental impacts than systems that farm only fish:

1. Reduced Water Usage: Aquaponic systems recycle water. The water from the fish tank, rich in fish waste, is used to irrigate and fertilize the plants. The plants, in turn, filter and clean the water, which is then recirculated back to the fish tank. This significantly reduces the amount of water needed compared to traditional fish farming.

2. No Chemical Fertilizers or Pesticides: In aquaponics, the fish waste provides a natural source of fertilizer for the plants. This eliminates the need for chemical fertilizers, which can be harmful to the environment. Similarly, because the system is typically closed and controlled, there's less need for pesticides.

3. Reduced Land Usage: Aquaponic systems can be set up vertically, which means they use less land than traditional farming methods. This can help to reduce deforestation and habitat destruction.

4. Less Waste: In traditional fish farming, a lot of waste is produced, which can pollute the surrounding environment. In an aquaponic system, however, the fish waste is used to feed the plants, turning what would be waste into a valuable resource.

5. Lower Carbon Footprint: Because aquaponic systems can be set up almost anywhere, they can reduce the need for long-distance transportation of food. This can significantly lower the carbon footprint of food production.

In conclusion, aquaponic systems can potentially have fewer environmental impacts than systems that farm only fish due to their efficient use of resources and reduced waste production.