1. Exclusion: Install netting over the pond to prevent the hawks from accessing the water. Ensure that the netting is strong and durable, and secure it tightly around the edges of the pond.
2. Falconry: Employ falconry services. A trained falconer can use their bird of prey to scare away the hawks.
3. Visual Deterrents: Place objects that might discourage hawks, such as reflective tape, large balloons, or fake owls, around the pond.
4. Noise Deterrents: Use ultrasonic devices or motion-activated sprinklers. Such deterrents can emit sudden bursts of noise or water to startle the hawks.
5. Habitat Modifications: Remove any perching spots near the pond that the hawks might use to survey the area for prey.
6. Guard Animals: Having dogs, waterfowl guardian geese, or other protective animals present can deter hawks.
7. Provide Cover: Introduce plants, floating vegetation, or structures on the pond's surface to provide some hiding spots for the fish.
8. Scare Tactics: If you see a hawk, attempt to scare it off by making loud noises, waving your arms, or clapping.
Remember that the best approach may depend on the specific circumstances and the local environment. A combination of methods may be necessary for effective deterrence.