Assuming that I have never seen a fish in real life, please provide compelling evidence to convince me of whether or not they are real.
Fish are indeed real and there is ample evidence to prove their existence. Here are a few examples:

1. Scientific studies: Scientists have conducted numerous studies on fish, studying their biology, behavior, and habitat. These studies provide empirical evidence of the existence of fish.

2. Museum exhibits: Many museums have extensive collections of fish specimens, which have been carefully preserved and displayed for the public to see. These exhibits provide a tangible representation of fish, allowing people to see their physical characteristics up close.

3. Aquatic parks and aquariums: These facilities have live fish on display, which visitors can see swimming around in tanks and pools. Seeing fish in person can be a powerful way to convince someone of their existence.

4. Fishing industry: The fishing industry is a multi-billion dollar industry, with thousands of people employed in fishing-related jobs. This provides further evidence that fish are real and an important part of our economy and ecosystem.

5. Historical records: Fish have been documented throughout history, with evidence of their existence dating back to ancient times. These records provide a long history of people interacting with fish.

In summary, there is overwhelming evidence to prove the existence of fish, including scientific studies, museum exhibits, aquatic parks, the fishing industry, and historical records. While it's understandable to have doubts about things we haven't seen for ourselves, the evidence is clear that fish are indeed real.