No, just the opposite. The pic does not provide enough information to determine how large the halibut actually is. It could be almost anything, including 25lbs or 900lbs.

That's why I'm confused by your response. How can you tell this fish weighs something close to 900lbs? On what information are you basing your conclusion?

I would note that at 986lbs, the fish would be just about twice as large as the largest halibut ever caught.

As the old saying goes, "Extraordinary claims require extraordinary evidence".