Blackburn demonstrated for CBC News Thursday by weighing a halibut in calm water at the Sambro wharf, where it weighed just under 21 pounds. When Blackburn weighed the same fish again in choppier water at the head of Sambro wharf, its weight fluctuated between 16, 27 and 30 pounds. "What do I do, take the middle number? It was 21 pounds at the wharf," he said.