Underwater visual survey methodology used to count Atlantic salmon (Salmo Salar) in rivers of St. George’s Bay, Newfoundland / by T.R. Porter, G. Clarke, and J. Murray.: Fs97-6/3126E-PDF

"The abundance of spawners is an important parameter in assessing the status of Atlantic Salmon (Salmo salar) stocks. The most common technique used to estimate abundance of Atlantic Salmon spawners in Newfoundland and Labrador is fish counting fences or weirs. However, this technique is expensive and not always logistically feasible in many rivers. In 1996, underwater visual surveys were initiated to count Atlantic Salmon in five rivers in St. George’s Bay, Newfoundland. The technique involved swimmers using snorkelling gear and floating downstream. This method was found to be an effective, versatile and low cost means of estimating Atlantic Salmon abundance. This report describes various types of visual surveys, the biological and environmental conditions that influenced accuracy and precision of the counts, particularly with reference to underwater visual surveys, and provides a detailed description of the methodology used in the visual surveys conducted in St. George’s Bay rivers”--Abstract, p. v.

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