Table 2. Relative bias for different fish speeds for belt-transect surveys where survey time = 300 s, transect width = 4 m, visibility distance = 20 m, diver speed = 1 m·min⁻¹, fish turning angle = 45°.

Fish speed (m·s−1)	Relative bias
0	0.01
0.001	0.03
0.01	0.13
0.1	1.28
0.2	2.92
0.4	6.72
0.6	10.99
0.8	15.47
1	20.51
2	47.99
4	107.97

The diver visually surveyed an area of 100 m².