Table 2.

Comparison of estimated detection distances from wild and captive harbour porpoises to a fish, a gillnet and for an acoustic data logger

Wild porpoisesCaptive porpoises*
Fish40 m10 m
Gillnet13-26 m3-6 m
T-POD260-400 m38-85 m
• The calculations are based on assumptions described in the text and should only be regarded as very coarse estimates.

• * Data from Kastelein et al. (Kastelein et al., 1999; Kastelein et al., 2000) was used in the calculations.