Challenges of implementing Mark-recapture studies on poorly marked gregarious delphinids
Fig 2
Nick/notch distinctiveness (ND) categories used to examine adult common dolphin (Delphinus sp.) images in the Hauraki Gulf, New Zealand.
Individuals were classified as: highly distinctive (D1); distinctive (D2), or; non-distinctive (D3) [1, 4]. The relative depth of the largest nick/notch was determined by dividing the depth of the nick/notch (as measured on a photograph) by the total length of the base of the dorsal fin [101].