"The primary objective of the study was to estimate abundances of the dolphin stocks affected by the ETP purse-seine fishery for yellowfin tuna (Thunnus albacares). The survey's design targeted the depleted stocks of eastern spinner dolphins (Stenella longirostris orientalis) and the northeastern offshore stock of spotted dolphins (Stenella attenuata). In addition to data suitable for line-transect analysis, behavioral, acoustic, photogrammetric, genetic, morphological, and individual whale identification data were collected on the region's cetaceans and are described in this report"--Survey objectives (page 2).

National Marine Fisheries Service (NMFS)

Pacific Ocean