Physical, Chemical, Current Measurement and Biological Data Swan Song Expedition 21 August – 1 December 1961

Work on the last three legs of the Swan Song Expedition (5 September-1 December 1961) aboard the RV Argo was concentrated on the study of the Cromwell Current. The specific purpose was to determine how the Cromwell Current broke down as it travelled eastward toward and beyond the Galapagos Islands. On the last two legs of the expedition a limited biological program was conducted by members of the Inter-American Tropical Tuna Commission (IATTC). This report includes most of the pertinent data concerned with the Cromwell Current study, namely some 91 hydrographic stations and 65 current measuring stations as well as most of the data from the 29 biological stations and 42 primary productivity observations (the latter group of which were made while the ship was underway)