. Commercial fisheries review. Fisheries; Fish trade. 39. Fig. 1 - Offshore survey track chart, 'Charles H. Gilbert1 cruise 117, January 30-April 14, 1970, showing locations of tag releases "T" and large schools "X. " 'Gilbert'. The troll catches included 46 skip- jack tuna, 30 yellowfin tuna, 31 kawakawa, 2 dolphin, and 1 shortbill spearfish, Tetrap- turus angustirostris. Environmental Conditions The surface temperatures recorded by expendable and m e c h ani c al bathythermo- graphs around the Samoa Islands during the survey ranged between 28° and 30° C. The thermocline d
. Commercial fisheries review. Fisheries; Fish trade. 39. Fig. 1 - Offshore survey track chart, 'Charles H. Gilbert1 cruise 117, January 30-April 14, 1970, showing locations of tag releases "T" and large schools "X. " 'Gilbert'. The troll catches included 46 skip- jack tuna, 30 yellowfin tuna, 31 kawakawa, 2 dolphin, and 1 shortbill spearfish, Tetrap- turus angustirostris. Environmental Conditions The surface temperatures recorded by expendable and m e c h ani c al bathythermo- graphs around the Samoa Islands during the survey ranged between 28° and 30° C. The thermocline depths were usually 30 to 60 meters ranging from 20 to 78 meters. The thermocline was not as "sharp" as that en- countered in the Equatorial Countercurrent and the eastern tropical Pacific. Tempera- tures were typically 25°-27° C. at a depth of 100 meters; 20°-23° C. at 200 meters; and 15°-16° C. at 300 meters. The weather changed rapidly in the area, with seas mostly moderate and winds usually blowing from points between northeast and southeast. The water color was the typical deep blue of the open tropical Pacific. Transported Bait Prior to leaving Honolulu, 135 buckets of threadfin shad, Dorosoma petenense, were loaded into three baitwells aboard the 'Gil- bert' for use as live bait in pole-and-line fishing. The shad had been acclimated to sea water and were held in swimming pools for several months prior to the cruise. Shad mortalities were high during the rough 10-day voyage to Samoa. Only 30 buckets survived, but these worked well as chum duringthe first offshore survey for as long as they were avail- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. National Marine Fisheries Service; U. S. Fish and Wildlife Service; United States. Bureau of Commericial Fisheries. [
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