. Commercial fisheries review. Fisheries; Fish trade. 18. and subsurface herringlike fishes, including menhaden, were located by sonar in Cape San Bias-Cape St. George, Florida, area. Once, 105 surface schools were visually counted on surface within 5-mile radius of vessel. When sea surface became turbulent and schools sounded, they were detected by sonar in mid- water and near-bottom areas. Water depths ranged from 4 to 9 fathoms. Simultaneous aerial photographic and sonar detection were initiated during cruise. Trips 5 and 6 concentrated in area from off Boca Grande to Fort Myers Beach, Flor
. Commercial fisheries review. Fisheries; Fish trade. 18. and subsurface herringlike fishes, including menhaden, were located by sonar in Cape San Bias-Cape St. George, Florida, area. Once, 105 surface schools were visually counted on surface within 5-mile radius of vessel. When sea surface became turbulent and schools sounded, they were detected by sonar in mid- water and near-bottom areas. Water depths ranged from 4 to 9 fathoms. Simultaneous aerial photographic and sonar detection were initiated during cruise. Trips 5 and 6 concentrated in area from off Boca Grande to Fort Myers Beach, Flor- ida, where commercial thread herring sein- ers were active. Minimum depth operational limitations of OregonII(4 fathoms) restricted sonar operations in near-shore areas, where many commercial activities were centered. However, numerous large schools (over 50 tons) were detected in offshore areas. Thread herring concentrations were found as far as 8J miles offshore in depths to 7 fathoms. Commercial vessels generally used aerial spotters. In some instances, water turbidity and lighting conditions were not favorable for reliable aerial detection--and sets were made solely on sonar information supplied by Oregon II, The value of sonar capabilities was clearly demonstrated to industry: the Oregon II returned to area in December after industry requested sonar assistance. Coordinated Approach Coordinated sonic fish-school measure- ments, aerial photography, and commercial vessel school samplings were made during November and December, Operational tech- niques and problems for this coordinated ap- proach were studied and 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. [Washin
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Keywords: ., book, bookcentury1900, booksubjectfisheries, booksubjectfishtrade
