. Commercial fisheries review. Fisheries; Fish trade. Fig. 4 - Sonar paper tape of fish school circled in fig. 3. The scale is calibrated in fathoms, and the effective range of the sonar extends beyond the scale in this illustration. Measure- ments of this fish school are given in table. The vessel returned to the area of fishing off west Florida during December when the fishing industry asked for sonar assistance. As a consequence of this sonar demonstra- tion, some industrial fish companies have considered equipping vessels with sonar. This preliminary sonar experience has provided a nucleus
. Commercial fisheries review. Fisheries; Fish trade. Fig. 4 - Sonar paper tape of fish school circled in fig. 3. The scale is calibrated in fathoms, and the effective range of the sonar extends beyond the scale in this illustration. Measure- ments of this fish school are given in table. The vessel returned to the area of fishing off west Florida during December when the fishing industry asked for sonar assistance. As a consequence of this sonar demonstra- tion, some industrial fish companies have considered equipping vessels with sonar. This preliminary sonar experience has provided a nucleus of trained sonar operators. Fig. 5 -Aerial photograph of fish schools (thread herring) show- ing variability in their surface configurations. A dye marker dropped by the photo airplane can be seen near the Oregon II, who familiarized other Base personnel with applicationsof fishery sonar. For the reader interested in the principles of sonar opera- tion and fishing tactics, this information is presented in two books by D, G. Tucker, "Underwater Observations Using Sonar" and "Sonar in Fisheries, "both published by Fish- ing News (Books) Ltd., London. Our early field work has revealed prob- lems associated with acoustical measuring techniques and has provided sufficient back- ground experience to develop program aims and equipment requirements for future ef- forts of acoustic fish-school 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. [Washington] : National Marine Fisheries Service; [for sale by the Supt. of Docs. , U. S. Govt. Print. Off. ]
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Keywords: ., book, bookcentury1900, booksubjectfisheries, booksubjectfishtrade
