. Commercial fisheries review. Fisheries; Fish trade. ARTICLES DETECTION OF FISH SCHOOLS BY SONAR (Eastern Tropical Pacific, July-November 1967) By Robert I. McClendon* In 1967 an investigation of the physical and biological oceanography of the eastern tropical Pacific was begun. This program, known as EASTROPAC, is intended to provide the nec- essary data for more effective use of marine resources of the area, especially tropical tunas. The investigation is coordinated by the Bureau of Commercial Fisheries (BCF) at its Fishery-Oceanography Center, La Jolla, Cali- fornia. Other United States G
. Commercial fisheries review. Fisheries; Fish trade. ARTICLES DETECTION OF FISH SCHOOLS BY SONAR (Eastern Tropical Pacific, July-November 1967) By Robert I. McClendon* In 1967 an investigation of the physical and biological oceanography of the eastern tropical Pacific was begun. This program, known as EASTROPAC, is intended to provide the nec- essary data for more effective use of marine resources of the area, especially tropical tunas. The investigation is coordinated by the Bureau of Commercial Fisheries (BCF) at its Fishery-Oceanography Center, La Jolla, Cali- fornia. Other United States Government agen- cies participating are the Coast Guard, En- vironmental Science Services Administration, The Naval Oceanographic Office, and the Smithsonian Institution. Other participants include the Scripps Institution of Oceanography of the University of California San Diego, Texas A& M University, and the University of Miami, Coral Gables, Florida. International cooperation is given by the Inter-American Tropical Tuna Commission at the Fishery- Oceanography C ent e r, and its member na- tions--Chile, Ecuador, Mexico, and Peru. The area from 20° N. to20° S. and from the coast of South America to 126° W. is covered by multiple-ship (4 to 5 vessels) survey cruises. Single-vessel monitoring cruises are made bimonthly from 20° N. to 20° S. andfrom 98° W. to 119° W. This report concerns occurrence of fish schools as determined from the sonardata col- lected aboard the BCF research vessel "David Starr Jordan" (fig. 1) on two EASTROPAC monitoring cruises during July 10 through No- vember 27, 1967. Because data for Legs 1 and 2 for these two cruises were not available for comparison, only the information from Aca- pulco, Mexico, to the end of the cruise was used. The number of targets encountered on each cruise maybe used as a measure of pro- ductivity and fish population in the area cov- ered. A target is defined as any object in the open sea that appears on th
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