Download or read book Acoustical and Biological Studies of the Deep Scattering Layer in the Eastern North Pacific written by William Irwin Aron and published by . This book was released on 1967 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book FASOR II written by Peter F. Seligman and published by . This book was released on 1975 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of an International Symposium on Biological Sound Scattering in the Ocean written by United States. Naval Oceanographic Office and published by . This book was released on 1970 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustical and Biological Results of Sampling in the Deep Scattering Layers written by Charles L Brown (Jr) and published by . This book was released on 1969 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deep scattering layers (DSL) present formidable interference to underwater acoustic systems in large areas of the Atlantic and Pacific Ocean. This interference is due to volume reverberation from the DSL and appears to be caused primarily by the backscattering of sound from fish possessing gas-filled swim-bladders. From a deep research vehicle, samples of organisms were taken successively below, in, and above the DSL in an area of the western North Atlantic during August 1966. Mere numbers of fish did not appear significant in determining the acoustic properties of the DSL. From results of the biological sampling, scattering strengths have been calculated for single frequencies of 4 kHz and 12 kHz, as well as for several frequency bands. The results near 12 kHz agree reasonably well with experimental values for similar areas, but results near 4 kHz are somewhat lower than those of other investigations. (Author).

Download or read book International Symposium on Biological Sound Scattering in the Ocean Airlie House 1970 written by G. Brooke Farquhar and published by . This book was released on 1971 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biological Sound Scattering Studies written by United States. Naval Oceanographic Office and published by . This book was released on 1970 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings written by G. Brooke Farquhar and published by . This book was released on 1971 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book MC Reports written by United States. Navy Department and published by . This book was released on with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings Mar 31 Apr 2 1970 Airlie House Conference Center Warrenton Va written by G. Brooke Farquhar and published by . This book was released on 1971 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biological Sound Scattering Studies Part I Initial Investigations in the Gulf of Mexico and Western North Atlantic written by Bernard J. Zahuranec and published by . This book was released on 1970 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1964 the Acoustical Oceanography Branch of the U.S. Naval Oceanographic Office has conducted bioacoustic investigations of deep scattering layers (DSL) in the Atlantic Ocean. The initial investigations before May 1967 were conducted primarily in three regions: the Gulf of Mexico, the southwestern Sargasso Sea, and the Gulf Stream. Biological collections at discrete depths were attempted with a six foot Isaacs-Kidd Midwater Trawl and a Be Multiple Plankton Sampler. The biological collections were sorted and identified to species (fish and some invertebrates) or to major groups (most invertebrates). The most abundant kinds of fishes collected belong to the families Myctophidae (Lanternfishes) and Gonostomatidae (bristlemouths). In general, 2 or 3 species of fishes in a collection were found to be more abundant than the rest, often making up the majority of fish in a sample. Investigation of the night surface scattering layers in the Gulf of Mexico in March 1967 indicates that the fish in these layers tend to be concentrated in a narrow depth range. Measurements in the Sargasso Sea in November 1965 show some correlation between the depth of occurrence of a deep scattering layer, an oxygen deficient layer, and an abundance of organisms. Collections from both areas as well as in the Gulf Stream agree with the concept that all three are regions of low productivity. Although a strong correlation was not established between DSL occurrence and the biological collections, these initial investigations suggest several findings that merit more intensive body. (Author).

Download or read book National Marine Sciences Program written by United States. Congress. House. Committee on Merchant Marine and Fisheries. Subcommittee on Oceanography and published by . This book was released on 1968 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Marine Sciences Program written by United States. Congress. House Merchant Marine and Fisheries and published by . This book was released on 1968 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1967 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hearings written by United States. Congress. House. Committee on Merchant Marine and Fisheries and published by . This book was released on 1967 with total page 1294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessment Of Sound Scattering Layer At The Interface Of North Pacific Equatorial Water And Eastern North Pacific Central Water Mass written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hearings Reports and Prints of the House Committee on Merchant Marine and Fisheries written by United States. Congress. House. Committee on Merchant Marine and Fisheries and published by . This book was released on 1968 with total page 1480 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Marine Sciences Programs written by United States. Congress. House. Committee on Merchant Marine and Fisheries. Subcommittee on Oceanography and published by . This book was released on 1968 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Committee Serial No. 90-19. Reviews progress made by Federal departments in planning and implementing marine sciences programs in areas of food supply, energy, national security and marine safety.