Ceratoscopelus maderensis : pecular sound-scattering layer identified with this myctophid fish
Backus, Richard H.
Craddock, James E.
Haedrich, Richard L.
Shores, D. L.
Teal, John M.
Wing, A. S.
Mead, Giles W.
Clarke, William D.
MetadataShow full item record
LocationWestern North Atlantic
A sound- scattering layer, composed of discrete hyperbolic echo-sequences and apparently restricted to the Slope Water region of the western North Atlantic, has been identified from the Deep Submergence Research Vehicle ALVIN with schools of the myctophid fish Ceratoscopelus maderensis. By diving into the layer and using ALVIN's echo-ranging sonar, we approached and visually identified the sound scatterers. The number of echo sequences observed with the surface echo-sounder (1 /23. 76 x 105 cubic meters of water) checked roughly with the number of sonar targets observed from the submarine (1/7. 45 x 105 cubic meters) . The fish schools appeared to be 5 to 10 meters thick, 10 to 100 meters in diameter, and on centers 100 to 200 meters apart. Density within schools was estimated at 10 to 15 fish per cubic meter.
Reprint. Science, vol. 160, no. 3831, 1968, pp. 991-993. Originally issued as Reference No. 68-58, series later renamed WHOI-.
Suggested CitationTechnical Report: Backus, Richard H., Craddock, James E., Haedrich, Richard L., Shores, D. L., Teal, John M., Wing, A. S., Mead, Giles W., Clarke, William D., "Ceratoscopelus maderensis : pecular sound-scattering layer identified with this myctophid fish", 1968-10, DOI:10.1575/1912/7406, https://hdl.handle.net/1912/7406
Showing items related by title, author, creator and subject.
Klevjer, Thor A.; Torres, Daniel J.; Kaartvedt, Stein (Springer, 2012-06-13)The mesopelagic zone of the Red Sea represents an extreme environment due to low food concentrations, high temperatures and low oxygen waters. Nevertheless, a 38 kHz echosounder identified at least four distinct ...
High Latitude epipelagic and mesopelagic scattering layers—a reference for future Arctic ecosystem change Knutsen, Tor; Wiebe, Peter; Gjøsæter, Harald; Ingvaldsen, Randi B.; Lien, Gunnar (Frontiers Media, 2017-11-01)Scattering structures, including deep (>200 m) scattering layers are common in most oceans, but have not previously been properly documented in the Arctic Ocean. In this work, we combine acoustic data for distribution and ...
Sediment resuspension and nepheloid layers induced by long internal solitary waves shoaling orthogonally on uniform slopes Bourgault, Daniel; Morsilli, M.; Richards, Clark G.; Neumeier, U.; Kelley, Daniel E. (2013-10-20)Two-dimensional, nonlinear and nonhydrostatic field-scale numerical simulations are used to examine the resuspension, dispersal and transport of mud-like sediment caused by the shoaling and breaking of long internal ...