Publication Date:
2022-05-26
Description:
Reprint. Science, vol. 160, no. 3831, 1968, pp. 991-993. Originally issued as Reference No. 68-58, series later renamed WHOI-.
Description:
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.
Description:
Supported in part by contracts Nonr-3484(00)
and Nonr-4029(00) and by NSF grant GB-4431.
Keywords:
Alvin (Submarine)
;
Lanternfishes
;
Echo scattering layers
Repository Name:
Woods Hole Open Access Server
Type:
Technical Report
Format:
application/pdf
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