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deep scattering layer
(English) A relatively thin layer of organisms in most oceanic waters which scatter sound; the DSL tends to raise at night, and to descend during daytime, also: A layer in mid-depths of the sea detected by echo sounders, which rises at night and sinks during the day. Composed of organisms, many of which have a gas filled chamber, such as certain jellyfish and fishes. Also called false bottom. (See also: acoustics, sonar, echo ranging)
couche dispersante profonde
(French) Une couche relativement fine des organismes dans la plupart des eaux océaniques qui éparpillent le son; la couche dispersante profonde a tendance de monter le soir, et de descendre pendant la journée. (See also: acoustics, sonar, echo ranging)
(Portuguese) Estrato composto de organismos existente na maior parte das águas oceânicas que reflectem ondas sonoras. Este estrato orgânico sobe na coluna de água à noite desce durante o dia. (See also: acoustics, sonar, echo ranging)

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