Last Updated：2025/12/08
(oceanography) A layer of the ocean lying usually 300-500 metres deep composed of dense concentrations of pelagic animal life, that moves depending on the time of day, up at night and down during the day. It sometimes appear as if it were the seabed on sonar scopes, due to the density of life in the layer.
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deep scattering layer
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Source Word
deep scattering layer
Noun
(oceanography)
A
layer
of
the
ocean
lying
usually
300-500
metres
deep
composed
of
dense
concentrations
of
pelagic
animal
life,
that
moves
depending
on
the
time
of
day,
up
at
night
and
down
during
the
day.
It
sometimes
appear
as
if
it
were
the
seabed
on
sonar
scopes,
due
to
the
density
of
life
in
the
layer.
Japanese Meaning
海洋学における、水深300～500メートル付近に存在する一層であり、浮遊性の動物が密集して生息する層を指す。 / この層は、日中は深い水域に、夜間は表層へと移動する動的な性質を持ち、ソナー上では生物の密集により海底と誤認されることがある。
Sense（1）
(oceanography)
A
layer
of
the
ocean
lying
usually
300-500
metres
deep
composed
of
dense
concentrations
of
pelagic
animal
life,
that
moves
depending
on
the
time
of
day,
up
at
night
and
down
during
the
day.
It
sometimes
appear
as
if
it
were
the
seabed
on
sonar
scopes,
due
to
the
density
of
life
in
the
layer.
（ plural ）
