Last Updated：2026/01/01
Sentence
In
the
early
1980s
the
Warty
comb
jelly
or
Sea
walnut
was
introduced
(probably
from
the
ballast
water
of
ships
from
North
America)
to
the
Black
Sea,
a
habitat
in
which
it
had
no
natural
predators.
By
the
summer
of
1989
it
was
proliferating
in
such
numbers
and
consuming
so
much
plankton
in
the
Black
Sea
that
the
fisheries
dependent
on
the
plankton
crashed.
Quizzes for review
In the early 1980s the Warty comb jelly or Sea walnut was introduced (probably from the ballast water of ships from North America) to the Black Sea, a habitat in which it had no natural predators. By the summer of 1989 it was proliferating in such numbers and consuming so much plankton in the Black Sea that the fisheries dependent on the plankton crashed.
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