262
THE SEAS
dredge
”
(Fig. 54).
This varies in dimensions according
to the size of the ship from which it is to be used,- but in
essentials it consists of a rectangular or triangular shaped
frame of
which is attached a short bag of str0ng
netting.
The mesh of the net depends on the size “of the
animals that” are to be caught.
The frame at the mouth
of the net has sharp bevelled edges which can dig through
the sand and gravel, and will scrape off any animals that
are xed tight to the rocks.
This net is used for all sluggish
bottom animals such as starsh, shellsh and sea urchins,
and also for those animals that burrow in the surface
layers of the sand or mud.—
_
_
.
’
"'—_"
.
-
___—_: °
_
.…
__
._
—âËäz
_
\
-
'
Fm. 54.——Anatùràlist"s dredge.
For the swimming animals nets similar to those used by
shermen are employed. These, consisting of trawls,
drift nets and seines, will be described in detail in the
chapter on the sea—sheries.
In addition a small net
known
the Agassiz traw1, named after
inventor,
is used for deep—sea work (Plate’g4)
net has the
'
advantage that whichever way it‘
fall on the sea
,
bottom it can'still sh -eectively, & very imp0rtant point
when shing in great depths, as it is impossible to ensure
that the net may not turn over several times in its long
journey
to the bottom.
,
,
'
‘
_
.»
THE SEAS
dredge
”
(Fig. 54).
This varies in dimensions according
to the size of the ship from which it is to be used,- but in
essentials it consists of a rectangular or triangular shaped
frame of
which is attached a short bag of str0ng
netting.
The mesh of the net depends on the size “of the
animals that” are to be caught.
The frame at the mouth
of the net has sharp bevelled edges which can dig through
the sand and gravel, and will scrape off any animals that
are xed tight to the rocks.
This net is used for all sluggish
bottom animals such as starsh, shellsh and sea urchins,
and also for those animals that burrow in the surface
layers of the sand or mud.—
_
_
.
’
"'—_"
.
-
___—_: °
_
.…
__
._
—âËäz
_
\
-
'
Fm. 54.——Anatùràlist"s dredge.
For the swimming animals nets similar to those used by
shermen are employed. These, consisting of trawls,
drift nets and seines, will be described in detail in the
chapter on the sea—sheries.
In addition a small net
known
the Agassiz traw1, named after
inventor,
is used for deep—sea work (Plate’g4)
net has the
'
advantage that whichever way it‘
fall on the sea
,
bottom it can'still sh -eectively, & very imp0rtant point
when shing in great depths, as it is impossible to ensure
that the net may not turn over several times in its long
journey
to the bottom.
,
,
'
‘
_
.»