TRAWLING
Trawling uses a net in a cone-shape which is
towed along the ocean
bottom to catch many species of groundfish.
Trawls take their name
from the rectangular "doors" or
"otterboard" that are attached to
cables between the boat and the net. These doors
serve to keep the
mouth of the net horizontally open while the net
is making its tow.
A vertical opening is maintained by weights on
the bottom, floats
on the top, and the water pressure generated
from towing. The net traps
fish in the end of the bag-like section, or
"cod-end", which has a mesh
size that permits on the smaller fish to escape.
The net rolls along
close to the bottom with aid of bobbins, which
are similar in appearance
to wheels.
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