'The Korea Society of Information Technology Services'
Abstract
Height and spread of trawls is successfully measured by the
wireless "Scanmar" system. Several experiments made by
fishermen have shown that this system will not work on the
Danish seine. A modified version of the "Scanmar" system have
been tested for geometrical measurements on the Danish seine.
During May 1987 a total of 11 valid hauls were made by two
different types of Danish seines on fishing grounds in
Northern Norway. Hauling and fishing procedures were carried
out as in the normal, commercial fishery.
The measurements clearly demonstrated that it is possible to
control the geometry of the Danish seine throughout the haul
by this modified version of the "Scanmar" system. In addition to read the height and spread of the net, it was possible to
detect whenever a rope got fastened around rocks, and to see
when it loosened again. Signals from the height and spread
sensors were lost for shorter periods during the haul.
Using this (modified version of the) system, the skipper will
get continuous information about the geometry of the Danish
seine, and thereby know exactly when to start hauling the
ropes and when to change the hauling speed, in order to keep
a steady/continous closing of the wings