DOUBLE -RIG SHRIMP TRAWLING ,ITS RIGGING ,COMPARATIVE EFFICIENCY AND ECONOMICS.

Abstract

A radical and revolutionary change from the hitherto
employed shrimp trawling is reported for better productivity
and economy in deep sea trawling with medium and large
vessels. Studies carried out off Veraval with a 13.7 m. four
seam shrimp trawl as conv~ntional single-rig and two 6.8 m.
four seam shrimp trawls as double-rig from a 15.2 m. fishing
vessel showed an increase of 98% shrimp catch by doub]e-rig
over single-rig at 86.3 % of the power utilised by the latter.
It has also been worked out, theoretically, how better this
available power can be utilised for further improvement of catch.
An increase of 15% head rope length in case of double-rig
over the optimum single-rig gear of any vessel is recommended.