APPARATUS FOR MONITORING FOOD-FISH WATER AREA Russian patent published in 2002 - IPC

FIELD: commercial fishing equipment. SUBSTANCE: net device has at least two cascade-type catches made in the form of equilateral netted three- surfaced prisms equipped with load arranged along lower seine rope and with float arranged along upper seine rope, lifting chutes, and inlet mouths. Catches are connected through rectangular guiding wings. Catches are sequentially arranged in "catch - guiding wing - catch" pattern. Guiding wings are positioned in single plane with sides of cascade-type catches. Upper and lower seine ropes of guiding wings make continuation of upper and one of lower seine ropes of catches. Number of cascade-type catches in order is greater by one than those of guiding wings. End catches of cascade row have one inlet mouth arranged at the side of guiding wing. Length of guiding wings directly depends upon loading of lower seine ropes of guiding wing and catch of cascade order to provide for tight adherence of catch base to ground. Volume of float on upper seine ropes of guiding wing and catch of cascade order is designed to provide for inclination angle of guiding wing less than 90 deg. EFFECT: increased efficiency by maximal useful qualitative and quantitative arrangement of fishing marine in food-fish water area. 3 cl, 2 dwg