Catching zone for various trajectories of Danish seining
Principle of catching zone formation is considered and formulas are proposed to account the catching area for various trajectories of Danish seine. The catching area depends on sagging part of drag lines, which is defined by angle of the drag lines inclination to the sea surface. The way to define this angle is offered, and the error of catching area definition is determined in dependence on the error of the angle measurement. Change of the catching zone depends on dynamics of the Danish seine movement. On an example of experiments conducted in Peter the Great Bay, an opportunity is shown to estimate density of fish congestions by results of Danish seining. Further prospects of the Danish seine using for surveys of marine biological resources are designed.