FIELD: agriculture.
SUBSTANCE: invention relates to commercial fishery. The method is realised by comparison of catch and readings of a hydroacoustic sonar. The hydroacoustic sonar comprises several blocks arranged on upper and lower framing ropes of the net oppositely to each other at the equal distance. The distance between blocks is calculated according to a certain dependence, based on the angular width of existing characteristics of directivity of a probing beam of a block and a value of vertical opening of the trawl net.
EFFECT: invention makes it possible to validly and in a quality manner determine selectivity of a trawl net directly in process of trawling.
1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF DETERMINING TRAWL CATCHING EFFICIENCY | 2010 |
|
RU2440589C2 |
| METHOD FOR DETERMINATION OF TRAWL CATCH EFFICIENCY | 2007 |
|
RU2346432C1 |
| APPARATUS FOR ASSESSING THE QUANTITY OF CATCH BY TRAWL IN TIME OF FISHING | 0 |
|
SU1521416A1 |
| METHOD FOR ASSESSMENT OF TRAUMATISM OF FISHES PASSING THROUGH TRAWL NETTING | 1991 |
|
RU2007914C1 |
| METHOD OF DETERMINATION OF FILLING THE BAG OF TRAWL WITH FISH | 0 |
|
SU1764601A1 |
| METHOD OF CATCHING FISH | 0 |
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SU632331A1 |
| DEVICE FOR EVALUATING SIZE OF FISH DURING FISHING | 2008 |
|
RU2367151C1 |
| HYDROACOUSTIC SYSTEM FOR MONITORING TRAWL PARAMETERS | 2010 |
|
RU2447458C1 |
| FISH FINDER | 2002 |
|
RU2229226C1 |
| TRAWL | 1999 |
|
RU2151504C1 |
