FIELD: agriculture.
SUBSTANCE: method implies use of hydroacoustic echo-ranging device to determine amount of fish in front of trawl. Hydroacoustic echo-ranging device may be installed at one and/or both trawl boards. Echo ranging of target stocks in the space between trawl boards and trawl wings is carried out either from one board towards the other board or from both boards alternately towards one another. Sound impulses are emitted simultaneously or alternately. Then number of caught fish is divided by total number of fish in front of trawl to determine catch efficiency.
EFFECT: improved accuracy and reliability of determination of fish amount in the trawl operating range.
2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF DETERMINING TRAWL CATCHING EFFICIENCY | 2010 |
|
RU2440589C2 |
| METHOD FOR DETERMINING OF TRAWL NET CATCHING COEFFICIENT | 2003 |
|
RU2275021C2 |
| METHOD TO DEFINE SELECTIVITY OF TRAWL NET | 2012 |
|
RU2483535C1 |
| FISH CATCHING TRAWL | 1998 |
|
RU2140736C1 |
| FISHING TRAWL | 2000 |
|
RU2185729C2 |
| METHOD OF DETERMINATION OF POSITION OF TRAWL RELATIVE TO SHOAL OF FISH IN COURSE OF TRAWLING | 1992 |
|
RU2061369C1 |
| FISHING TRAWL | 1997 |
|
RU2122788C1 |
| TRAWL | 1999 |
|
RU2151504C1 |
| TRAWL SYSTEM FOR TRAWLING HYDROBIONTS | 0 |
|
SU1671212A1 |
| FISHING BEAM TRAWL | 0 |
|
SU902693A1 |
