Trawl Eye – an advanced “echo sounder” placed on the trawl
The Trawl Eye is Scanmar’s most advanced sensor. M ore than a thousand Trawl Eye s have been sold si nce their introduction in 1990 and we are still alone in the market with such an advanced sensor. The Trawl Eye is suitable for use in bottom trawling as well as pelagic trawling in most fisheries around the world. Many of the species are in fact impossible to see on an echo sounder or sonar, and trawl ing without a Trawl Eye is like fishing blindfolded.
Because the Trawl Eye , when placed on the headlin e, is close to where the fish are , it has much better detecting ability than anything corresponding ly mounted on the vessel. A skipper with experience will therefore easily determine whether it is fish or bait, and if he is fishing for the “right speci es” and not wasting time and resources unnecessarily.
More and more of those who do pelagic trawling hav e begun to use an extra Trawl Eye in the belly, often together with a Flow sensor or an Angle sensor, in order to ensure that what they see in the trawl opening ends up in the back of the bag.
TWO DIFFERENT TYPES OF TRAWL EYE
With the many areas of appl ication and different fisheries, Scanmar was quick to see the need for two variations of the Trawl Eye . The broad beam Trawl Eye was fi r st introduced to the marke t intended for trawls with low opening and is today largely used for catching white fish. In f ishing for shrimp or species that keep close to the seabed, the narrow beam Trawl Eye usually offers the best detection abilities.
Narrow beam Trawl Eye is usually used in pelagic trawling as well.
WIDE BEAM |
ECHO SOUNDER |
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Low opening trawls | Frequency | 97 kHz | |
Frequency Beam width: Wide beam Narrow beam |
40 deg / 40 deg (- 3 dB) 40 deg / 20 deg (- 3 dB) |
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NARROW BEAM |
Range, up / down | 15, 30, 60, 90, 120, 150 m | |
High opening trawls | Range down only | 180, 240, 300 m | |
Vertical resolution | 0,15 til 0,75 m | ||
OPERATION |
WEIGHT |
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Update rate fast | medium | slow | 1,3 sec | 3,2 sec | 4,2 sec | In air | 11,7 kg (including battery) |
Max. depth | 1200 m | In water | 4,3 kg (including battery) |
Operation time | 15-45 hrs* |
MAIN DIMENSIONS |
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BATTERY |
Length | 315 mm | |
Type | NiCd, 10,8V / 5,0 Ah | Width | 259 mm |
Charging time | Typically: 5 hrs (TBC-05) | Height | 128 mm |
UPLINK |
ACCESSORIES |
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Frequency range | 43,6 – 46,3 kHz | Protective housing | 105010 |
Beam width | 70 deg | Battery pack | 105570 |
Range to vessel | Appx. 2 000 m* | Battery charger | TBC-05 |
Note: All specifications are subject to change without prior notice.
*Depends on power setting, update rate and echo-sounder gain
*Depends on acoustical conditions, ships noise,mounting and alignment of sensor and hydrophone