Trawl Eye – an advanced “echo sounder” placed on the trawl

Trawl-EyeThe 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

 
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)

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

 
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

 

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

 
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

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