Notus Electronics - Trawlmaster for Single Trawls

By: Notus  09-12-2011
Keywords: Fish, Depth Sensors, Trawl Door

Overview

Are my doors trawl wires marked correctly?  Is my trawl spread optimally?  Is the trawl on bottom?  The Trawlmaster provides the answers by attaching smallest robust trawl sensors to the gear.  All information is transmitted to the vessel wirelessly.

Capabilities

  • Adjust vessel speed to keep optimal doorspread.
  • Indicates when your doors have crossed
  • Detects when your door has fallen or is stuck

Trawl Warp Measurement
The distance from the vessel to EACH trawl door

  • Accurately measures your trawl wires to within 1/2 meter.
  • Avoids measuring your trawl wires on shore.
  • Indicates the adjustment in cross current to "square" the doors.

Door Angle
The heel angle (inward/outward lean) and pitch angle (upward/downward pitch)

  • Instantly indicates if you shoot too much trawl wire as the door heels over.
  • Indicates when the doors are on bottom. 

Headline Height
Indicates the distance from the headline to the seafloor.

  • Add a footline slave to receive footgear clearance.
  • Indicates when your trawl is on bottom
  • Allows you to raise and lower the headline depending on species and trawling conditions

Catch
Indicates when the cod-end is full

  • Only take back what you can handle onboard
  • Prevents hauling back a trawl that is only half full
  • Provides a better indication of exactly where the fish are in the tow

Bottom Contact
Indicates if the trawl is on bottom

  • Fishing is greatly reduced once your trawl comes off bottom
  • Indicates if your speed into the current is taking the trawl off bottom.
  • If you do not shoot enough trawl wire, the trawl will not be on bottom

Door Depth
Depth sensors indicate the distance from the surface to the doors/trawl

  • When mid watering, trawl depth allows you to place the trawl at depth of the fish.
  • When bottom trawling, depth will indicate when the gear is on bottom.

Temperature

  • Locate larger schools by trawling in the right temperature range.
  • Improve quality by storing fish near the temperature of the seawater.
  • Determine where the fish are

Grid Angle
 Indicates angle of the sorting grid.

  • If your grid is not at the right angle, nothing goes to the cod-end.
  • Indicates if your grid is blocked
  • Estimate fish volume in the codend as the grid angle tends to increase with volume.

Wingend Spread
Provides the distance between the wingends.

  • Wingspread is a critical piece of information for researchers in calculating swept area

Trawl Alignment

 Indicates the alignment behind the doors.

  • Calculates the distance from the starb door to the headline and from the port door to the headline.
  • Indicates the adjustment in side current and when turning.
  • Trawl angles are also calculated to ensure gear has correct hearding effect.

Keywords: Depth Sensors, Fish, Trawl Door, Trawl Wire,

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