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Net Monitoring Equipment

Overview

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

Capabilities

Doorspread
The spread on EACH net is provided.  Spread information reduces fuel by allowing you to keep the optimal door spread.

  • Allows you to take equal bulk in EACH net.
  • Adjust vessel speed to keep optimal doorspread.
  • Indicates when the footgear is going into the mud.

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.

Middle Wire Adjustment

The middle wire adjustment is calculated to align the middle weight (clump) with the doors.

  • When the clump is ahead of the doors, the trawls overspread.
  • When the clump is behind the doors, the trawls under spread which increases gear damage.

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

  • Set the trawl doors for optimal spread and optimal fuel consumption.
  • 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.

  • Indicates when your trawls are on bottom.
  • Allows you to raise and lower the headlines depending on species.

Catch
Indicates when the cod-end is full.

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

Bottom Contact
Indicates if the trawls are on bottom.

  • Fishing is greatly reduced once your trawls 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.

Clump Depth
Depth sensors indicate the distance from the surface to the middle weight (clump).

  • Ensures the clump remains on bottom.
  • Too little trawl wire out or towing too fast can bring the clump off 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 the sorting grid angle.

  • 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.

  • Keeping the optimal wing spread can be just as important as doorspread.
  • Wingspread is a critical piece of information for researchers in calculating swept area.
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