Fish Selector - sorting fish by size and specie

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Fish Selector

Fish sorting


The Fish Selector gives the following advantages:

  • The equipment is pre-programmed to automatically sort fish underwater by certain size and specie
  • Unwanted fish are automatically bypassed and swim away
  • No more discarding of fish
  • Counting of caught fish and bypassed fish
  • Helps skipper with decision making of selecting fishing area
  • Increased value of the catch



The Fish Selector helps sorting the fish while still in the trawl. The equipment is pre-programmed to select fish by specific size and specie.  The unwanted fish, either too small or not the right specie, are automatically sorted out and released through a door into the open ocean.  When Fish Selector is brought on the ship deck, collected information can be wirelessly retrieved on quantity of fish caught as well as quantity bypassed.  Other data can be collected such as depth, temperature and inclination. 

The aims of using Fish Selector is to increase the value of the catch, avoid discard of fish and increase fishing efficiency by helping with decision making for the skipper of selecting a fishing area. In addition to benefitting the commercial fisheries companies the marine research institutes may find scientific value in using the equipment in their studies. 

In the Fish Selector there are video cameras and computer equipment that scan the fish, measure the length and determine the species. The desired fish approved by the equipment goes straight into the cod end of the trawl.  Fish Selector is mounted in front of the cod end of the trawl. The Star-Oddi motor system and electronic container is powered by a battery pack that typically lasts 4 hours, depending on the activity of the bypass gate. Battery pack is rechargeable.


See a news video clip on the Fish Selector on YouTube.
Read an article about Fish Selector in the Feb. 2011 issue of Irish magazine The Skipper.

Technical Specifications

Size (dimensions) H x W x Lca. 120 cm x 120 cm x 200 cm
Weight (in air/in water)<300 kg
Base materialStainless steel (low corrosion)
Video camerasStereo video camera system
LightSelected light diodes at specific nm
Measured parametersFish length (accuracy better than +/-20 mm)

Specie recognition (device can be used to program ID of different specie, separation of cod and haddock has been programmed, other species need to be programmed. Species that are very much alike are more difficult to separate).

Inclination (pitch and roll)
Battery voltage
Battery container lifetime4 hours (depending on activity of bypass gate)
Battery is rechargeable
Operational depthDown to 600 m
PC communication to control unitSoftware for setup and data receiving, analysing and managing data
Tow speed0 to 4.5 NM/h (nautical miles per hour)
Communication with deviceWireless (optionally cable for communications and power)
OptionsSpare battery container (recommended)
Spare light tube (recommended)
Video and light module
Motor system for opening and closing gate, including positional sensors.

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