Fishing and Gear Technology

Unit 16 - Electronic equipments for fishing

16.10.Net Monitoring System/Trawl eye

The net sounder is an aid for trawl fishing.The knowledge on the position and state of the trawl can contribute to a successful fishing.This requires necessary sensors/transducers to be located on the net and the indicator or receiver installed on board the ship along with a linking medium, either by cable or radio.The transducers give inputs regarding trawl opening both horizontal and vertical, vertical depth from trawl to sea bed and sea surface, water temperature, catch details etc. Other uses of the system are as follows

• Detects when the bottom trawl touches or lift off the sea bed
• Detect the amount of fish caught in the cod end
• Measures the depth from sea surface to the sensors
• Measures the height from the sensor to the sea bed
• Can detect if the gear is torn or damaged
• Measures the distance between the doors
• Measures the water temperature at the gear