Marport’s catch sensors tell you when your trawl starts to fill. Placed on the top of the trawl codend, they monitor the amount of catch that you have and warn you when the trawl is full. You can even use them to determine a precise amount of fish inside the trawl net. This way, you can monitor the contents of the codend as you are fishing, avoid problems of overfilling and increase fish survival rate inside the trawl net. It is recommended to install several sensors along the trawl to better follow the filling processes.
There are two types of catch sensors:
Catch Sensor: gives you the catch status of the trawl (empty or full), along with depth, water temperature and pitch and roll information. Catch sensors can emit on a single frequency of 40 kHz (Marport, Scanmar) or 70 kHz (Simrad, Wesmar), or on a dual frequency (40 kHz/70 kHz).
Catch Explorer: gives you the catch status of the trawl, with depth, water temperature and pitch and roll information. In addition, it provides an echogram image of the volume of catch inside the codend.
You can install several sensors on the codend to better follow the filling processes. It is very useful to determine the amount of fish inside the trawl net: you can prevent damage to fish and increase the security of crew and vessel.
For example, you can install three sensors on the codend. They will trigger one by one, according to the amount of fish inside the codend. After a few tows, you can estimate the amount of tonnage of fish that you have depending on whether one, two or three sensors display a full status.