dockin net with crane
catch with air bubbles
What it does
Glaucus an autonomous net, manages fish stocks sustainable and controlled by the connection with a monitoring system. An overfishing is avoided. A special selection ensures that in the future more fish can swim in the sea.
By large mesh openings of conventional trawls big amounts of bycatch and unwanted fish size reach on the ship, which are usually thrown dead overboard. The selection is a challenge. Inaccurate information of bycatch and catch quota complicate the calculation to make precise catch quotas. This brings the fish stocks further at risk. It raises the question: How much fish can be caught and how much fish is still in the sea? A genetic modification (Fisheries-Induced Evolution) is caused by the fishing out of large individuals. The fish got smaller and produced less spawn. However, fish consumption is rising!
How it works
The concept Glaucus shows how a sustainable and controlled management of resources with pelagic-autonomous trawls are possible and overfishing can be avoided. Connected with an Underwater Fish Observatory, what is currently in development, will monitor the status quo by mutual data exchange. Glaucus, which is equipped with the latest sonar and sensor technology, is left in fishing area into the water and searches autonomic for fish. It encircles a school of fish with air bubbles, counts them and determines fish species and sizes by their silhouettes. At high bycatch, the process will be cancelled and the fish will set free. The 3-zone-selection sorts different size of fishes by sorting grids with variable mesh sizes. By the sorting grids, large individuals can not enter the net body, otherwise they will be freed separately through an aperture at the Selection Rings. The "Fisheries-Induced Evolution" should thus be counteracted.
From my research, I concluded that it would be a big improvement for the Fishery, if the commercial fishing nets were more selective and fish stocks would be monitored, which attaches already during the removal of the sea. The idea of variable mesh sizes arosed, which decides on the selection of the various fish species and sizes. I developed concepts and created mock-ups which led ultimately to the idea of a 3-zone selection. The fish (herring) was the focal point in the design process and the net was designed starting from the behavior of this fish. It raised the question: How a swarm can be captured in spite of a small net dimension that has been achieved by the inclusion of air bubbles along the lines of "Bubble Net Feedings" of whales ? An essential point was to find a suitable a point of intersection in order to transport the fish. Also, in order to design a flowing process, which keep the connection in between and end with discharging the caught fish. The technical orientation of diving robots as AUV's and the project "UFO", an underwater fish observatory, showed me that my project is feasible. My questions were answered by marine biologists, a fisherman and technicians.
How it is different
By connection with a monitoring system and the exchange of data, with Glaucus can be fished sustainably and controlled for the first time. Here, the status quo of stocks is considered and overfishing is avoided. Another innovative feature is the 3-Zone Selection of different fish sizes by variable mesh widths of the sorting grid and the peculiarity that big fish are carefully sorted out from the net and thereby the problem of "Fisheries-Induced Evolution" will counteract, so that more fish swims in the future in the sea. Specifically, is the vertical alignment of the net during the process of fishing where fishes are held back by air bubbles to the surface into position. After that, the catch will analyze the number, type and size and test it, before they can pass into the trawl body. At hight bycatch, the process will be aborted and the fish will be released. Through the independent drive of the net, expensive and polluting fuel is saved.
First and foremost I would like to see my project makes clear that a sustainable and controlled fishing by a symbiotic cultivation with Glaucus and a monitoring system is feasible with our technical capabilities. The next step would be a direct collaboration with an institution where biologists and technicians work on the implementation of the project. Also,the search for investors who can realize the construction of prototypes and testing. Furthermore, other fishing methods should be reconsidered and get interconnected with the monitoring system.With the new fishing method,Fishermen and scientists would cooperate and get closer to each other