The Nakauonuma Fisheries Cooperative (Toru Murayama, chairman) aims to reduce labor and ensure safety by releasing juvenile aromatic fish through the use of drones before the start of the aromatic fishing season (the third Saturday in July.) On May 24, 140,000 juvenile ayu were released at 21 sites, including the Kiyotsu, Nakatsu and Kama rivers.
Juvenile aromatic fish of more than 3 centimeters were placed in 16-liter containers of large drones that can be sprayed with insecticide and flown one after another to recipients waiting in the river. Murayama, head of the union, drew attention as a pioneering example, saying, “Isn’t this the first time that 26 fishermen’s cooperatives in the prefecture have used drones to release juvenile fish?”
Until now, juvenile fragrant fish were released into the rivers by bucket teams with the cooperation of union directors. However, due to the aging population and the typhoon disaster that occurred four years ago, the river environment has changed, making it difficult to access the riverbed and try out drone releases. There are many benefits, such as improved efficiency, and from this year we decided to release all the juvenile fish by drone.
Murayama, the head of the association, said, “In the bucket brigade, juvenile fish are inevitably damaged during transport, but with drones, the juvenile fish spend less time rubbing against the container, and the benefit is that they can be released while they are still alive.” It’s still healthy, the number of participants so far is about 10 people, about 4 people can do it, and we will continue to release drones. The use of drones has made the fry release sites more dispersed than before, and the plan is to investigate whether there is any impact on the growth conditions of the aromatic fish.