It has been three days and eight months since the debris flow occurred in Atami City, Shizuoka Prefecture in July last year.

As a result of the prefecture's investigation of the impact of spiny lobsters on fishing grounds off the coast of the port where a large amount of earth and sand flowed in, it was found that there were serious impacts such as the disappearance of large seaweeds that are habitats. rice field.

In the large-scale debris flow that occurred in Atami City last July, a large amount of earth and sand flowed down the river into Izusan Port, and there are concerns about the impact on offshore spiny lobster fishing.



At the request of fishermen, the prefecture commissioned local divers from October to November last year to conduct four diving surveys around the fishing grounds and compile a report.



According to this, large seaweeds, which are the habitat of spiny lobsters, were not confirmed at all at the six survey points, and "the debris flow has a serious impact on the fishing grounds."



Around the fishing grounds, a phenomenon called "rocky-shore denying", in which seaweeds decrease, has been progressing for some time, but it seems that the large seaweeds have completely disappeared because the seawater became turbid due to the sediment that flowed into the harbor. about it.



In fact, the catch is also affected, and according to the prefecture, the amount of spiny lobster landed during the three months from September to December last year was 355 kg, which is more than 20% compared to the same period of adulthood. It means that it has decreased.



The Shizuoka Prefectural Fisheries Promotion Division said, "The reason why seawater continues to be turbid is that, in addition to the initial large-scale inflow of sediment, the sediment from the restoration work that continues upstream of the river is flowing in. I would like to continue the investigation and see the impact over a long period of time. "