Clams on the Ariake Sea die on average 20% Did heavy salt rain cause salt concentration drop? 17:29, July 17, Fukuoka
It was found that a certain number of special clams died in the Ariake Sea in Fukuoka Prefecture, and experts pointed out that one of the causes was that a large amount of fresh water flowed into the sea due to record heavy rain and the concentration of salt decreased. doing.
The Ariake Sea is one of the leading clam-producing regions in Japan, and it is a representative seafood along with the special seaweed.
Following the record heavy rainfall, the Prefectural Fisheries and Marine Technology Center and the federation of local fisheries cooperatives conducted an urgent survey earlier this week at four locations in the Ariake Sea, Yanagawa and Omuta.
As a result, it was confirmed that about 20% of the clams taken in the survey were dead on average, and it seems that it has died within the past 10 days from the state.
After heavy rains on the coast of the Ariake Sea on 6th of this month, the salinity concentration dropped sharply to less than one-fifth of the average value and remains low.
According to the center etc., clams will weaken and die if the low salt concentration continues, so a large amount of fresh water has flowed into the sea due to record heavy rain and intermittent rain after that, and the salt concentration has decreased. I point out that this is one of the causes.
Jiro Sano, Resource Division Manager, Ariake Sea Research Center, Fukuoka Prefectural Fisheries and Ocean Technology Center said, "I am worried that the river flow is still high and the salt content is still low. I will conduct another survey and confirm that the damage has not spread. I will do it."