Sweetfish to spawn significantly decreased in two major rivers of Kanto area

According to Japan Water Agency Tone river, the number of sweetfish to swim up Tone river and Arakawa river significantly decreased in 2013. Tone river has the largest basin in Japan. Arakawa is also a class A river to run through Saitama and Tokyo. The estuary is in Tokyo bay.

From 4/21 to 5/31/2013, they counted the number of sweetfish to swim up Tone river near the border of Saitama and Gunma prefecture.

As a result, it was 17,282, where it was 101,471 in 2012 (-87%).

In 2011, it was 141, 392.


In Arakawa river, they also counted sweetfish from 4/1 to 5/17/2013. The result showed the number decreased from 898,502 of 2012 to 441,279 of 2013.

The fishery cooperative of Saitama prefecture commented the swimming up sweetfish suddenly became small this year.

The reason is not verified.


Related article..Japanese pond smelt gone nearly extinct in Haruna lake Gunma, can’t even find a sample for radiation test [URL]

Strong alkaline detected from river where 11,000 young sweetfish found dead [URL 2]

Eggs of sweetfish decreased by 98% in Biwa lake, Prefectural gov “Unusual condition” [URL 3]







Whatever TV says, 1 + 1 = 2.


Français :

Le nombre d’ayus allant frayer à grandement diminué dans deux grands fleuves de la région de Kanto


Selon l’Agence de l’Eau du Japon pour le fleuve Tone, le nombre d’ayus (Plecoglossus altivelis) remontant les fleuves Tone et Arakawa a grandement diminué en 2013. Le fleuve Tone a le plus grand des bassins au Japon. L’Arakawa est aussi un fleuve de classe A qui traverse Saitama et Tokyo. Son estuaire est dans la baie de Tokyo.

Entre le 21 avril et le 31 mai 2013, ils ont compté le nombre d’ayus remontant le Tone près de la frontière entre les préfectures de Saitama et de Gunma.
Au final, il est de 17 282, alors qu’il était de 101 471 en 2012 (-87%).
En 2011, ils étaient 141 392.

Dans le fleuve Arakawa, ils ont aussi compté les ayus entre le 1er avril et le 17 mai 2013. Les résultats montrent que leur nombre est passé de 898 502 pour 2012 à 441 279 pour 2013.
La coopérative des pêches de la préfecture de Saitama déclare que le  nombre d’ayus a chuté brutalement cette année.
La raison n’en est pas trouvée.

Articles liés :
* L’éperlan d’eau douce japonais est pratiquement éteint dans le lac Haruna de Gunma, pas un seul même pour test de radioactivité
* Des alcalins puissants dans le fleuve aux 10 000 ayus morts
* Les pontes de ayu ont chuté de 98% dans le lac Biwa. La préfecture : “conditions inhabituelles”


Quoi que dise la télé, 1 + 1 = 2.

About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.


June 2013