Mass of whip ray found going upstream of river in Chiba

Mass of whip ray found going upstream of river in Chiba



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In the morning of 7/17/2012, a few hundreds of whip ray were found going upstream in Isumi river of Chiba.
The surface of river (About 3km from estuary) was covered by brown and black whip rays. They disappeared before noon.

The mass of whip ray came back to the same point in the morning of 7/18/2012 again.
People near the area comment it is not rare to see whip ray coming upstream. On the other hand, a fish handler of Kamogawa seaworld talked it’s 30~40cm big, which is adult. It comes upstream from Spring to Summer occasionally but it is rare that the mass of whip ray come upstream at once. The reason is not known.

Mr. Horie from Tokai university states, female whip ray lay eggs near estuary sometimes but they are 80cm ~ 100cm without a tail. The ones of 40cm is too small to come upstream, it is not for laying eggs. Even if it is for laying eggs, it can’t be such a mass.
Fishery’s union in Taito fishing port also comments whip rays are released even if they are caught in the net. It feels strange to see such a mass of whip ray coming upstream.

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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.


July 2012