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This Daily Mail's news seems to be controversial in Hokkaido Prefecture.
I don't deny any possibilities about Fukushima Dai-ichi.

Thousands of tons of dead fish wash ashore in Japan - three months after the nation released treated Fukushima radioactive water into the sea

 
Unless there has been some significant undersea volcanic activity in the area the most likely cause would appear to be the contaminated water. Unfortunately corporate greed and government inertial will almost certainly ensure that none of the washed up dead fish are tested for contamination
 
The small volume of radioactive water from Fukushima that was dumped in to the ocean would dilute within a day, and become so not-dangerous that there is no way it is responsible for the fish dying off Hokkaido. In actuality, even if the fish swam through the radioactive water as it was being dumped into the ocean, it would be very unlikely that any number would die - quite likely none would die.

Also, the kind/level of radiation that would kill mass numbers of fish simultaneously would leave the fish obviously radioactive.
 
Disclaimer: I am not a marine biologist/zoologist :)

Sardines eat planktons.

Pacific Mackerel eat planktons and sardines (among a host of other things).

If the die off of large amounts of sardines and some mackerel is food chain related, then it would have to be something that affects the planktons. There are occasional events called toxic algae blooms, which are often a form of phytoplankton that are inimical to other life - particularly animals that eat the phytoplankton.

If it is not plankton related, then it would have to be some other environmental factor.

AIUI, usually in the past the mass die offs of sardines have been due to oxygen starvation, chemical toxins (natural or human in origin), or toxic algae(phytoplankton) blooms.

I would think that if the current mass of sardines had died from toxic algae(phytoplankton) blooms it would be immediately detectable in autopsy. Oxygen starvation or some form of chemical toxin might take some time to figure out - particularly depending on how decomposed the fish are.

Maybe?
 
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I'm not saying it has nothing to do with Fukushima, however, another option is a dead zone similar to the one off the coast of Louisiana. All the agricultural runoff from the Midwest in the Mississippi River (and probably petrochemicals as well) has created a massive dead zone in the Gulf of Mexico. The waters are simply O2 starved.

 
Latest news on the Hokkaido fish kill.

Fujioka Takashi of the Hakodate Fisheries Research Institute notes fish die-offs are not uncommon. He says the school of fish could have been chased ashore by predators such as dolphins and tuna, or it may have suddenly encountered frigid waters.

Fujioka emphasizes that it's unlikely seawater from Fukushima would ever reach Hakodate, which is more than 600 km away. He also points out that no abnormalities have been detected in sardines caught in the Hakodate area.

 
A dragon's phase appears on a 800 year old tree in a local shrine recently.
Local people are happy as the year of 2024 is a year of dragon in zodiac.

Dragon_of_Takaoka_Shrine.jpg

 

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