Waves of dead fish arrive on the shores of Hakodate, in northern Japan. Hakodate authorities said in a statement that a large number of sardines had washed up on a city beach, adding that the cause of the mass fish die-off was not known.
According to a researcher from the Hakodate Research Institute in Hakodate, interviewed by an AP journalist, three hypotheses are being studied to explain this phenomenon. According to Takashi Fujioka, these sardines may have become exhausted while trying to escape other fish.
Second possibility mentioned by the specialist, the fish could also have suffered from a lack of oxygen linked to the movements of this immense group of animals. And finally, this immense school of sardines could have suddenly entered waters that were too cold, which would have resulted in the death of tens of thousands of fish.
The city asked residents not to collect or consume the fish. On the beach, municipal agents were mobilized to recover the bodies. The decomposition of fish could reduce oxygen levels in the water and have harmful consequences for the marine environment.