The yield of wild salmon in Japan has plummeted by 70%, with deteriorating water quality causing massive deaths.

This crisis has been triggered by a "double blow": a sharp decline in the number of returning fish and the large-scale death of wild salmon. Experts point out that rising sea temperatures and red tide phenomena, which have led to deteriorating water quality, are the main causes. Red tides have frequently occurred along the Pacific coast in recent years, not only causing the death of wild salmon and sea urchins but also being closely related to the reduction of sea ice in the Okhotsk Sea and the continuous rise in sea temperatures. The shortage of resources is severely impacting artificial breeding plans. The number of parent fish used for artificial insemination in the Abashiri River basin has significantly decreased, making it difficult to advance the collection of fertilized eggs, which threatens the recovery of the overall wild salmon resources in Hokkaido. Industry insiders are concerned that if the number of breeding fish cannot be guaranteed, the number of returning fish ...