A study in Hokkaido, Japan found that the number of migrating salmon this autumn decreased by 24.5% year-on-year

Published Jul 1, 2024

Tridge summary

The article reports a significant decline in the salmon population in Hokkaido, Japan, with the number of fish returning expected to reach the lowest figure ever, at 14.1 million, a decrease of 2.26 million from the previous year. This decline is attributed to a poor return of three-year-old fish and concerns over a severe shortage of salmon hatching eggs in the Pacific coastal waters. The fall migration of salmon to Hokkaido saw a 35% decrease compared to the previous year, with the number of four-year-old fish dropping by the same percentage.

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Original content

This is the lowest forecast figure ever, down from 17.37 million in 2017, mainly because few three-year-old fish returned throughout the prefecture last year, meaning that the return of four-year-old fish, which is the main group, is not expected to be large. There are also concerns about a severe shortage of salmon hatching eggs in the Pacific coastal waters west and east of Erimo. The number of salmon that migrated to Hokkaido in the fall last year (coastal catch and inland river catch combined) was 22.57 million, down 35% from the previous year and far below the forecast of ...

Source: Foodmate