On the 5th of June, 2023, Tepco announced they detected 18,000 Bq/Kg of radioactive cesium from Black rockfish collected in the port of the crippled nuclear plant of Fukushima.
This is 180 times much as the current food safety standard (100 Bq/Kg).
Moreover, the detected 18,000 Bq/Kg of radioactive cesium consists of Cs-134 and Cs-137.
The half-life of Cs-134 is up to 2 years, nevertheless this black rockfish contained 380 Bq/Kg of Cs-134. Tepco has not publicly made an announcement regarding the detection of Cs-134.
Source ; https://www.tepco.co.jp/decommission/data/analysis/pdf_csv/2023/2q/fish01_230605-j.pdf