Japanese fishery data based on a quarterly calendar

The quarterly catch and weight at age of CM from 2010 to 2020 and quarterly maturity at age data from 2007 to 2020 are calculated and presented. The quarterly catch at age represents catch in Q4 and Q1 of the subsequent year is significant while catch in Q2 and Q3 is low. The catch of age 0 appears regularly in Q3 and Q4, representing the recruitment of age 0 fish to fishery appears after Q2. With the availability of Japanese catch at age data in quarterly basis and presence of age incrementation in the middle of the calendar year, it is advised to use fishing year to assess the stock of CM with rich temporal catch at age data.