This paper analyses catch and effort in the data deficient commercial offshore fisheries of Myanmar's Tanintharyi Region, using a unique dataset of fish catch landing records.

We analyse 26,517 logbook records for five gear types-fish and crab traps, squid and purse seines, and demersal trawls-collected by the Department of Fisheries (DOF) between June 2009 and April 2018. This analysis allows us to assess the impact of evolving management measures introduced during this period to control total effort and fishing activity. Catch per unit effort fell by between − 27% and − 64% across the five gear types over this period.

2021 Catch and effort trends in Myeik