The sampling rate is decided based on the variation of catches of each fishing gear. Random sampling is employed for selecting sample vessels in principle. However, when the owner of a vessel is not cooperative to the statistical survey, that vessel is not sampled. The list of vessel sampled in this way for each province is send to respective Provincial fisheries office.
The enumerator of the Provincial Fisheries Office visits owners of sampled fishing vessel monthly and fills the datasheet prepared by FSARG. When the enumerator is not able to obtain sufficient data by interview survey, he/she collects Fish Tickets (records of fish landing prapared by fish traders who buy fish from the owner, Fish brokers who intermediate fish trade between fisherman fish trader, or Fish Marketing Organization or Fishermen's Cooperatives who manages fish landing places) to obtain further information to fill the datasheet. In many cases, only records in Fish Tickets are available later.
(B) Marine fisheries statistics by landing place
FSARG has selected 37 major landing places along Thai coasts (Annex 2). Provincial enumerators collect data on amount and value by species landed at selected landing places one form the Fish Marketing Organization who controls fish trade at landing places and other landing places are selected from copy Fish Tickets. FSARG will use the statistic data of this survey for the cross-check with total marine production of Fisheries Statistic of Thailand. The coverage percentage of this method will be 14% of total landing.