Spatiotemporal Abundance Distribution and Size Composition of Anchovy in Trat to Prachuap Khiri Khan Provinces
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Abstract
This study aimed to investigate the abundance, distribution and size composition of anchovy species Encrasicholina heteroloba and E. punctifer using data collected from anchovy purse seine and falling net fisheries at landing sites in Trat Province to Prachuap Khiri Khan Province from May 2021 to April 2022. The results showed that the abundance and distribution of both anchovy species were closely related to monsoon-driven water circulation. During the southwest monsoon season, high abundance and wide distribution were observed in the eastern Gulf of Thailand, particularly from Chonburi to Trat provinces, as well as in the western Gulf of Thailand near Prachuap Khiri Khan Province. In contrast, during the northeast monsoon season, anchovy abundance was concentrated in the inner Gulf of Thailand, especially in Phetchaburi and Chonburi provinces, as well as in the eastern and central Gulf of Thailand. During the transition from the northeast to the southwest monsoon, increased abundance and distribution were observed in the eastern Gulf of Thailand, particularly in Chanthaburi and Trat provinces. Chlorophyll-a concentration was related to anchovy abundance and distribution. No fishing activity was observed in areas with high chlorophyll-a levels, and low anchovy abundance was recorded in areas influenced by chlorophyll-a. In terms of size composition, juveniles of E. heteroloba were mainly distributed along the eastern Gulf of Thailand coastline, with high abundance during the southwest monsoon season (June–August). Lower proportions were observed during the northeast monsoon season and the transitional period. Juveniles of E. punctifer were found in very low numbers from April to June and were absent in September, with the highest juvenile abundance in February, corresponding to the transition between the northeast and southwest monsoon seasons.
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King Mongkut's Agricultural Journal
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