Mackerel (Scomberomorus spp.) is a dominant pelagic species landed at the Kuala Tungkal Coastal Fishing Port (PPP Kuala Tungkal). This study analyzes the variability of sea surface temperature (SST) and chlorophyll-a concentrations and their influence on mackerel catches during 2019-2023, as well as examines the relationship between ENSO and IOD climate phenomena with the variability of SST, ch…