|Abstract: ||Abstract: A lot of studies have been done on the fishing grounds shift and resources of surface and mid-layer
migratory fishes near Taiwan, but less were done on the bottom dwelling fish species. In this research, the
bottom dwelling lizardfishes commonly used for processed seafood products were studied to understand
the shift of its resources during the 15 year period between 1997 and 2011, under the climate change
index and environment factors of its habitat.
Results show Saurida undosquamis is the main lizardfish species caught in the south-western waters
of Taiwan. Comparing water temperature, fishing season, spawning peak, landing, CPUE, feeding habits
and geographic information, we found it moves to the warmer shallow waters after spawning peak during
Jan.- Mar., and return after September. Climate change index, SOI, PDO, MEI, temperature and salinity
factor at depth are relevant to the shift in its resources, but not sea surface temperature, salinity and river
drainage. Judging from the variation of these climate change factors, the occurrence of La Niña raises the
CPUE of lizardfishes, with a positive correlation with temperature change and a negative correlation with
salinity respectively at the depth of 100 m. These facts suggest that the strong northeast monsoon that La
Niña brings is conducive to the vertical mixing of different water layers. Furthermore, water from the South
China Sea, carrying more nutrient than the Kuroshio Current, flows through the Penghu Channel also
contributes to the increase in lizardfishes resources. Sudden changes in the hydrological environment
such as typhoons, may result in the increase of lizardfishes resources as well.
This research will help to predict changes in the lizardfish resources under the influence of
hydrological environment changes which provide an important reference for making responsive strategies
in the future.