The dolphinfish (Coryphaena hippurus) is an economically important
species in eastern Taiwan. According to the 2000-2010 annual fishery
reports, the catch of dolphin fish off Taitung (eastern Taiwan)
represented almost 30% of the total catch from Taiwan waters. This
fishery usually operates with different setting characteristics which
alter the fishing depths of hooks. The objective of this project is
analyzing oceanographic variables affecting dolphinfish movement and
habitat depth off eastern Taiwan waters. Local dolphin fish longline
v e s s e l w a s c h a r t e r e d t o p e r f o r m e x p e r i m e n t a l l o n g l i n e s e t s .
Temperaturedepth recorders (TDRs) were attached to hooks in 4 different
positions
representing different fishing depths in longline baskets (i.e. basket =
number of hooks between floats). And CTD (Conductivity-Temperature-Depth)
logger deploy at longline cruise ending location. The results will
analysis the relationship between longline setting depth and fishing rate
for dolphinfish. Meanwhile, it can be demonstrated the oceanographic
variables affecting dolphinfish movement and habitat depth.