Modelling the Diel Vertical Movement of Swordfish (Xiphias gladius Linnaeus, 1758) Based on Temperature and Depth Recorder Data
Abstract: Understanding the
vertical distribution of large pelagic fish, swordfish in particular, could
improve our knowledge on its fisheries strategy, management and resource
conservation. However the methods often require expensive tools and resources,
which probably most scientists from the development countries couldn’t afford.
Thus developing model on the diel vertical movement behavior of swordfish using
number of hook between float (HBF) and complete-set temperature and depth
recorder (TDR) data could be an alternative. In general context, capture depth
distributions are a good indicator of the natural depth distribution of the
fish if the entire depth range of the species is targeted by longline gear. The
proposed sinusoidal model suggested that swordfish showed a diel pattern in
depth distribution, marked by remained in the surface and mixed layer waters at
night and dived into deeper waters during the day.
Author: Bram Setyadji, Hety
Hartaty
Journal Code: jpperikanangg160013
