Prediction of Potential Fishing Zones for Skipjack Tuna During the Northwest Monsoon Using Remotely Sensed Satellite Data
Abstract: One of economically
important fish in the Bay of Bone is Skipjack tuna which their distribution and
migration are influenced by surrounding environment. This study aims to investigate the
relationship between skipjack tuna and their environments, and to predict
potential fishing zones (PFZs) for the fish in the Bone Bay-Flores Sea using
satellite-based oceanography and catch data. Generalized additive models (GAMs)
were used to assess the relationship. A generalized linear model(GLM)
constructed from GAMs was used for prediction. Monthly mean sea surface
temperature (SST) and chlorophyll-a during the northwest monsoon
(December-January) together with catch data were used for the year 2012-2013.
We used the GAMs to assess the effect of the environment variables on skipjack
tuna CPUE (catch per unit effort). The best GLM was selected to predict
skipjack tuna abundance. Results
indicated that the highest CPUEs (fish/trip) occurred in areas where SST and
chlorophyll-a ranged from 29.5°-31.5°C and 0.15 - 0.25 mg m-3, respectively.
The PFZs for skipjack were closely related to the spatial distribution of the
optimum oceanographic conditions and these mainly developed in three locations,
northern area of Bone Bay in December, in the middle area of the bay (4°-5.5°S
and 120.5°-121.5°E) during January and moved to the Flores Sea in February. The
movement of skipjack concentration was consistent with the fishery data. This suggests that the dynamics of the
optimum oceanographic signatures provided a good indicator for predicting
feeding grounds as hotspot areas for skipjack tuna in Bone Bay-Flores Sea
during northwest monsoon.
Keywords: skipjack tuna, potential fishing zones,
satellite based-oceanographic data, Northwest monsoon
Author: Mukti Zainuddin, Safruddin,
Muhammad Banda Selamat, Aisjah Farhum, Sarip Hidayat
Journal Code: jpperikanangg170028
