COST-EFFECTIVE APPROACH TO ESTIMATE UNREPORTED DATA: REBUILDING HISTORY OF LIFT-NET FISHING IN KWANDANG WATERS

Andhika Prima Prasetyo (Research Centre for Fisheries Management and Conservation, Jakarta)
Duto Nugroho (Research Centre for Fisheries Management and Conservation, Jakarta)
Lilis Sadiyah (Research Centre for Fisheries Management and Conservation, Jakarta)
Rudy Masuswo Purwoko (Research Centre for Fisheries Management and Conservation, Jakarta)
Ria Faizah (Research Centre for Fisheries Management and Conservation, Jakarta)
Agus Setyawan (Research Centre for Fisheries Management and Conservation, Jakarta)

Indonesian Fisheries Research Journal
Vol 20, No 2 (2014): (December 2014)

This paper aims to develop cost-effective approach regarding the estimation unreported annual catch data of lift-net fishery using Google Earth imagery. Lift net fishery is one of the main fishing activities of coastal community in Kwandang Bay, it has been faced problem of uncertain fisheries status due to limited recorded data. Combination of a Monte Carlo procedure was applied by involving couple of assumptions on parameters such as estimate growth rate of the total number of lift-net per years (10%), day at sea per unit per month (21 days) and operated lift-net per month (50% and 80%). The results showed that 101 units of lift-nets were found around Kwandang waters based on Google Earth imagery recorded in October, 7th 2010, and this were used as a benchmark of calculation. This prediction was 28 units higher than official data from North Gorontalo District of Marine Affairs and Fisheries Services (DKP Gorontalo Utara). Compared with capture fisheries statistics issued by Kwandang CFP, the estimated lift-net catches based on two-scenarios represent additional catches of 46 % and 86 %. These results suggested and could be used as a correction index to improve the reliability of Kwandang District officially reported fisheries statistics as a baseline to develop a local common fisheries policy.