Abstract
Fishing season is important in term of understanding the catch dynamics however, by far the analysis never considered environmental variables into the calculation. The environmental variables in this case is addressed to sea-air interactions during 2012-2015, i.e. monthly wind, surface wind wave, and precipitation level. This study aimed the alternative, yet breakthrough on using Generalized Linear Model (GLM) to analyse the fishing season of skipjack tuna caught by small-scale hand line fleet. The result showed that GLM can be a good alternative in term of predicting the fishing season of skipjack tuna. It provided a good understanding with the surrounded environmental variables. Skipjack tuna fishing season starts from March, reach its peak in April and October. The low season is Februari, June and September. Local weather (wind speed) and religious affair (FastIed) significantly affected the fishing behavior thus lead to dynamics of CPUE obtained.Keywords: sea-air; fishing season; hand line; skipjack; Pacitan coastal waters; south eastern Indian Ocean; CPUE, GLM, small-scale
Highlights
Skipjack tuna (Katsuwonus pelamis) has become the target species for small-scale fisheries for decades (Fonteneau et al, 2013)
In the last 30 years the catch of skipjack in Indian Ocean has increased substantially, which largely been driven by the arrival of purse seiners and Fish Aggregating Device (FADs) in the 1980s (IOTC, 2016; Dueri et al, 2012)
The catches of skipjack tuna from Indonesian fleets were accounted for 21% from total catch in Indian Ocean (IOTC, 2016)
Summary
Skipjack tuna (Katsuwonus pelamis) has become the target species for small-scale fisheries for decades (Fonteneau et al, 2013). It mostly exploited by coastal countries along the Indian and Pacific Ocean. In the last 30 years the catch of skipjack in Indian Ocean has increased substantially, which largely been driven by the arrival of purse seiners and Fish Aggregating Device (FADs) in the 1980s (IOTC, 2016; Dueri et al, 2012). The average catch from 2011-2015 estimated to be around 81,733 metric ton It mainly contributed by coastal purse seine, hand line and pole and line fisheries. The catch should be close-monitored as a precautionary approach, even though skipjack tuna is considered to have a high resilience against overfishing due to their fast growth rate and their year-round spawning (Dueri et al, 2012)
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