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Abstract. Skipjack tuna (Katsuwonus pelamis) has a wide distribution in the tropics, especially in eastern Indonesia. The types of fishing gear used consist of purse seines, pole and line, tuna longlines, hand lines and trolling lines. The purpose of this study was to determine the relationship between sea surface temperature (SST) and fishing time on the amount and size of tuna catches. This research is an associative study which aims to determine the relationship between the variable fishing time and SST on the amount of catch and size of K. pelamis. These relationships were analyzed using correlation and simple linear regression. The results showed that SST had an effect on the yield and size of the fish caught. The largest catch and the largest K. pelamis size were found at SST 28.0-29.90C and decreased with increasing temperature. Catching time affects the yield and size of the fish caught. The largest catch and the largest K. pelamis size were found in the time range 05.00-08.59 AM and decreased with advancing in time.
Key Words: pole and line, tuna (Thunnus sp.), oceanographic characteristics, fish size.
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Introduction. Indonesia plays an important role in the world's Tuna (Thunnus sp.), bullet tuna (Auxis rochei) and skipjack tuna (Katsuwonus pelamis) fisheries, which have supplied more than 16% of world production (Firdaus 2019). Thunnus sp. and K. pelamis rank third among marine resources that support global fisheries (Soukotta et al 2017).
Matsumoto et al (1984) in (Kiyofuji et al 2019) said that tuna and K. pelamis are highly migratory species with a wide geographical distribution from the equatorial zone to temperate areas. Anderson et al (2012) in (Waileruny et al 2014) explains that K. pelamis is present in all tropical oceans, has a large population size, relatively fast growth, and high reproductive potential. As a result, in general, the ability to withstand fishing pressure is relatively high and it is relatively difficult to over fishing and is considered to constantly change places.
The distribution area of Thunnus sp. and K. pelamis in Indonesia is mainly in the Eastern Indonesia region (Supriatna et al 2014). The results of the parameters of oceanographic characteristics indicate that West Papua waters have good marine resource potential for the survival of...