Abstract
Skipjack tuna (Katsuwonus pelamis) is an important pelagic fish species caught in tropical and subtropical waters of the Pacific, Atlantic, and Indian oceans. Skipjack tuna (K. pelamis) is also a high economic fisheries resource in Prigi waters which is caught by troll line. High market demand results in high levels of exploitation. This study aimed to identify the length-weight relationship and biological reproduction of skipjack tuna in the Prigi waters. The research was conducted in the sampling period between December 2019 - April 2020 with total samples obtained as much as 1642 fish and was analyzed using linear regression. The results informed that the length-weight relationship of skipjack tuna was positive allometric with equation W=0.007FL3.223 which means that the fish has a fat body. The sex ratio between male and female fish is 1:1. While gonad maturity level obtained in this study is mostly in GML 1 and GML 2 which indicates that the catches were dominated by immature fish, so it is necessary to limit fishing effort so that sustainability of the skipjack tuna (K. pelamis) resource can be managed.
Highlights
Skipjack tuna (Katsuwonus pelamis) is an important commercial species with high productivity and mainly caught in tropical and subtropical waters of the Pacific, Atlantic, and Indian oceans
Some literatures and journals explain that the biological aspects such as length-weight relationship and the reproductive of skipjack tuna (K. pelamis) is very interesting to discuss because the skipjack tuna (K. pelamis) is considered as a robust species due to its high productivity and life history parameters [2]
From the results of the T-test measurement, the t-value is 8.890 and the t-table value is 1.961 which means that the t-count value is greater than the t-table where the value of b>3 which means that the growth pattern of skipjack tuna (K. pelamis) has a positive allometric pattern where growth weight is faster than growth length
Summary
Skipjack tuna (Katsuwonus pelamis) is an important commercial species with high productivity and mainly caught in tropical and subtropical waters of the Pacific, Atlantic, and Indian oceans. The information about biology will make easier for the fisheries officers to determine fish growth pattern, especially skipjack tuna (K. pelamis). Indian Ocean of the Indonesian Fisheries Management Area (FMA 573) has great tuna resources. Tuna fishing activities in FMA 573 are carried out using a variety of fishing gear such as longline, trolling line, and pole and line. The estimation of the utilization level of the maximum sustainable production potential of skipjack tuna (K. pelamis) in FMA 573 is a moderate status. The FMP is expected as a reference for the sustainable management of Indonesian tuna
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