Total Allowable Catch of Indonesian Southern Bluefin Tuna Thunnus maccoyii and Its Potential Resources in The Indian Ocean

Fathur Rochman,Gussasta Levi Arnenda,Maya Agustina

doi:10.1051/e3sconf/202014702013

Abstract

Southern Bluefin Tuna (SBT) is a high value species fished by many countries including Indonesia, and its fishing activities has been regulated by CCSBT. This study aimed to determine the potential resource of Indonesian SBT, utilization, and review of the Total Allowable Catch (TAC) of Indonesian SBT. This research was conducted from January 2017 to April 2018. The primary data used in this study were the otolith samples and the enumeration data of SBT landed in Benoa port from 2012-2017. Virtual Population Analysis (VPA) used in this research was based on a direct aging method using otolith. This research showed that the catch at age structure was distributed from 5-22 years with mean and mode of age were 9.63 and 9 years. The average of the exploitation rate measured was 0.191 per year meaning that the level of exploitation was categorized as underfished. The optimal assumption of the exploitation rate estimated in the range of 1,577 to 2,630 tons per year which is higher than the TAC provided by CCSBT. It was concluded that from 2015 onwards, the catch efforts were more effective and efficient with the increasing level of the exploitation and the decreasing number of efforts.

Highlights

Southern Bluefin Tuna (Thunnus maccoyii) (SBT: Southern Bluefin Tuna) is one of the tuna that has a higher economic value than the other tuna species
Southern Bluefin Tuna in the Indian Ocean evenly distributed from the east coast of Argentina to the east coast of New Zealand at the coordinate 30-50°S dan 70-190°E [2]
Reproductive cycle of SBT related to the movement of spawning stock biomass from the water around Tasmania (Australia) to Indonesian water from September to April each year [8]

Summary

Introduction

Southern Bluefin Tuna (Thunnus maccoyii) (SBT: Southern Bluefin Tuna) is one of the tuna that has a higher economic value than the other tuna species. Southern Bluefin Tuna is a highly migratory species where a part of its life cycle, especially in reproductive cycle, is carried out in Indonesia water in southeastern islands of Java, Bali and Nusa Tenggara to around Indonesian Exclusive Economic Zone (IEEZ) [6, 16, 5]. Reproductive cycle of SBT related to the movement of spawning stock biomass from the water around Tasmania (Australia) to Indonesian water from September to April each year [8].

Objectives

Methods

Findings

Discussion

Conclusion