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Ujung Serangga fishing port is one of fishing port located in a Fisheries Management Area of Republic Indonesia 572 (WPP572), located in Southwest Aceh. One of catch landed is longtail tuna caught by mini purse seine. Longtail tuna ( Thunnus tonggol ) is a species from the neritic tuna, where this species is often the target of catches in the coastal waters of Southwest Aceh [1,2]. This species has a high economic value in Southwest Aceh but also has a lack of data, both biological and catch production data. This research aims to assess the vulnerability status of longtail tuna in Fishing Port of Ujung Serangga. This research was conducted from December 2018 to February 2019. Analysis of longtail tuna using Productivity and Susceptibility Analysis (PSA) software. This analysis is one method that can be used to analyze the intensity of fish stocks using 22 attributes of productivity and susceptibility parameters. Longtail tuna has a productivity value at 2.30 and susceptibility value at 2.08. Vulnerability index of this species is 1.29. This value indicated that the stock status of longtail tuna landed in Southwest Aceh was low vulnerable or still in the good category.

Vulnerability status of longtail tuna (Thunnus tonggol) in Southwest Aceh waters, Indonesia