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Cycle 6 (2017 Deadline)

Delineating stock structure for tuna fish within Sulu Sulawesi Regions

PI: Ida Astarini,, Universitas Udayana and BIONESIA
U.S. Partners: Allen Collins, National Marine Fisheries Service of the National Oceanic and Atmospheric Administration (NOAA) Fisheries Service, and Bruce Collette, The Smithsonian Institution
Project Dates: December 2017 - November 2020

Project Overview

Sulu Sulawesi is a highly diverse marine region located in the heart of the Coral Triangle. The diversity of marine species and habitats in this region continue to be threatened by human activities, including overfishing and destructive fishing practices. Escalating threats to the coral reef ecosystem of the Sulu Sulawesi seascape have motivated the establishment of the Sulu Sulawesi Marine Eco-region (SSME), an international partnership launched in 1999 by the governments of Indonesia, Malaysia, and the Philippines. The SSME emphasizes the promotion of sustainable fisheries within the region by gathering baseline information on growth rate, migration, and stock structure of highly consumed species such as longtail tuna (Thunnus tonggol). Stock structure in commercial fisheries is typically assessed using genetic approaches, allowing managers to understand population mixture and recognize migration patterns between regions. Using this genetic data, we can also identify effective population size—an essential parameter that helps determine the vulnerability of populations, thereby informing sustainable management and conservation decisions dealing with exploited species. Although powerful, defining stock structure in SSME regions is challenging and requires expertise in conservation genetic skills that are rarely available in this region. Many labs are not equipped with the tools or training required to support this type of research. At this time, research capacity has been developed sporadically and is not specifically designed to support conservation and policy. Using insufficient data to develop fisheries management and conservation strategies could lead to ineffective conservation efforts that put critical fisheries resources in jeopardy.

6-446 Kedonganan Sampling6-446 Student Lab Work
Members of the research team collect fish samples at the Kedonganan Fish Market in Jimbaran (photos courtesy of Dr. Astarini).Students from Trunojoyo and Udayana Universities in the lab.

This project will provide essential scientific information to support policy design and ensure that sustainable fisheries practices are effective within SSME regions. The first major activity is understanding stock structures of longtail tuna within the Sulu-Sulawesi Sea, and to this end the team will collect 30-50 samples per population/location at sites off Indonesia, the Philippines, and Malaysia. The samples will undergo 2b-RAD analysis at the Smithsonian Institution, to be carried out by visiting research team members on three-month internships with guidance provided by the U.S. partners. Back in Indonesia, the team will organize several training and outreach activities, including a molecular genetic and biodiversity workshop and a next-generation DNA sequencing workshop to train students and faculty from partner universities in the theory and application of modern molecular genetic research for the study of fisheries, marine biodiversity, and conservation. Near the end of the project, the PI and her team will also host a national seminar on sustainable fisheries of tuna and other commercial species to discuss the study’s findings. The event will also provide a platform for stakeholders, including academic researchers, NGO representatives, and government and industry staff, to share their ideas on emerging fisheries issues and discuss how research can be applied to effective sustainable fisheries management strategies.

Summary of Recent Activities

From the project’s start date in December 2017 through mid-April 2018, the PI and her team conducted several meeting and events to launch their activities. In an effort to identify potential collaborators, they met with representatives of Loka Tuna Fisheries Research in Denpasar, Bali; Dr. Khairul Adha, University of Malaysia Sarawak; and (via teleconference) Dr. Ma. Carmen Ablan-Lagman, De La Salle University, the Philippines. The team also attended the Shark and Rays Symposium in Jakarta, March 27-29, 2018, organized by the World Wildlife Fund and the Indonesian Ministry of Marine Affairs and Fisheries. This event presented a useful opportunity to introduce the new research project on longtail tuna to scientists and officials from other NGOs and government institutions. During this same reporting period, BIONESIA and Universitas Udayana also hosted one-month internships by several students from the Marine Science Department, Faculty of Agriculture, Trunojoyo University. In addition, the team received research visits from students from two other universities in Bali, Universitas Pendidikan Ganesha – Singaraja and IKIP PGRI – Bali. To further their outreach efforts, team members also presented a general lecture on the project to students and faculty at Universitas Udayana on April 9, 2018.

After receiving valuable input from their counterparts in Malaysia and the Philippines on preliminary sampling strategies, the team has collected several samples from Bali and North Maluku. They will use the samples to identify morphological characteristics of the individuals collected and compare them with genetic data for longtail tuna. These preliminary data will be used as the key for sampling the correct species of longtail tuna within the planned study area. Sample collection will continue throughout Indonesia in the coming months. The team also aims to announce details on their mini grant program planned as part of the PEER project.

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