Longtail tuna, Thunnus tonggol (Bleeker, 1851): a global review of population dynamics, ecology, fisheries, and considerations for future conservation and management

Griffiths, Shane P.; Leadbitter, Duncan; Willette, Demian A.; Kaymaram, Farhad; Moazzam, M.

doi:10.1007/s11160-019-09589-5

Cited by 10 publications

(4 citation statements)

References 62 publications

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“…The LC value varies at each research location; differences in fishing gear and fishing methods can cause differences in LC values. This affects the fish size data obtained and the analysis size results' (Griffiths et al 2020). Other factors that influence the size of the LC values are net mesh size, differences in seasons, and differences in fishing areas (Hidayat et al 2020).…”

Section: Discussionmentioning

confidence: 99%

Biological parameters and spawning potential ratio of Longtail Tuna Thunnus tonggol landed in Kranji fishing port, Lamongan District, Indonesia

HARLYAN,

RAHMAN,

RIHMI

et al. 2023

Biodiversitas

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Abstract. Harlyan LI, Rahman MA, Rihmi MK, Abdillah SFA. 2023. Biological parameters and spawning potential ratio of Longtail Tuna Thunnus tonggol landed in Kranji fishing port, Lamongan District, Indonesia. Biodiversitas 24: 6527-6535. Longtail Tuna (Thunnus tonggol), one of the small-pelagic tropical fisheries in the Fisheries Management Area (FMA-712), is important in supporting global food security. Therefore, to ensure its sustainability, this fishery is applying for fishery certification to be an ecolabel fishery by the Marine Stewardship Council (MSC). However, limited information about Longtail Tuna's biological parameters and stock status in this management area will lead to failure in certification completion. This study aims to provide biological parameters and stock status of Longtail Tuna landed in the Kranji fishing port, Lamongan, Indonesia. Length, weight, and gonad weight of female Longtail Tuna individuals which landed in the Kranji fishing port were conducted from January to April 2023. Several analyses were carried out to figure out the biological parameters of Longtail Tuna, such as length-weight relationship, length at first maturity ( ) and length at first capture ( ) estimation. Length-Based Spawning Potential Ratio (LB-SPR) analysis was conducted to estimate fish exploitation. Results showed that the Longtail Tuna landing in the Kranji fishing port exhibited a negative allometric growth pattern with the length-weight relationship model W = 0.0433 FL2.7608. A comparison between (43.9+0.11cm) and (43.6+0.04cm) indicated that most female Longtail Tuna landed in the Kranji fishing port are mature (60% of the total samples). The LB-SPR analysis showed moderate exploitation status (SPR = 34%). Fishing activities are still manageable in this situation by focusing on stock sustainability. An overlapping fishing ground occurs in the Kranji water, showing the domination of two species landed in the Kranji fishing port, Longtail Tuna and Eastern Little Tuna (Euthynnus affinis). Therefore, Longtail Tuna fishery management might also consider fishery management of Eastern Little Tuna or other species with overlapped habitats.

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Section: Discussionmentioning

confidence: 99%

Biological parameters and spawning potential ratio of Longtail Tuna Thunnus tonggol landed in Kranji fishing port, Lamongan District, Indonesia

HARLYAN,

RAHMAN,

RIHMI

et al. 2023

Biodiversitas

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“…A recent review (Griffiths et al 2020) posited four putative stocks across the entire range of longtail tuna: Western Indian, Northern Indian, Oceania and Southeast Asia. The hypothesis of a single southeastern Asia stock is based on prior studies by Willette et al (2016) and Malik et al (2020) that detected no genetic structure in longtail tuna populations in the South China Sea and the Java Sea.…”

Section: Discussionmentioning

confidence: 99%

“…Although longtail tuna are known to be neritic and not to undergo high levels of migration, this species has a wide distribution with little known population differentiation other than that between populations in the South China Sea and Indian waters (Kunal et al 2014). Islands and the general complexity of Indonesia's marine ecosystem may help explain differentiation flow through current between Southeast Asian waters and northern Australia (Lee et al 2002), which were made separate stock populations between those locations (Griffiths et al 2020). Moreover, morphometric, meristic, and electrophoretic observations of longtail tuna (Abdulhaleem 1989) have also indicated that there are two distinct populations between Indian and Pacific.…”

Section: Discussionmentioning

confidence: 99%

Genetic variation of longtail tuna Thunnus tonggol landed in four fish markets in Indonesia based on mitochondrial DNA

Astarini

Ningsih²,

Simanungkalit

et al. 2021

Biodiversitas

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Abstract. Astarini IA, Ningsih EY, Simanungkalit D, Ardiana SA, Al Malik MD, Yusmalinda NLA, Sembiring A, Pertiwi NPD, Cahyani NKD, Collins A. 2021. Genetic variation of longtail tuna Thunnus tonggol landed in four fish markets in Indonesia based on mitochondrial DNA. Biodiversitas 22: 1644-1651. Longtail tuna (Thunnus tonggol, Family: Scombridae) is an economically valuable neritic species found in tropical and subtropical waters in the Indo-Pacific region. High catch numbers, which have been decreasing, could negatively impact this tuna’s population level. Little research has been conducted on the longtail tuna population in Indonesia. This study aims to determine the genetic diversity and potential population structure of longtail tuna landed in four fish markets in Indonesia (representing three sampling locations because two markets are relatively close to each other) based on sequences of a region of mitochondrial control region (d-loop). A total of 101 samples, out of 110, were identified and confirmed as T. tonggol species by amplifying and sequencing a fragment of d-loop (amplicons ranging from 482 - 523 bp). Neighbor-joining analysis resulted in a topology with all samples grouped into one clade with an average genetic distance of 0.020. Meanwhile, haplotype diversity (Hd) and nucleotide diversity (?) values of the longtail tuna samples were 0.9939 and 0.0192, respectively. The fixation index (Fst) value was -0.00507, with p> 0.05, which indicates that there is no significant population structure among the longtail tuna collected from four fish markets representing three sampling locations. The results of this analysis can be used as basic data in planning sustainable fisheries management efforts.

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“…Di Indonesia, spesies ini dapat ditemukan di sekitar perairan Aceh, Jawa-Bali, dan Kepulauan Riau (Rahmah et al, 2019;Ardiana et al 2021;Astarini et al, 2021). Secara global, diperkirakan ada empat stok T. tonggol yang tren populasinya terus menurun yaitu di bagian Barat Samudra Hindia, Utara Samudra Hindia, Asia Tenggara, dan Oseania (Griffiths et al, 2020). T. tonggol di perairan Indonesia diduga hanya terdiri dari satu stok (Astarini et al, 2021) dan kondisinya saat ini terindikasi dalam keadaan over exploted sampai fully exploited (Fitriani et al, 2020;Hidayat et al, 2020).…”

Section: Status Konservasi Dari Ikan Yang Diperdagangkan DI Evaluasi ...unclassified

Status Konservasi dan Keanekaragaman Jenis Ikan yang Diperdagangkan di Pasar Ikan Tradisional di Bali

2022

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The high demand for fish for local consumption and export has led to overfishing and increased the trade of fish that are prohibited by law and international agreements. Therefore, this study aims to calculate species diversity and determine the conservation status of fish traded in traditional fish markets in Bali. Field sampling was carried out at fish markets located in Badung, Buleleng, Karangasem, and Jembrana. Samples are identified to the lowest taxa level that can be determined, based on morphological characters. Diversity parameters such as the Shannon diversity index (H), Simpson (Simp), Fisher Alpha, Species richness (S) and Pielou's evenness (J) were calculated using the Rstudio while the determination of conservation status refers to the IUCN Red List. The number of fish samples collected was 69 individuals from 23 families. Of the total 69 individuals, 61 individuals were successfully identified to species level, while the rest of it were identified to the genus level. The results showed that the family of Labridae/wrasses has the highest number of species (9 species) followed by Clupeidae and Scombridae (7 species each). The result of diversity indices showed that the Kedonganan fish market (Badung) has the highest diversity. Evaluation of the conservation status of traded fish showed that 80% of the traded fish species are still in LC (Least Concern) status, although one species identified as bigeye tuna, Thunnus obesus, is known to have VU (Vulnerable) status. Tingginya permintaan ikan untuk konsumsi lokal maupun ekspor menyebabkan terjadinya overfishing dan meningkatkan perdagangan ikan-ikan yang dilarang oleh undang-undang maupun kesepakatan internasional. Oleh sebab itu, penelitian ini bertujuan untuk menghitung keanekaragaman jenis dan menentukan status konservasi ikan yang diperdagangkan di pasar ikan tradisional di Bali. Pengambilan sampel dilakukan di pasar ikan yang terletak di kabupaten Badung, Buleleng, Karangasem, dan Jembrana. Sampel diidentifikasi sampai pada level taksa terendah yang bisa ditentukan, berdasarkan pada karakter morfologi. Parameter keanekaragaman seperti indeks keanekaragaman Shannon (H), Simpson (Simp), Fisher Alpha, Species richness (S) dan Pielou’s evenness (J) dihitung dengan Rstudio sedangkan penentuan status konservasi mengacu pada IUCN RedList. Jumlah sampel ikan yang dikumpulkan sebanyak 69 individu dari 23 famili. Dari total 69 individu, 61 individu berhasil diidentifikasi sampai pada level spesies sedangkan sisanya sampai level genus. Hasil penelitian menunjukkan bahwa Famili Labridae/wrasses memiliki jumlah spesies terbanyak (9 spesies) disusul oleh Clupeidae dan Scombridae (masing-masing 7 spesies). Hasil analisis keanekaragaman menunjukkan bahwa pasar ikan Kedonganan (Badung) memiliki keanekaragaman tertinggi. Evaluasi terhadap status konservasi ikan yang diperdagangkan menunjukkan bahwa 80% jenis ikan yang diperdagangkan masih dalam status LC (Least Concern) meskipun ditemukan juga satu spesies yaitu tuna mata besar, Thunnus obesus yang diketahui dalam status VU (Vulnerable).

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Longtail tuna, Thunnus tonggol (Bleeker, 1851): a global review of population dynamics, ecology, fisheries, and considerations for future conservation and management

Cited by 10 publications

References 62 publications

Biological parameters and spawning potential ratio of Longtail Tuna Thunnus tonggol landed in Kranji fishing port, Lamongan District, Indonesia

Biological parameters and spawning potential ratio of Longtail Tuna Thunnus tonggol landed in Kranji fishing port, Lamongan District, Indonesia

Genetic variation of longtail tuna Thunnus tonggol landed in four fish markets in Indonesia based on mitochondrial DNA

Status Konservasi dan Keanekaragaman Jenis Ikan yang Diperdagangkan di Pasar Ikan Tradisional di Bali

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