Dynamics of Gears, Fleets, Catch and Fishing Season of Smallscale Tuna Fisheries in Labuhan Lombok, West Nusa Tenggara

Setyadji, Bram; Nugraha, Budi

doi:10.15578/ifrj.21.2.2015.99-107

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…This province contributes significantly to the national production of tuna, with yellowfin tuna, T. albacares, the most abundant species landed, comprising~70% of the total catch [18]. Despite the significance of tuna in this province, few studies related to tuna fisheries have been made in this region [19]. We utilize the 'Ifish database' of the Data Management Committee, West Nusa Tenggara from 2012 to 2017, to investigate how CPUE of large tuna varies among different temporal factors, such as year, month of the year, different fishing days, and boat lengths, as well as the use of fish aggregation devices.…”

Section: Introductionmentioning

confidence: 99%

Catch per Unit Effort Dynamic of Yellowfin Tuna Related to Sea Surface Temperature and Chlorophyll in Southern Indonesia

Wiryawan

Loneragan

Mardhiah

et al. 2020

Fishes

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Tuna fisheries are the most valuable fisheries in the world, with an estimated market value of at least US$42 billion in 2018. Indonesia plays an important role in the global tuna fisheries and has committed to improve its fisheries management; therefore, a pilot of long-term spatial-temporal data bases was developed in 2012, however none have utilized data to have better understanding for management improvement. In this study, the annual and seasonal variation of large (≥10 kg) Yellowfin Tuna (YFT) catch per unit effort (CPUE) have been investigated and the influence of sea surface temperature (SST) and chlorophyll-a on these variables examined. We used fish landing data from West Nusa Tenggara recorded every month between 2012 and 2017 and analyzed using generalized linear models and generalized additive models. We found a seasonal and annual pattern of tuna abundance affected by SST and chlorophyll-a (chl a) and related to upwelling and El Nino event. These results also suggest that a two-month closure to fishing in August and September in southern Lombok is worth considering by the Government to maximize conservation of stocks due to a high abundance of juveniles emerging during the upwelling months from June to August.

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Section: Introductionmentioning

confidence: 99%

Catch per Unit Effort Dynamic of Yellowfin Tuna Related to Sea Surface Temperature and Chlorophyll in Southern Indonesia

Wiryawan

Loneragan

Mardhiah

et al. 2020

Fishes

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“…Longtail tuna (Thunnus tonggol) is a neritic species found in Indo-Pacific shallow, coastal, tropical and subtropical waters (Restiangsih and Hidayat 2018). This tuna species has a wide distribution across Indonesia, including Aceh (Rahmah et al 2019), Java Sea (Widodo et al 2011;Fitriani et al 2020;Hidayat et al 2020), Bali (Mahmud et al 2019), Lombok (Setyadji and Nugraha 2015), East Kalimantan (Alfian et al 2020), Sulu and Sulawesi Sea (Wanchana et al 2015). Indonesia is listed as one of countries with the highest contributions to longtail tuna catches (31%) in Asia (Kumar and Kocour 2015;Abdussamad et al 2012).…”

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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“…Lokasi pengumpulan data difokuskan di Pelabuhan Perikanan Tanjung Luar, Lombok Timur pada Januari hingga Desember 2016. Tanjung luar merupakan salah satu pusat pendaratan utama bagi perikanan TCT di Lombok, selain Labuhan Lombok (Setyadji & Nugraha, 2015). Ukuran panjang tongkol komo dikumpulkan secara acak setiap bulannya dan dikombinasikan dari hasil tangkapan berbagai armada 93-107 perikanan skala kecil, seperti pancing ulur dan tonda, jaring insang, serta pukat cincin yang beroperasi pada area 8 0 44' hingga 11 0 15' LS dan 116 0 15' hingga 120 0 40' BT (Gambar 1).…”

Section: Bahan Dan Metode Pengumpulan Dataunclassified

ESTIMASI PARAMETER POPULASI DAN RASIO POTENSI PEMIJAHAN TONGKOL KOMO (Euthynnus affinis, Cantor 1849) DI PERAIRAN SELATAN LOMBOK

Wujdi

Hartaty

Setyadji

2020

JURNAL PENELITIAN PERIKANAN INDONESIA

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Tongkol komo (Euthynnus affinis) merupakan salah satu komoditas ekonomis tinggi perikanan tuna neritik, terutama bagi armada tuna skala kecil. Seiring dengan meningkatnya intensitas penangkapan pada satu dekade terakhir, diperlukan kajian kuantitatif terkait keberlangsungan stok. Akan tetapi, minimnya data yang tersedia pada perikanan jenis ini merupakan tantangan terbesar dalam melakukan usaha pengelolaan. Penelitian ini bertujuan untuk menduga parameter populasi dan rasio potensi pemijahan (SPR) berbasis ukuran panjang, sebagai titik acuan biologis kondisi stok dalam menghadapi tekanan penangkapan. Total 1.321 data ukuran panjang dikumpulkan secara acak setiap bulan selama Januari hingga Desember 2016 di Tanjung Luar. Parameter populasi meliputi pertumbuhan, kematian, rekrutmen, dan laju pemanfaatan diestimasi dengan metode ELEFAN. Analisis SPR juga dilakukan dengan melibatkan parameter reproduksi yang disintesis dari penelitian sebelumnya dengan paket LB-SPR. Hasil penelitian menunjukkan bahwa formula pertumbuhan von Bertalanffy diekspresikan dengan persamaan Lt = 85,0 (1-e-0,7 (t+0,173)). Meskipun rata-rata sampel tongkol komo diprediksi telah matang gonad/memijah (SL50>L50), namun sumberdaya tongkol komo mengalami tekanan yang tergolong tinggi dan mengganggu rekrutmen individu baru ke dalam stok yang diindikasikan dengan parameter lainnya seperti rasio mortalitas penangkapan relatif (F/M) = 2,15, laju eksploitasi (E) = 0,68, dan SPR = 23%. Oleh karena itu, diperlukan penyusunan pengelolaan yang efektif untuk kelestarian perikanan. Eastern little tuna or commercially known as kawakawa is listed as one of the most economically important species of neritic tuna, especially caught by small-scale tuna fisheries. Increasing fishing pressure in the last decade should be responded by a quantitative analysis on its stock. The problem arises when this typical fishery usually possesses limited time-series data. This study intended to estimate population parameters and spawning potential ratio (SPR) as a biological reference point to state the healthiness of fishery corresponding to the fishing pressure around coastal areas. A total of 1,321 length measurement data were randomly sampled monthly from January to December 2016 in Tanjung Luar. Population parameters including growth, mortality, recruitment, and exploitation rate were estimated by applying the ELEFAN method. SPR analysis was also carried out by involving reproduction parameters synthesized from previous studies using the LBSPR package. The results showed that the von Bertalanffy growth functions were expressed by the equation Lt = 85.0 (1-e-0.7(t + 0.173)). Although the majority of kawakawa was predicted in maturity as indicated by SL50>L50, high exploitation has occurred to the fishery that can be interfered the recruitment to the stock, as confirmed by other parameters, such as relative fishing mortality (F/M) = 2.15, exploitation rate (E) = 0.68, and SPR = 23%. Hence, the establishment of appropriate management strategies is needed to aim fishery sustainability.

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Dynamics of Gears, Fleets, Catch and Fishing Season of Smallscale Tuna Fisheries in Labuhan Lombok, West Nusa Tenggara

Cited by 5 publications

References 5 publications

Catch per Unit Effort Dynamic of Yellowfin Tuna Related to Sea Surface Temperature and Chlorophyll in Southern Indonesia

Catch per Unit Effort Dynamic of Yellowfin Tuna Related to Sea Surface Temperature and Chlorophyll in Southern Indonesia

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

ESTIMASI PARAMETER POPULASI DAN RASIO POTENSI PEMIJAHAN TONGKOL KOMO (Euthynnus affinis, Cantor 1849) DI PERAIRAN SELATAN LOMBOK

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