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All Journal Jurnal Teknologi Perikanan dan Kelautan Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut ILMU KELAUTAN: Indonesian Journal of Marine Sciences Journal of Fisheries Resources Utilization Management and Technology JURNAL ENGGANO Jurnal Sumberdaya Akuatik Indopasifik Jurnal Airaha JURNAL BAHARI PAPADAK Journal of Fisheries & Marine Jurnal Megaptera
Ganang Dwi Prasetyo
Politeknik Kelautan Dan Perikanan Kupang
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Immunology & microbiology Library & Information Science Physics Social Sciences Other

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Physical Degradation of Toli Shad Gillnet: Breaking Strength, Elongation, and Fisheries Implications Mardiah, Ratu Sari; Park , Subong; Yurizal , Yurizal; Nugraha , Erick; Rasdam , Rasdam; Prasetyo, Ganang Dwi; Khikmawati, Liya Tri; Febriyanto , Fredi; Purwanto , Yuli; Isman, Khairudin
Jurnal Ilmiah Perikanan dan Kelautan Vol. 17 No. 3 (2025): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v17i3.74560

Abstract

Graphical Abstract   Highlight Research Synthetic nets, widely used in aquaculture and marine fishing, experience reduced performance over time due to environmental exposure. The study analyzes the effectiveness of Toli shad gillnets based on their technical age using statistical and experimental methods. A strong negative correlation exists between technical age and both breaking strength (r = -0.972) and elongation (r = -0.92). Toli shad gillnets perform optimally within 2 to 3 years of use, with effectiveness declining by the fourth year as indicated by scores of 40–59, suggesting adequate performance but the need for targeted improvements. Medium-term maintenance should be performed annually throughout the net’s service life, up to a maximum of 7 years, while replacement is recommended starting in the 4 year to mitigate performance degradation.     Abstract Synthetic nets have high elasticity and are widely used for both aquaculture and marine fishing. However, as their technical age increases, their performance declines due to wear, reduced breaking strength, and decreased elongation caused by continuous exposure to the marine environment. Monitoring the technical age of nets is crucial to maintaining the effectiveness of Toli shad gillnets, minimizing losses, and ensuring optimal catch yields. This study aims to examine the physical degradation of synthetic gillnets used in Toli shad (Tenualosa macrura) fisheries based on their technical age. This study utilized gillnets targeting toli shad (Tenualosa macrura), with varying technical ages (control net, 1-year, 2-year, and 3-year nets), all made from polyamide (PA) monofilament. The differences in net dimensions were attributed to variations in their service life. The method used is purposive sampling, analyzed using descriptive statistics, correlation analysis, a Completely Randomized Design (CRD), and effectiveness evaluation. The results show that the structure of Toli shad gillnets consists of mesh sizes of 77.82–99.60 mm, thread diameters of 0.34–0.53 mm, and knot heights of 1.52–2.28 mm. The relationship between technical age and breaking strength has a correlation coefficient (r) of -0.972, an R² of 0.94, and a regression equation of y = 9.85 - 1.31x. The LSD test indicates a significant difference in breaking strength across treatments. The correlation between technical age and elongation has an r-value of -0.92, an R² of 0.86, with the equation y = 20.11 - 0.34x. The LSD test shows that the control net has significantly different elongation compared to others, but nets aged 1, 2, and 3 years show no significant differences. The study concludes that Toli shad gillnets remain effective for up to 3–4 years, with an effectiveness value of ≥50%. The implications of this study contribute to the efficient management of fishing nets by informing maintenance and replacement strategies based on the technical age and mechanical degradation of the gear. These findings suggest the importance of integrating net lifespan into gear management to enhance catch performance and sustainability in small-scale fisheries.
Status Dan Tingkat Pemanfaatan Ikan Kakap (Lutjanus sp.) Di Perairan Manggarai Barat, Nusa Tenggara Timur Sadir, Edizul Adiwijaya; Prasetyo, Ganang Dwi; Gomez, Grandhi Kaenato Da; Ratung, Agustinus Apriyadi Hanggum; Ariana, Made; Hermawan, Fajar
JURNAL MEGAPTERA Vol 3, No 1 (2024): Jurnal Megaptera (JMTR)
Publisher : Politeknik Kelautan dan Perikanan Kupang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jmtr.v2i2.13674

Abstract

Penentuan komoditas ikan unggulan disuatu daerah merupakan langkah awal menuju pembangunan dan pengelolaan perikanan tangkap yang berpijak pada konsep efisiensi untuk meraih keunggulan komparatif dan kompetitif dalam menghadapi globalisasi perdagangan baik ditinjau dari sisi penawaran maupun permintaan, serta keunggulan daya saing tinggi. Tujuan penelitian ini adalah untuk mengetahui komoditi perikanan kakap yang potensial dan menghitung potensi serta tingkat pemanfaatanya. Penelitian ini dilakukan dengan menggunakan metode survei dan observasi lapangan. Pengumpulan data dilakukan dua tahap yaitu pengumpulan data primer di lapangan dengan pengamatan langsung dan data sekunder menggunakan kuesioner. Sumber data diperoleh berdasarkan informasi dari responden melalui wawancara dengan daftar pertanyaan atau kuesioner. Analisis data yang digunakan adalah menghitung produktifitas penangkapan dengan CPUE, menghitung Fishing Power Index (FPI) dan analisis potensi lestarai dan tingkat pemanfaatan (MSY dan Foptimum). Hasil penelitian menunjukan besarnya potensi lestari (MSY) ikan kakap (Lutjanus sp.) di perairan Manggarai Barat adalah sebesar 906 ton/tahun dengan upaya optimum (FOptimum) adalah 1.664 unit/tahun, jumlah tangkapan yang di ijinkan (JTB) adalah sebesar 80% dari MSY yaitu 725 ton/tahun dan tingkat pemanfaatan mencapai 100% (over exploited). Tingkat pemanfaatan potensi ikan kakap (Lutjanus sp) di Manggarai barat sejak tahun 2018 sampai 2019 telah melebihi JTB dari ikan kakap tersebut sehingga perlu adanya pembatasan jumlah upaya pemanfaatan agar dapat menjaga kelestarian ikan kakap (Lutjanus sp.) di Perairan Manggarai Barat.Determination of superior fish commodities in an area is the first step towards the development and management of capture fisheries based on the concept of efficiency to gain comparative and competitive advantages in the face of trade globalization both in terms of supply and demand, as well as high competitive advantage. The purpose of this study was to determine the potential snapper fishery commodity and calculate the potential and level of utilization. This research was conducted using survey methods and field observations. Data collection was carried out in two stages, namely primary data collection in the field by direct observation and secondary data using questionnaires. Sources of data obtained based on information from respondents through interviews with a list of questions or questionnaires. Data analysis used to calculate fishing productivity with CPUE, calculate Fishing Power Index (FPI) and analysis of sustainable potential and utilization rate (MSY and Foptimum). The results showed the magnitude of the sustainable potential (MSY) of snapper (Lutjanus sp.) in the waters of West Manggarai was 906 tons/year with the optimum effort (Foptimum) was 1,664 units/year, the number of allowable catches (JTB) was 80 % of MSY is 725 tons/year and the utilization rate reaches 100% (over exploited). The potential utilization rate of snapper (Lutjanus sp) in West Manggarai from 2018 to 2019 has exceeded the JTB of the snapper so it is necessary to limit the number of utilization efforts in order to maintain the sustainability of snapper (Lutjanus sp.) in West Manggarai waters. Suggestions in optimizing fishing effort or effort need to be analyzed first about the most effective, efficient and environmentally friendly fishing gear in the utilization of snapper resources.
Co-Authors Ali Muqsit Ali ulat, Muhamad Ariana, Made Aristi Dian Purnama Fitri Febriyanto , Fredi Gomez, Grandhi Kaenato Da Hermawan, Fajar Jhon Septin Maurisdo Siregar Khairudin Isman Liya Tri Khikmawati, Liya Tri Mardiah, Ratu Sari Mochammad Riyanto Mohammad Akhid Yunanto Noar Muda Satyawan Noveldesra Suhery Nugraha , Erick Park , Subong Perdana Putra Kelana Polin, Charlens Prayitno, Muhamad Riyono Edi Purnama, I Wayan Angga Purwanto , Yuli Radjab, Resky A. Rafis Tri Sandi Dimu Rajab, Resky Amalia Rasdam , Rasdam Rasdam Rasdam Rasdam Rasdam Ratung, Agustinus Apriyadi Hanggum Ronny I. Wahju Roza Yusfiandayani Sadir, Edizul Adiwijaya Saputra, Aman Shiffa Febyarandika Shalichaty Siahaan, Irandha C. M. Siahaan, Irandha Citra M. Soepardi, Sugiono Sugiono Sugiono Sugiono Sugiono Tanjov, Yulia Estmirar Taufik Yulianto Tiku, Mathius Triyono, Heri Tyas Dita Pramesthy Widagdo, Aris Yurizal , Yurizal