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All Journal AQUATIC SCIENCE & MANAGEMENT Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology
Sombo, Hendrik
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education

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Populasi hiu berjalan, Kalabia (Hemiscyllium freycineti), di Perairan Misool, Kabupaten Raja Ampat (Population of the walking shark, Kalabia (Hemiscyllium freycineti), in Misool, Raja Ampat) Widiarto, Santoso B; Wahyudin, Iman; Sombo, Hendrik; Muttaqin, Ahmad S; ., Prehadi; Tabalessy, Roger R; Masengi, Melisa
AQUATIC SCIENCE & MANAGEMENT Vol 8, No 1 (2020): APRIL
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.8.1.2020.30597

Abstract

Walking shark (Hemiscyllium freycineti) was classified in the Genus Hemiscyllium, a nocturnal organism, lives in benthic zone. Walking shark has limited distribution because of its inability to swim across the sea regardless the close range. Based on those information, the survey was conducted to monitor the potential density of walking shark populations at Misool, Raja Ampat, in order to have data of population and the utilization. This research was conducted by applying Snorkeling Visual Census Method along the coastline using Global Positioning System. A number of 58 individuals walking sharks was found during the survey and they varied from around 61-70 cm (the longest) to about 20 cm (the shortest). The most common size was of 31-40 cm. The length of the survey track was 20.003,74 m (20 km) and the observation area was 109.592,69 m2 with a survey track width of 11 m, so that the density of walking sharks was about 5,29 individuals/ha.Walking shark in Misool have not been used either for food consumption or in trade demand. It can be concluded, the level of density of walking sharks in Misool is under low pressure conditions.---Hiu berjalan (Hemiscyllium freycineti) tergolong dalam genus Hemiscyllium, yang merupakan hewan nokturnal yang hidup di dasar perairan. Hiu berjalan memiliki distribusi terbatas, karena jenis ini tidak mampu berenang menyeberangi laut yang dalam meskipun hanya berjarak beberapa kilometer. Berdasarkan informasi tersebut, maka dilakukan survei kepadatan populasi hiu berjalan di perairan Misool, Raja Ampat, guna memperoleh data populasi dan pemanfaatannya. Penelitian ini dilakukan dengan metode Snorkeling Visual Census dan survei menyusuri garis pantai berbasis Global Positioning System (GPS). Dari hasil survei, didapatkan jumlah ikan hiu berjalan yang tersensus sebanyak 58 individu dengan ukuran yang bervariasi dari terpanjang sekitar 61-70 cm dan ukuran terpendek 20 cm. Ukuran ikan hiu berjalan yang dominan ditemukan ialahdengan panjang tubuh 31-40 cm (sebanyak 16 individu). Survei ini mencakup panjang lintasan 20.003,74 m (20 km), luas area pengamatan 109.592,69 m2, dan lebar lintasan survei 11 m, sehingga kepadatan ikan hiu berjalan yang diperoleh dari hasil survei yaitu 5,29 individu/ha. Hiu berjalan di Misool belum banyak dimanfaatkan, baik secara konsumsi maupun permintaan perdagangan. Dengan demikian, dapat disimpulkan, bahwa tingkat kepadatan hiu berjalan di Misool dalam kondisi tekanan rendah.
BIOLOGICAL ASPECT AND ABUNDANCE OF TRITON EPAULETTE SHARK (Hemiscyllium henryi) ENDEMIC TO TRITON BAY, KAIMANA, WEST PAPUA Prehadi, Prehadi; Kintani, Novia Indah; Sombo, Hendrik; Fahlevi, Arief Reza; Junaedy, Ahmad; Muttaqin, Ahmad Sabilul; Raweyai, Oktofianus Obaja; Kusumarani, Dheni; Raunsai, Jhoni Elias; Fenetiruma, Syamsudin; Malaihollo, Jantje Jacobus; Herettrenggi, Rosa; Widiarto, Santoso Budi; Subhan, Beginer; Ayuningrum, Diah
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 20, No 3 (2024): SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijfst.20.3.133-140

Abstract

Walking shark is one of elasmobranch that has been protected by the government of the Republic of Indonesia and can be found in the eastern seawaters of Indonesia. There are six species of walking shark, one of it is Triton Bay Epaulette Shark (Hemiscyllium henryi) which is endemic to the coastal waters of Kaimana. There are still lack of information regarding biology abundance and population of H. henryi, therefore it is necessary to do a study related to this species. This study aims to determine individual information and abundance of H. Henryi in Kaimana coastal waters during the observation in 2022 and 2023 based on density value and potential area. The method used is a census based on the Global Positioning System, through snorkeling and walking along the coastline, as well as observations of total length, wet weight, and sex in H. henryi which encountered during census. The total census track is 5.783 meters with a sweep of 2,46 Ha monitoring area. The density or abundance of H. henryi in 2022 is 1,2 ind/Ha and in 2023 is 2,4 ind/Ha. Total length of H. henryi ranged between 55–88 cm (Mean 70,6 cm ± SD 12,29). The length and weight relationship obtained W=0,0004L3,4343 with R2 value of 0,9526. The abundance trend of H. henryi at the coastal waters of Kaimana in the last two years has multipled by 2 times based on density value determining after being designated as a fully protected fish species.
Co-Authors Beginer Subhan Diah Ayuningrum, Diah Fahlevi, Arief Reza Fenetiruma, Syamsudin Herettrenggi, Rosa Junaedy, Ahmad Kintani, Novia Indah Kusumarani, Dheni Malaihollo, Jantje Jacobus Melisa Masengi, Melisa Muttaqin, Ahmad S Muttaqin, Ahmad Sabilul Prehadi ., Prehadi Prehadi, Prehadi Raunsai, Jhoni Elias Raweyai, Oktofianus Obaja Roger R Tabalessy Santoso Budi Widiarto Wahyudin, Iman Widiarto, Santoso B