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All Journal Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan
Prehadi, Prehadi
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Earth & Planetary Sciences Education Engineering

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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.
Morphological identification of the soft coral, Clavularia inflata, reveals different sclerite characters across Indonesian coral reefs Subhan, Beginer; Bengen, Dietriech G; Ferse, Sebastian; Dzulfannazhir, Fauzan; Anggraini, Nurlita Putri; Santoso, Prakas; Arafat, Dondy; Sani, Lalu M. Iqbal; Prehadi, Prehadi; Madduppa, Hawis
Depik Vol 11, No 2 (2022): August 2022
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.11.2.22102

Abstract

Soft corals of the genus Clavularia (Blainville 1830) have complex and difficult to distinguish morphological characteristics, making them rather difficult to identify. A paucity of information exists for Indonesian coral reefs, a complex biogeographic region at the confluence of the Pacific and Indian Ocean that covers an extensive geographic area and several marine ecoregions, is subject to several ocean current systems, and includes a high diversity of habitats. Specimens of Clavularia inflata were collected from eleven study sites across the Indonesian archipelago, morphologically described based on their sclerite characteristics, and compared among sites. Sclerite observations were divided into four parts for each colony, namely pinnules, crowns, calyces, and stolons. The sclerites found in C. inflata comprised various forms such as rods, fingers, sticks, and brackets. Morphometric measurements of C. inflata showed specimens from Kepulauan Seribu had the largest pinnule, calyx, and stolon sclerites compared to other locations. The maximum mean size of crown sclerites was observed for specimens from Maluku Tenggara Barat. Similarities in the shape of sclerites resulted in specimens from Kangean, Morotai, Tanjung Lesung, Bontang, Lombok and Natuna forming a cluster, while those from Maluku Tenggara Barat and Arborek were dissimilar to other sites. Smaller sclerite sizes in specimens from Arborek are likely related to strong currents at that site. In conclusion, there were variations in the size of sclerites across the eleven study sites, with several sites forming a cluster of similar sclerite dimensions. Further studies using molecular markers are suggested to further explore the possibility of cryptic species.
Co-Authors Anggraini, Nurlita Putri Beginer Subhan Diah Ayuningrum, Diah Dietriech Geoffrey Bengen Dondy Arafat Dzulfannazhir, Fauzan Fahlevi, Arief Reza Fenetiruma, Syamsudin Ferse, Sebastian Hawis H Madduppa Herettrenggi, Rosa Junaedy, Ahmad Kintani, Novia Indah Kusumarani, Dheni Malaihollo, Jantje Jacobus Muttaqin, Ahmad Sabilul Raunsai, Jhoni Elias Raweyai, Oktofianus Obaja Sani, Lalu M. Iqbal Santoso Budi Widiarto Santoso, Prakas Sombo, Hendrik