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Santoso Budi Widiarto
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STOCK RECOVERY EFFORTS OF SHORTFIN MAKO SHARK (Isurus oxyrinchus Rafinesque, 1810) LANDED AT CILACAP OCEAN FISHING PORT (PPS Cilacap) Raharjo, Budi; Nugroho, Supradianto; Widiarto, Santoso Budi; Arifati, Atika
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.20.3.141-147

Abstract

The high exploitation rates of several shark groups in Indonesia have the potential to threaten the sustainability of their populations. The shortfin mako shark (Isurus oxyrinchus) represents one of the most significant catches of shark species in the Indian Ocean, with a considerable portion of these catches landing at the Cilacap Ocean Fishing Port. Studies on the recovery of shark stocks must be conducted to provide effective management plans that will prevent overexploitation. The objective of this study is to ascertain the exploitation status of I. oxyrinchus and to develop a simulation model for its stock recovery. The data on the total catch of shortfin mako shark (I. oxyrinchus) in the period between 2009 and 2022 in the statistical report of Cilacap Ocean Fishing Port, were subjected to analysis using the CMSY (Catch-based Maximum Sustainable Yield) method. The analysis demonstrated that the total sustainable catch (MSY) was 9.6 tons, with an exploitation rate of 2.61. The utilization rate falls within the red zone, indicating that overfishing has occurred. The simulation results from several stock recovery scenarios indicated that a reduction in fishing mortality to 5% of FMSY (fishing mortality) would be required to achieve stock recovery in approximately 10 years. The implementation of stock recovery for I. oxyrinchus by reducing fishing pressure can be achieved by setting a maximum catch limit. Therefore, the establishment of a maximum catch limit represents a crucial conservation effort for this species, as well as a form of implementation of the CITES policy in Indonesia.
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.
SHARK SPECIES COMPOSITION AND DISTRIBUTION OF FISHING GROUND BASED ON FISHING GEAR IN CILACAP OCEAN FISHERY PORT Novianto, Dian; Widiarto, Santoso Budi; Muslim, Anhar; Aji, Miftah Wahyu Purnomo; Prakoso, Kukuh
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 20, No 4 (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.20.4.197-206

Abstract

This study focuses on shark species composition, fishing techniques, and geographical distribution in the South Java Waters of Cilacap Ocean Fishing Port (COFP) during 2023. From the data collected, 18 shark species from 8 families were landed, with Alopias superciliosus as the dominant species (29%), followed by Carcharhinus falciformis (25%), and Alopias pelagicus (18%). Shark fishing was conducted with various gears such as tuna longline, drift longline, longline, drift gillnet, and bottom gillnet, with drift longline being the most effective gear with the largest contribution to the catch. Most of the sharks caught were categorized as endangered (EN) and vulnerable (VU) based on the IUCN conservation list, and listed in Appendix II of CITES. The results show that the geographic distribution of shark fishing grounds covers a wide area from the coast to the Indian Ocean, with high concentrations in the waters around Kebumen to the south of Yogyakarta. Fishing activities often overlap between fishing gears, increasing the risk of overfishing. Length distributions and maturity rates of sharks also indicate that many mating-ready adults are being caught, threatening slow population regeneration. To ensure the sustainability of shark populations and maintain the balance of marine ecosystems, a holistic and data-driven management strategy is needed. This includes strengthening regulations, raising public awareness through conservation education, and developing collaborative approaches involving fishers, government, and conservation organizations. Consistent law enforcement is also key in minimizing violations and ensuring the sustainability of shark fisheries in Indonesia.
Co-Authors AA Sudharmawan, AA Afandi, Mesti Putri Aji, Miftah Wahyu Purnomo Arafat, Gulam Arifati, Atika Beginer Subhan Budi Raharjo Diah Ayuningrum, Diah Dian Novianto Fahlevi, Arief Reza Fahlevi, Arif Reza Fenetiruma, Syamsudin Herettrenggi, Rosa Hidayat, Filialdi Nur Junaedy, Ahmad Kintani, Novia Indah Kukuh Prakoso, Kukuh Kusumarani, Dheni Latulanit,, M. Nasrul Malaihollo, Jantje Jacobus Mamayu Utami, Ikha Jayanti Muslim, Anhar Muttaqin, Ahmad Sabilul Nugroho, Supradianto Prehadi, Prehadi Raunsai, Jhoni Elias Raweyai, Oktofianus Obaja Setiadi, Didik Sombo, Hendrik Widyasari, Ferliana