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All Journal Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Bawal : Widya Riset Perikanan Tangkap Jurnal Kelautan dan Perikanan Terapan (JKPT)
Nugroho, Supradianto
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education

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Estimating Population Abundance Of Seahorse In Sebong Bay, Bintan Island Nugroho, Supradianto; Fadhilah, Nur; Sujatmiko, Tri Nur
Jurnal Kelautan dan Perikanan Terapan (JKPT) Vol 6, No 1 (2023): (Juni, 2023)
Publisher : Politeknik Ahli Usaha Perikanan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jkpt.v6i1.11159

Abstract

The decline in seahorse populations in the wild due to high fishing activity and habitat degradation prompted the inclusion of all seahorse species in Appendix II of CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora) in 2002. By being included in Appendix II of CITES, data and information on the abundance of seahorse populations become crucial as the basis for determining the quota for fishing and trade. Estimating population abundance of seahorse requires knowledge of habitat area, which can be modeled using the MaxEnt (maximum entropty). In this study, an estimation of the abundance of seahorses was carried out in the waters of Sebong Bay, Bintan Island. MaxEnt modeling was implemented with data on seahorse presence locations and environmental parameter maps consisting of chlorophyll-a as primary productivity parameter, benthic habitat as habitat type parameter, and dissolved oxygen, salinity, and pH as physiological parameters. From this model, the value of the area of suitable habitat for seahorses is 54,6 ha, while the density of seahorse in this area is 60 ind/ha, so it can be determined that the abundance of seahorses in the Sebong Bay is 3.276 individuals. Therefore, seahorse population in Sebong Bay is critically endangered since it is below the number of individuals that required to prevent the loss of quantitative genetic variation in a species.
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.
PENDUGAAN STATUS PERIKANAN TERUBUK (Tenualosa macrura) DI PERAIRAN SELAT BENGKALIS, RIAU Nugroho, Supradianto; Supratmi, Supratmi; Syahrian, Windi; Nusari, Dewi Megapuspa; Faeyumi, Muhammad; Yulianda, Muhammad; Hadinata, Eka Fajri
BAWAL Widya Riset Perikanan Tangkap Vol 12, No 3 (2020): (Desember) 2020
Publisher : Politeknik Kelautan dan Perikanan Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/bawal.12.3.2020.119-126

Abstract

Ikan terubuk merupakan jenis ikan pelagis kecil yang memiliki nilai ekonomis penting bagi masyarakat di sekitar Selat Bengkalis. Tingginya harga telur terubuk menyebabkan tekanan penangkapan yang tinggi terhadap ikan ini. Ikan terubuk telah ditetapkan sebagai ikan yang dlindungi secara terbatas, dengan memberlakukan larangan tangkap di hari dan bulan tertentu melalui Keputusan Menteri Kelautan dan Perikanan No.59 Tahun 2011. Kajian ini bertujuan untuk menduga stok ikan terubuk dengan metode rasio potensi pemijahan (spawning potential ratio/SPR). SPR didefinisikan sebagai rasio potensi memijah suatu stok ikan setelah dieksploitasi terhadap sejumlah tekanan penangkapan. Keunggulan dari metode ini adalah dapat digunakan pada kondisi data terbatas serta dapat memberikan masukan untuk upaya penangkapan tahun berikutnya. Hasil penghitungan parameter pertumbuhan ikan terubuk didapatkan nilai k = 1,5/tahun, L∞ = 39,40 cmSL dan nilai mortalitas alami M = 2,23/ tahun. Nilai SPR perikanan terubuk diestimasi sebesar 15%, yang berarti bahwa status eksploitasi ikan terubuk dalam kondisi over exploited, jauh di bawah batas minimal nilai SPR yang ditetapkan. Untuk mencapai nilai SPR target sebesar 50%, upaya penangkapan ikan terubuk harus dikurangi sekitar 8,36% dari upaya penangkapan tahun sebelumnya.
Co-Authors Arifati, Atika Budi Raharjo Faeyumi, Muhammad Hadinata, Eka Fajri Nur Fadhilah Nusari, Dewi Megapuspa Santoso Budi Widiarto Sujatmiko, Tri Nur Supratmi, Supratmi Syahrian, Windi Yulianda, Muhammad