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

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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.
Evaluation of the water suitability of floating net cages aquaculture in Kedung Ombo Reservoir, Central Java Bawono, Pramesthi Mustikaning; Rahman, Arif; Ain, Churun; Haeruddin, Haeruddin; Prakoso, Kukuh; Arifati, Atika
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 14, No 1 (2025): MARCH 2025
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.14.1.44159

Abstract

Kedung Ombo Reservoir is one of the reservoirs in Central Java which is used for irrigation, tourism, and aquaculture activities. Common problems in reservoir waters are nutrient enrichment by organic waste from fish feed and other sources. The aim of this study was to evaluate the level of water suitability based on water quality. This study was conducted in June-August 2023. Sampling was carried out at three stations with different floating net cage densities. The water quality variables measured included dissolved oxygen (DO), temperature, pH, transparency, turbidity, ammonia, biochemical oxygen demand (BOD), nitrate, phosphate, and chlorophyll-a. Evaluation of the water suitability for floating net cage waters in Kedung Ombo Reservoir was determined by a weighting matrix and water suitability index. The water suitability evaluation of floating net cages in three stations was categorized as suitable. All variables were suitable except BOD at all stations and DO in stations 1 and 3.Keywords:Dissolved oxygenFloating net cageKedung Ombo ReservoirSuitabilityWater quality
Evaluation of the water suitability of floating net cages aquaculture in Kedung Ombo Reservoir, Central Java Bawono, Pramesthi Mustikaning; Rahman, Arif; Ain, Churun; Haeruddin, Haeruddin; Prakoso, Kukuh; Arifati, Atika
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 14, No 1 (2025): MARCH 2025
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.14.1.44159

Abstract

Kedung Ombo Reservoir is one of the reservoirs in Central Java which is used for irrigation, tourism, and aquaculture activities. Common problems in reservoir waters are nutrient enrichment by organic waste from fish feed and other sources. The aim of this study was to evaluate the level of water suitability based on water quality. This study was conducted in June-August 2023. Sampling was carried out at three stations with different floating net cage densities. The water quality variables measured included dissolved oxygen (DO), temperature, pH, transparency, turbidity, ammonia, biochemical oxygen demand (BOD), nitrate, phosphate, and chlorophyll-a. Evaluation of the water suitability for floating net cage waters in Kedung Ombo Reservoir was determined by a weighting matrix and water suitability index. The water suitability evaluation of floating net cages in three stations was categorized as suitable. All variables were suitable except BOD at all stations and DO in stations 1 and 3.Keywords:Dissolved oxygenFloating net cageKedung Ombo ReservoirSuitabilityWater quality
Co-Authors Arif Rahman Bawono, Pramesthi Mustikaning Budi Raharjo Churun Ain Haeruddin Haeruddin Kukuh Prakoso, Kukuh Nugroho, Supradianto Santoso Budi Widiarto