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POTENTIALS YIELD AND FISHERIES OF MALAHAYU RESERVOIR, BREBES Setiya Triharyuni; Aisyah Aisyah; Chairulwan Umar; Husnah Husnah
Indonesian Fisheries Research Journal Vol 25, No 1 (2019): (June) 2019
Publisher : Research Center for Fisheries

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1005.483 KB) | DOI: 10.15578/ifrj.25.1.2019.11-17

Abstract

Fishing activity in Malahayu Reservoir has been done since long time. Unlimited fishing may impact to the decresing of fish resources of those waters. This study presents an assessment of fishing practices in Malahayu reservoir between 2008-2016 periods. Data of potential fish production and catch per unit effort were estimated by using different estimate models, catch per unit effort was analyzed annually, while potential fish production was analyzed by using five models namely model by Henderson & Welcome (1974), Teows & Griffith (1979), Marshal (1984), Moreau & De Silva (1991) and Crul (1992). The results show that changes of fish composition has accured, which was originally dominated by native fish while for now it is dominated by 72,05% of tilapia (Oreochromis niloticus) as an introduced fish. Furthermore, the average catch per unit effort (CPUE) in Malahayu reservoir is about 11,82 kg / fisherman, while the average potential production is about 198,55 kg / year. CPUE value and potential production indicate that exploitation rate in Malahayu Reservoir are in fully-exploited or perhaps over-exploited condition. Related to those conditions, not to increase the number of efforts (fishermen) as a management option towards sustainable fisheries.
SPATIAL AND TEMPORAL DISTRIBUTION OF FISH IN THE FLOODPLAIN OF KUMBE RIVER. PAPUA Yoga Candra Ditya; Arif Wibowo; Husnah Husnah
Indonesian Fisheries Research Journal Vol 24, No 2 (2018): (December) 2018
Publisher : Research Center for Fisheries

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (362.038 KB) | DOI: 10.15578/ifrj.24.1.2018.1-13

Abstract

Expansion of land clearance mostly for plantation is the big issue in Indonesia including in Papua. Its effect is not only to the catchment area but it also affects fisheries resources. The stress effect occurs worsen in Kumbe River and its floodplain area by the present of introduced fish species such as snakehead (Channa striata) and nile tilapia (Oreochromis niloticus). Spatial and temporal fish distributions are important information for the sustainable fisheries resource and theirs utilization. Study on spatial and temporal fish distribution covering four types of swamp ecosystem of Kumbe River was conducted during April-September 2014 and Mei-November 2015. Explorative field survey was conducted in four different ecosystem types in Kumbe River floodplain areas. Ecological data was collected from four sampling sites in each ecosystem type during high water precipitation (April and May) and low water precipitation (August. September and November). and fish samples were collected with different mesh sizes of gillnet fishing experiment conducted in four sampling sites. Parameters measured were fish important relative index and physical and chemical water quality parameters. The results noted 18 fish species deriving from 13 families. The Arridae with its blue catfish (Neoarius graeffei) dominated almost 90% of fish catch both spatial and temporal. Hydrological dynamic seems the key of trigger factor for the spatial and temporal distribution of fish and dynamic of habitat and water quality characteristic in the floodplain of Kumbe River.
ESTIMASI STATUS STOK SUMBER DAYA KEPITING BAKAU (Scylla serrata) DI ESTUARI MAHAKAM, KALIMANTAN TIMUR Aisyah Aisyah; Kamaluddin Kasim; Setiya Triharyuni; Husnah Husnah
BAWAL Widya Riset Perikanan Tangkap Vol 10, No 3 (2018): (Desember) 2018
Publisher : Pusat Riset Perikanan, BRSDM KP.

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1065.624 KB) | DOI: 10.15578/bawal.10.3.2018.217-225

Abstract

Produksi nasional kepiting bakau yang terus menurun serta semakin sulitnya nelayan menangkap kepiting bakau di habitat aslinya, menjadi indikator terjadinya ancaman keberlanjutan sumberdaya di alam. Kepiting bakau (Scylla serrata) merupakan salah satu komoditas perikanan penting propinsi Kalimantan Timur, yang sebagian besar berasal dari hasil tangkapan nelayan di sekitar perairan Delta Mahakam. Informasi status stok kepiting bakau di Estuari Mahakam belum tersedia sehingga menjadi kendala dalam menyusun kebijakan pengelolaan sumberdaya kepiting bakau pada skala daerah dan nasional. Penelitian ini dimaksudkan untuk mengetahui status stok kepiting bakau di Estuari Mahakam dengan menggunakan metode rasio potensi pemijahan induk berbasis data panjang (Length-Based Spawning Potential ratio/SPR), dalam kurun waktu 5 bulan, yaitu November 2016-Maret 2017. Hasil analisis menunjukkan bahwa nilai SPR saat ini (actual estimate) diperoleh sebesar 0,43 atau sebesar 43% sehingga dikategorikan sebagai fully-moderate exploited karena masih berada di atas ambang batas yang telah ditetapkan sebesar 30%. Nilai SPR 43% mengindikasikan bahwa masih terdapat biomassa kepiting bakau dewasa sebesar 43% di alam, untuk menunjang keberlanjutan rekruitmen. Di samping itu, laju penangkapan (F) terhadap mortalitas alami (M) yang mencapai 0,86 menunjukan bahwa kematian alami lebih mendominasi dibandingkan tekanan penangkapan.The decreasing in national production of mangrove crab and the difficulties for fishermen to catch mangrove crab in its natural habitat, become an indicator of the threatened of those resources in nature. Mangrove Crab (Scylla serrata) is one of the important fishery commodities of East Kalimantan province, mostly caught around the waters of Mahakam Estuary. Meanwhile, information concerning the stock status of mangrove crab in Mahakam Estuary is not yet available so it becomes an obstacle in formulating policies related to the management of mangrove crab resources at the regional and national scale. This research is intended to know the stock status of mangrove crab (Scylla serrata) in Mahakam Estuary by using Length-Based Spawning Potential ratio (SPR). The result of analysis show that the value of the current SPR (actual estimate) is 0,43 or 43%, it is categorized as fully-moderate exploited because it is still above the predefined threshold of 30%. The SPR value indicates about 43% of mature crabs biomass are still available to support the sustainability of recruitment. Nevertheless, the rate of capture (F) on natural mortality (M) has reached 0,86 which is mean that fishing exploitation has contributed 86% to the mortality of mangrove crab in its habitat.