Dede Irving Hartoto, Dede Irving
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DISTRIBUSI LOKAL CARIDINA SPP. DAN ATYA SPINIPES (CURSTACEA; ATYIDAE) DI SUNGAI CITAMANJAYA DAN CIBINUA KAWASAN UJUNG KULON Hartoto, Dede Irving
ZOO INDONESIA No 5 (1985): Zoo Indonesia No. 5
Publisher : Masyarakat Zoologi Indonesia

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The specimen collected
PHYTOPLANKTON CHANGES IN SOME INLAND WATER HABITAT OF CENTRAL KALIMANTAN, INDONESIA Sulastri, Sulastri; Hartoto, Dede Irving
BERITA BIOLOGI Vol 5, No 3 (2000)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

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The changes in the density, number of genera, diversity index of phytoplankton in some oxbow lakes (LakeRengas, Lutan,Takapan) and lowland lake (Lake Sembuluh) are described.Phytoplankton samples collected in rainy season, dry season (1995 to 1997) and in the forest fire period (October 1997).Before forest fire period, most of the time the density of phytoplankton was high (489 to 759 individuals/1) in January or rainy season especially in oxbow lake system. The high number of phytoplankton in rainy season is not common in the standing water in the floodplain system. This is probably because of the type of water that is acid water with the pH (4.43 to 4.66) in Lake Rengas, Lake Lutan (4.93 to 5.93) and Lake Takapan (4.03 to 4.64).In acid water oxbow lake, only some certain species occurred in the dry season. In January (rainy season),the inputs of water from main river increase the pH and presumably also nutrient, as shown by higher conductivity.In Lake Rengas, the highest density found in June that dominated by one genera (Oocystis).These facts probably because of phytoplankton input from the river Rungan that also show high density of the same species.It is also showed that the number the number of genera is also high in rainy season. Nonetheless of index diversity changes is not clear. In October 1997, when the forest fire period the density of phytoplankton and some genera as a group of Euglenophyceae increased.The highest density was found in Lake Sembuluh that range from 10,507 to 39,536 individuals/1.The phytoplankton density of Lake Rengas, Lutan and Takapan are 3,254, 1,414 and 9,019 respectively.The relationship of forest fire to the phytoplankton density is briefly discussed.
METALS BIOCONCENTRATION OF FRESHWATER FISHES IN CENTRAL KALIMANTAN AS AN EVALUATION CRITERIA FOR MANAGEMENT OF INLAND WATER FISHERY RESERVE Hartoto, Dede Irving; Awalina, Awalina
BERITA BIOLOGI Vol 5, No 3 (2000)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

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Heavy metal bioconcentration was examined and evaluated in the muscle of several of freshwater fishes species collected from a complex of some oxbow lakes in Kahayan River and from Lake Sembuluh, Central Kalimantan. The objective of the study was to find natural background values of heavy metals in water, sediment and its biomultiplication factor related to their concentration in water and the fish position in the foodweb. In this analysis,one to twenty-five grams of fish muscle samples was obtained from the posterior part of pectoral but anterior to anal fins. Water samples, which were taken from surface and bottom layers of the lakes, were mix and preserved with nitric acid. Sediment samples were obtained by using Ekman Grab and the interstitial waters were extracted by using wet digestion technique.Iron concentration in fish muscle is the highest in omnivorous, followed by that of in carnivorous and detritivorous fish. Manganese, lead and mercury had different pattern of bioconcentration levels. Bioaccumulation factor for each metal and at each food habit category was also variable; the lowest value of 0.7 for iron in second consumer and 28.2 for mercury in primary consumer. Mechanism of heavy metal intrusion to fish muscle is very intricate and apparently depends upon feeding habit of each species. Concentration of mercury in water and fish muscle was far above minimum risk level, but concentrations of iron, manganese and lead in water and fish was considered still safe for environment as well as for human health. Potential utilization of these results as evaluation criteria for fishery reserve is discussed.
ENVIRONMENTAL CONDITON, FISH RESOURCES AND MANAGEMENT OF MANINJAU LAKE OF WEST SUMATERA Sulastri, Sulastri; Hartoto, Dede Irving; Yuniarti, Ivana
Indonesian Fisheries Research Journal Vol 18, No 1 (2012): (June 2012)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

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A blooming of Microcytis aeruginosa occurred in Maninjau Lake in 2000. Mass fish killed happened frequently due to deterioration of water quality in this lake. This study is aimed to observe the current environmental condition, fishery resources status and the state of development process of comanagement regime in Maninjau Lake. Water quality parameter such as temperature, conductivity, turbidity, pH and dissolved oxygen (DO) were measured in situ by using Horiba U-10 water checker. Total nitrogen, ammonia, nitrate, nitrite, total phosphorous, orthophosohate and chlorophyll-a parameter were analyzed using standard method. Phytoplankton was analyzed by Lackey Drop Microtransect. Fish samples were obtained from fishers’ catch. Fisheries data were collected by enumerator, through Focus Group Discussion (FGD), and questioner list methods. Stakeholder analysis was conducted by focus group interview and discussion. In general, water quality parameters were suitable for the life of aquatic organisms except for DO and ammonia. These parameters indicated that the water quality of lake was still undergoing degradation process. Maninjau Lake is rich of nutrient as indicated by abundance of blue green algae. Bada fish (Rasbora argyrotaenia) is an important commodity and the fisheries significantly contributes to local people’ income. Current fisheries problems indicate the urgency of the management and conservation efforts. Several stakeholder groups showed their interest in management. The increment of institutional sustainability concern was reflected by the emergence of local wisdom and the demand for participatory development and management.
DISTRIBUSI SPASIAL, STATUS PEMANFAATAN, DAN UPAYA KONSERVASI PESUT MAHAKAM (Orcaella brevirostris) DI KALIMANTAN TIMUR Dharmadi, Dharmadi; Hartoto, Dede Irving; Nasution, Syahroma Husni; Oktaviani, Dian
Jurnal Penelitian Perikanan Indonesia Vol 15, No 1 (2009): (Maret 2009)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

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Penelitian dilakukan pada tahun 2004 - 2006 di Danau Semayang dan Muara Kaman (bagian dari Sungai Mahakam), Kalimantan Timur, melalui survei lapangan dan wawancara langsung dengan nelayan, masyarakat, dan Dinas Perikanan, Dinas Perlindungan Hutan dan Pelestarian Alam. Tujuan penelitian ini adalah untuk mengetahui penyebaran secara spasial, status pemanfaatan, dan upaya konservasi pesut Mahakam (Orcaella brevirostris). Hasil pengamatan menunjukkan bahwa distribusi pesut Mahakam secara spasial terdapat di Muara Kaman, Muara Sungai Pela Kecil, muara Sungai Pela Besar, Danau Semayang, dan Danau Melintang. Pada saat ini, pesut Mahakam di Sungai Mahakam digunakan sebagai wisata air bagi turis domestik maupun luar negeri. Upaya konservasi pesut Mahakan dapat dilakukan melalui perlindungan habitat dari pencemaran dan pendangkalan, perlindungan suaka perikanan yang berfungsi untuk penyedia makanan alami serta meningkatkan peran aktif masyarakat agar turut menjaga kelestarian pesut. This study was conducted during 2004 to 2006 in Semayang and Melintang Lakes, Mahakam segment around Muara Kaman River of East Kalimantan, through field survey methods, and directly interview to respective respondens of fishers, local people, Fisheries Regency Departement and Forest Protection and Natural Resources Conservation. The objective of the study was to elucidate the distribution spasial, utilization status, and conservation effort of freshwater dolphin (Orcaella brevirostris). Results show that the spasial distributions of freshwater dolphin were found in Kaman, Pela Kecil, Bank of Pela Besar Rivers, Semayang, and Melintang Lakes. Freshwater dolphines was used as echotourism for local and foreign tourisms. There are some efforts to conserve of freshwater dolphin in the East Kalimantan, namely habitat protection from pollution and sedimentation, fisheries area protection for providing natural food and to increase local people role in conserving the existence of these animals.