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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis Ecotrophic, Journal of Environmental Science Jurnal Geografi Journal of Sylva Indonesiana Multidiciplinary Output Research for Actual and International Issue (Morfai Journal) Jurnal Abdimas Maduma Serambi Engineering

Bejo Slamet

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Author-ID : 1873967

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Social Sciences Other

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Articles

EMBRYONIC DEVELOPMENT AND HATCHING EGGS RATIO OF BLACKSADDLED CORAL GROUPER (Plectropoma laevis) AT DIFFERENT TEMPERATURE MEDIA Wawan Andriyanto; Bejo Slamet; I Made Dharma Jaya Ariawan
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 5 No. 1 (2013): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

In seed production, the success of spawning and egg production is very important to mantain the cultivating sustainability. The quantity and quality of the blacksaddled coral grouper eggs should be properly manipulated to produce the higher values. The purpose of this study was to determine the effect of different temperatures on the results of hatch success (embryo development, incubation time, hatching rate and larvae abnormality). The eggs used were obtained from natural spawning and collected with egg collector. The fertilized eggs were incubated in four pieces of container and were treated with different temperatures of 26°C, 28°C, 30°C, and 32°C which each treatment was repeated 3 times. The incubation equipment with automatic temperature control was used in this treatment. The results showed that the eggs which were incubated at 32°C produced a faster of embryonic development and hatch within 14 hours while the temperature of 26°C took 18 hours to hatch. However, the temperature of 32°C resulted in low egg hatchability, with 60.29%, as well as the abnormalities of 8.42%. The best temperature of each treatment was obtained at the incubation temperature of 30°C, whereas the phase of the hatch was achieved within 15 hours, with egg hatchability of 92.25% and the abnormality of 6.29%. From these results, it can be concluded that the optimum incubation temperature for Blacksaddled coral grouper was 30°C. Keywords: hatching, egg of Blacksaddled coral grouper, Plectropoma laevis, incubation temperature.

THE GROWTH PATTERN OF BLACKSADDLED CORALGROUPER LARVAE (Plectropoma laevis LACEPÈDE, 1801) AND THEIR CONSUMPTION RATE TO ZOOPLANKTON ROTIFER (Brachionus rotundiformis) Regina Melianawati; Ni Wayan Widya Astuti; Bejo Slamet
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 4 No. 2 (2012): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Blacksaddled coralgrouper Plectropoma laevis has been started to conserve to prevent from over exploitation. The study purposes were to determine the growth pattern during larvae to juvenile stage of Blacksaddled coralgrouper and their consumption rate to zooplankton rotifers Brachionus rotundiformis. Domesticated broodstocks have been rearing in 100,000 l concrete tanks. The eggs from spawning broodstocks were hatched and the larvae have been kept to juvenile. Larvae rearing was done in 6,000 l concrete tanks. During the rearing period, larvae were fed with zooplankton rotifer, artemia and artificial food. Parameters measured were eggs and oil globule diameter, larval total length, length of larval dorsal fin and ventral fin, the number of zooplankton that consumed by larvae and water temperature. Microscopic method was used to measure the parameters. The result showed that eggs and oil globule diameter ranged in 800-850 μm and 168-200 μm, respectively. Total length of newly hatched larvae was 2.53±0.13 mm. The growth pattern of total length from larva to juvenile stage was exponential, while the growth pattern of dorsal fin and ventral fin length was linear. Larvae grew very fast after 35 days old. The pattern of larval consumption rate to zooplankton rotifers was linear. Time period from larvae to juvenile stage was 45-55 days on water temperature 27-29oC.Keywords: growth, consumption rate, rotifers, larvae, Blacksaddled coralgrouper

STUDI KUALITAS LINGKUNGAN PERAIRAN DI DAERAH BUDIDAYA PERIKANAN LAUT DI TELUK KAPING DAN TELUK PEGAMETAN, BALI Bejo Slamet; I Wayan Arthana; I W. Budiarsa Suyasa
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 3 No 1
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

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The purpose of this study was to know the coastal environmental quality of Kaping and Pegametan Bay coastal area. Thestudy was conducted from 14 stations with 3 replicates of water sampling and 5 replicates of makrozoobenthos sampling.The result showed that water quality namely TSS, DO, NH3 and BOD5 were still in line criterion stated by office of KLH(2004). About 49 species of makrozoobenthos were examined, with abundance of makrozoobenthos was 58-209 ind./ 1,125 cm2 anddiversity indeks was 1,56-2,91. The result on the integrated water quality analyses showed that the water quality all of station wasclassified to light pollution.This result showed that the enviromnental of Kaping Bay dan Pegametan Bay coastal area was competent for mariculturealthough lower compered with control. For the continuity of fisheries aquaculture in Kaping Bay dan Pegametan Bay, Long termeffort in environment conservation is needed better stretegy and action in an integrated and sustainable manners.

Kajian Tingkat Bahaya Erosi Untuk Arahan Konservasi Tanah Pada Berbagai Tipe Penggunaan Lahan Di Kecamatan Merdeka Kabupaten Karo Parlin Hotmartua Putra Pasaribu; Abdul Rauf; Bejo Slamet
JURNAL GEOGRAFI Vol 10, No 1 (2018): JURNAL GEOGRAFI
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jg.v10i1.7898

AbstrakTujuan penelitian ini untuk mengetahui tingkat erosi guna mendapatkan acuan konservasi tanah pada berbagai tipe penggunaan lahan di Kecamatan Merdeka. Penelitian ini menggunakan metode survei analisis prediksi erosi yang dilakukan dengan metode USLE. Hasil penelitian menunjukan bahwa laju erosi tertinggi terdapat pada penggunaan lahan tegalan yaitu sebesar 2.959,018 ton/ha/tahun, sedangkan erosi terendah terdapat pada penggunaan lahan permukiman yaitu sebesar 29,810 ton/ha/tahun. Erosi terbolehkan tertinggi dan terendah terdapat pada penggunaan lahan semak belukar yaitu masing – masing sebesar 36,96 ton/ha/tahun dan 6,81 ton/ha/tahun. Indeks bahaya erosi tertinggi terdapat pada penggunaan lahan Hutan sekunder yaitu sebesar 342 ton/ha/tahun, sedangkan indeks bahaya erosi terendah terdapat pada penggunaan lahan semak belukar yaitu sebesar 1,08 ton/ha/tahun. Ada 3 (tiga) kategori tingkat bahaya erosi di Kecamatan Merdeka yaitu tingkat bahaya erosi level sedang, tinggi, dan sangat tinggi. Teknik konservasi tanah mekanik yang digunakan seperti teras bangku, guludan, saluran penampungan air, saluran pengelak, dan penanaman sejajar kontur sedangkan teknik konservasi vegetatif yaitu seperti tumpang sari, mulsa organik, pengkayaan tanaman keras, pohon serbaguna, kebun campuran, dan tanaman penutup tanah. Kata kunci : Erosi Tanah metode USLE, Indeks Bahaya Erosi, Konservasi Tanah Abstract The purpose of this research is to know the level of erosion to get the reference of soil conservation on various types of land use in Merdeka District. This research used erosion prediction analysis survey method with USLE method. The results showed that the highest erosion rate was found on the using of land, of 2,959,018 tons/ha/ year, while the lowest erosion was found on the use of settlement land of 29,810 tons / ha / year. The highest and lowest permissible erosion was found in the use of scrubland, of 36.96 ton / ha / year and 6.81 tons/ha/ year respectively. The highest erosion hazard index was found in secondary forest land use of 342 tons/ha /year, while the lowest erosion index was 1,08 tons /ha/year. There are 3 (three) categories of erosion hazard in Merdeka District, they are medium, high, and very high erosion level. Mechanical soil conservation techniques are used such as bench terraces, bunds, water reservoirs, ducts, and parallel planting of contours while vegetative conservation techniques such as intercropping, organic mulch, hardwood enrichment, multipurpose trees, mixed gardens, and cover crops. Keywords : Soil Erosion USLE method, Erosion Hazard Index, Soil Conservation

Correlation Between Community Knowledge Level of River Ecosystem Services and Littering Behavior in Belawan Hilir Sub-watershed Ulfa, Mariah; Bejo Slamet; Masrizal Saraan; Harry Kurniawan
Journal of Sylva Indonesiana Vol. 5 No. 02 (2022): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Belawan watershed is one of the watersheds that have a primary role in North Sumatra Province. The flow of the Belawan watershed crosses 2 (two) regencies/cities, i.e., Deli Serdang Regency and Medan City. In more detail, Medan City is located in the Belawan Hilir Sub-watershed. Several main rivers in Medan have been polluted and shallowed, as a result of people's habit of littering the river. People who live around the Belawan watershed have a significant role in the sustainability of the river and its ecosystem services. This study aims to analyze the level of community knowledge of river ecosystem services in the Belawan Hilir sub-watershed and to measure the correlation between the community knowledge level and the behavior of river littering. The respondents were sampled using Simple Random Sampling, while the number of samples was calculated using the Slovin formula. Data was collected through structured interviews by compiling a list of questions (questionnaires). The correlation between community knowledge levels and behavior of river littering was determined using spearman correlation analysis. The community knowledge level was 63% (good category). There was a moderate-positive correlation between the community knowledge level and the behavior of river littering (0.512 correlation coefficient). Community awareness can be increased through online-based socialization using social media or by providing more waste management training programs.

Performance Analysis of Forest Management Unit Region III Kisaran, North Sumatra Province Oktavia, Ade; Bejo Slamet; OK Hasnanda Syahputra
Journal of Sylva Indonesiana Vol. 7 No. 01 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i01.11912

Forest Management Units (FMU) are a form of forestry policy that has become a key instrument in reforming Indonesia's forestry industry. North Sumatra Province has 33 FMU units, comprising 15 Production FMUs and 18 Protection FMUs, all grouped into 16 FMU Regions. This study evaluates forest management performance in the FMU Region III Kisaran. The performance assessment used the Forest Watch Indonesia 2.0 (FWI 2.0) instrument and the Technical Guidelines for Assessing the Effectiveness of Forest Area Management from the Ministry of Environment and Forestry. The FWI 2.0 method is oriented towards performance results, benefits, and impacts. The technical guidelines for assessing the effectiveness of FMU organizations are already oriented toward the results, benefits, and impacts of forest management. Both methods used show that the performance of FMU Region III Kisaran is in the medium category. This research indicates that the selection of FMU performance assessment methods should be tailored to the purpose of the assessment

Prediksi Perubahan Penggunaan Lahan di DAS Deli Hulu Menggunakan Metode Artificial Neural Network Harahap, Ahmad Husein; Satia Negara Lubis; Bejo Slamet
Jurnal Serambi Engineering Vol. 10 No. 1 (2025): Januari 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Human demand for land continues to increase with rapid population growth. This rapid population growth rate will certainly affect land cover changes, which will be increasingly high and may have an impact on land and environmental conversion, especially in the river basin area. One of the catchments that may be affected is the Deli catchment, in particular the Deli Hulu catchment area. The Deli Hulu watershed is geographically located in the administrative area of Deli Serdang Regency and Karo Regency, which have large populations. Therefore, this triggers land use patterns. This study aims to analyse the changes of land cover in Deli Hulu Watershed area in 2013, 2018, 2023 to predict the land cover in 2033. This study uses 6 driving factors, namely distance from roads, distance from rivers, distance from settlements, population density, slope and altitude. This study uses Artificial Neural Network-Markov chain modelling to predict land cover changes in 2033. The results of the study show that the predicted land cover in the Deli Hulu watershed in 2033 is Dryland Forest 3,318 ha (17.16%), Plantations 2,800 ha (14.48%), Settlements 959 ha (4.96%), Dryland Agriculture 11,311 ha (58.49%), Rice Fields 873 ha (4.51%) and Open Land 78 ha (0.40%).

LAND ALLOCATION ANALYSIS OF THE UPHELESS BELAWAN RIVER BASIN (DAS) IN RELATION TO SPATIAL PLANNING Rizki Hany; Abdul Rauf; Bejo Slamet
Multidiciplinary Output Research For Actual and International Issue (MORFAI) Vol. 4 No. 3 (2024): Multidiciplinary Output Research For Actual and International Issue
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54443/morfai.v4i3.3491

Regional development must be balanced and sustainable, particularly in managing the Belawan Watershed, which includes Deli Serdang and Medan. Proper spatial planning is essential to maintaining the upstream and downstream ecosystems and ensuring environmental sustainability. This study aims to analyze the availability of agricultural land in the upper Belawan Watershed to meet human needs. Additionally, it seeks to provide guidance on land allocation within spatial planning and develop sustainable land allocation recommendations for the future. The research methodology employs a qualitative descriptive approach to explain land use and a quantitative approach for presenting numerical data that can be processed using simple calculations. The study concludes that nearly all land in the upper Belawan sub-watershed has been utilized, with only 0.6% remaining as an ecological buffer. The most significant land-use change has been the conversion of production forests into plantations, covering an area of 4,808.70 hectares. Future spatial planning must balance land use with environmental conservation.

Pengabdian Internasional: Pelestarian dan Food Estate Melalui Penanaman Pohon di Ekowisata Beras Basah saragih, Wismaroh Sanniwati; Bejo Slamet; Shiroishi Hidetoshi; Irwan Agusnu Putra; Razali; Lisnawita; Sijabat, Octanina Sari; Dedi Kurniawan
JURNAL ABDIMAS MADUMA Vol. 4 No. 2 (2025): Juli 2025
Publisher : English Lecturers and Teachers Association (ELTA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52622/jam.v4i2.493

Indonesia, as a tropical country, faces significant challenges in preserving its mangrove forests, particularly in the Beras Basah Ecotourism Area, Langkat Regency, which holds high ecological and economic potential. The food estate in mangrove forests aims to develop land for food production, specifically as a source of forage for stingless bees. This community service project aims to preserve the food estate through tree planting in the Beras Basah Ecotourism Area. The methodology includes interviews and discussions, involving 22 participants from Universitas Tjut Nyak Dhien, Tottori University Japan, and Universitas Sumatra Utara. The project results indicate a decline in the stingless bee population due to limited food sources from the mangrove area. Planting fruit trees such as water guava, stone guava, and mango is expected to provide ecological benefits, attract tourists, and support the development of a food estate for stingless bees. With a sustainable approach, this food estate program can serve as a model for the development of mangrove forests as ecotourism areas and strengthen food security in the Beras Basah village, Langkat, North Sumatra. Keywords : Ecotourism; food estate; mangrove; stingless bees

Co-Authors ABDUL RAUF Ade Oktavia, Ade dedi kurniawan Harahap, Ahmad Husein Harry Kurniawan I Made Dharma Jaya Ariawan I W BUDIARSA SUYASA I Wayan Arthana Lisnawita Masrizal Saraan Ni Wayan Widya Astuti Octanina Sari Sijabat OK Hasnanda Syahputra Parlin Hotmartua Putra Pasaribu Putra, Irwan Agusnu Razali Regina Melianawati Rizki Hany Saragih, Wismaroh Sanniwati Satia Negara Lubis Shiroishi Hidetoshi Ulfa, Mariah Wawan Andriyanto

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