Pertambangan batubara di Indonesia banyak dilakukan secara terbuka(surface mining). Penambangan batubara yang dilakukan secara terbuka akanmelepaskan asam sulfat dan mendorong terjadinya oksidasi mineral sulfida.Proses ini selanjutnya akan menghasilkan limbah berupa air asam tambang (AAT) dan mengakibatkan tingginya akumulasi logam berat pada tanah dan air. Air asamtambang (AAT) memiliki nilai …
Besarnya pelepasan yang melalui bawah pintu air serta karakteristik profil aliran yang terbentuk setelah melewati pintu ini dapat dihitung dan dianalisa untuk kemudian diramalkan bentuk umum dari profil aliran yang terjadi. Analisa profil aliran ini menjadi penting adanya terutama dalam perancangan saluran. Tujuan dari penelitian ini adalah menentukan besarnya nilai pelepasan ( debit ) yang kel…
Pada daerah dataran tinggi sering terjadi erosi yang disebabkan oleh tergerusnya tanah akibat energi kenetik hujandan pengaruh lainnya seperti jenis kepekaan tanah, penggunaan lahan, serta panjang dan kemiringan lereng. Tujuan dari penelitian ini adalah untuk menghitung indek erosivitas serta mengetahui besarnya erosi pada Sub DAS Lematang Hulu, yang merupakan wilayah perbukitan di Sumatera Sel…
Channel planning by using the Manning formula Manning roughness coefficient (n) as one of the parameters that are influenced by the surface roughness of the channel. If the channel is planned to have a surface roughness varies from one side to the other side, also known as composite channel, it would require the equivalent Manning roughness coefficient (ne). This study aims to identify the effe…
Kehamilan yang dialami oleh wanita akan menciptakan berbagai perubahan pada aspek fisiologis, psikologis hingga aspek sosial. Berdasarkan data WHO menyatakan bahwa beberapa negara berkembang di dunia berisiko tinggi terjadinya gangguan kecemasan pada ibu hamil dan ibu pasca persalina. Penelitian ini bertujuan untuk mengetahui hubungan dukungan keluarga dengan tingkat kecemasan ibu hamil dalam m…
Penambangan batubara PT Kalimantan Prima Persada Jobsite PELH dilakukan dengan metode tambang terbuka. Metode penambangan secara tambang terbuka akan menghasilkan cekungan yang apabila terjadi hujan akan terisi air. Pada pit timur asta PT Kalimantan Prima Persada Jobsite PELH terdapat sebuah void berisi air yang berada pada sisi barat pit timur asta. Void tersebut masuk kedalam boundary pit pad…
The polyculture system is an aquaculture system that combines two or more types of fish in one rearing container. Fish rearing can also be integrated with plants or vegetables, known as aquaponics systems. Determining the stocking density and selected fish to be kept in polyculture is essential. This study aims to determine the best stocking density of climbing perch cultivated in polyculture w…
Catfish (Clarias gariepinus) is a type of freshwater fish superior in increasing fish production and consumption of fishery commodities. The obstacle in carrying out fish cultivation is the presence of diseases in fish, such as Motile Aeromonas Septicemia (MAS), caused by the bacterium Aeromonas hydrophila. The experiment used a completely randomized design (CRD) consisting of controls and thre…
One of the obstacles in fish aquaculture activities is the being of disease attacks. One of the commonly diseases that attack fresh water is motile aeromonas septicemia caused by Aeromonas hydrophila. Nile tilapia is one of the types of freshwater fish that is most favoured by the community. Efforts to prevent Aeromonas hydrophila attacks by utilizing natural ingredients such as Peperomia pellu…
One of the obstacles in the production process is the high cost of feed which ranges from 60-70% of the total production costs. The main ingredient of vegetable protein sources in fish feed formulations is soybean meal. However, the availability of soybean meal is still dependent on imports, so that efforts are needed to develop feed made from alternative raw materials that are easily available…
Malay combtail (Belontia hasselti, Cuvier 1831) is one of the freshwater fish species inhabiting the floodplain. The species has the prospect of becoming an aquaculture commodity as an ornamental fish. This study aimed to analyze the sexual dimorphism, reproductive biology, and growth pattern of B. hasselti. Sample collection was conducted in the Kelekar Floodplain area, Ogan Ilir Regency. Fish…
Cadmium is the most common heavy metal found in waters after lead (Pb). It can impact the function of fish organs and cause tissue damage in the gills, liver, kidneys, pancreas, and meat, finally impacting the health of the human body that consumes it. The climbing perch is a susceptible fish that may be exposed to cadmium contamination (Cd). This study aimed to perform an acute toxicity test a…
Gouramy (Osphronemus gouramy Lac.) is a type of freshwater fish native to Indonesia which is quite widely cultivated and has high production rates in South Sumatra. However, the growth and feed efficiency of gouramy are still relatively low it needs to be increased by providing optimal feed and cultivation systems. Feeding combination of commercial feed and azolla in the biofloc system is tough…
Fry is a phase that is very vulnerable to death. One of the things that determine it the most is the period of feeding with the appropriate type of feed so that it can support the growth and survival rate of fry java combtail. This study was designed to determine the best period of feeding and the type of feed for the growth and survival of fry java combtail. This research would be carried out …
Catfish production continues to increase, so it is necessary to make efforts to maintain this achievement, one of which is the development of intensive cultivation technology with biofloc system. The biofloc system can save feed, where the problem faced by fish farmers is that they still rely on commercial feeds which are relatively expensive. Efforts that can be made to save on feed costs are …
Sungai-sungai di Indonesia 30 tahun terakhir ini mengalami peningkatan pembangunan fisik yang relatif cepat Pembangunan fisik tersebut misalnya pembuatan sudetan-sudetan, pelurusan-pelurusan, pembuatan tanggul sisi, pembetonan tebing naik baik pada sungai besar maupun kecil. Pelurusan akan menyebabkan terjadinya peningkatan kecepatan air menuju hilir. (Agus Maryono, 2008). Penelitian dilakukan …
Feed is an important component in aquaculture. The high price of feed is one of the obstacles in conducting fish farming. One way to reduce feed costs is by using artificial feed, but the price of soybeans as a source of protein in artificial feed formulations is relatively high because they are imported raw materials. Therefore, alternative feed ingredients are needed to substitute soybeans su…
One of the disease in pangasius catfish is the pathogenic bacteria Aeromonas hydrophila which causes Motile Aeromonas septicemia (MAS) or known as red spot disease. This study aimed to determine the concentration for treatments of pangasius catfish (Pangasius sp.) infected with Aeromonas hydrophila bacteria using gambier (Uncaria gambier Roxb) sap solution. This research design used a completel…