The research location is the northern part of the Basin of Limboto Lake; the focus of the research is the limestone outcrop with 24 meter thickness in Yosonegoro area. The purpose of the study is to find out facies, standard microfacies and depositional environment on Limboto limestone. The research method carried out consisted of three methods namely the measured section, petrographic analysis and biostratigraphy analysis. The limestone facies in the Yosonegoro area consist of two facies. Then, based on sedimentary structure, composition, color, precipitation texture, terrestrial origin components and the organism content, the two facies can divided into three different microfacies. Paleobathymetry shows a deepening from the middle shelf-upper slope to the upper slopelower slope due to the sea level rise. Compilation of standard microfacies and paleobathymetry types shows changes in depositional environment from the slope environment to the toe of slope environment. The result of this study will be led researchers to propose the name of the new formation, which is the Limboto Limestone Formation according to specific location and characteristics from the previous formation name of the Clastic Limestone Formation.

The location of the study area is surging hills in Bongomene area, Gorontalo, Indonesia. In this study, a geological survey and sampling were taken, and then an analysis of the content of benthic foraminifera was performed in each sample. The study aims to discover the species of benthic foraminifera fossils and to determine the paleobathymetry to the studied regions. The results of the analysis contained seven fossils species, namely Ammomassilina alveoliniformis, Stelligerum astrononion, Haynesia germanica, Nonion fabum, Praeglobobulimina ovata, Rhabdammina discreata and Saccorhiza ramosa. Based on the content of benthic foraminifera fossils, paleobathymetry is determined as Middle Shelf to Outer Shelf in Bongomeme 1, while in Bongomeme 2 and 3 is Middle Shelf.

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Abstract. This paper presents an improvement model of the effective moment of inertia to predict the short term deflection of reinforced lightweight concrete beam. The models were developed using 9 beams of reinforced pumicelightweight concrete tested under two symmetrical-point loads. The presence of steel reinforcement in the beam was taken into consideration in the developed model. The models were verified by test carried out on other 9 beams. Those beams subjected to various-point loads and compressive strength. The results of investigation revealed that crack moment of inertia increased with the increased tensile reinforcement ratio. Thus, the reinforcement ratio significantly affects the value of effective moment of inertia of reinforced lightweight concrete beam. All the beam test results produced considerable deflection in comparison to that obtained using current Codes either ACI or SNI. The proposed model demonstrated a good agreement to the experimental results and in some cases have similar trend to that of the ACI or SNI prediction.

AbstrakPemanfaatan aliran sungai menjadi lahan budidaya ikan air tawar  sangat digemari warga sekitar bantaran  sungai.  Masyarakat disekitar aliran sungai Je’neberang telah memanfaatkan aliran sungai menjadi lahan budidaya system keramba jaring apung (KJA) dengan membudidayakan ikan air tawar seperti ikan Lele, ikan Nila dan ikan Patin. Permintaan ikan Lele, Nila dan Patin sangat tinggi, namun dilapangan produksi ikan belum mampu memenuhi kebutuhan pasar. Beberapa faktor penyebab rendahnya produksi adalah lambatnya pertumbuhan dan sintasan  akibat kurangnya nutrisi ikan budidaya  sebagai dampak dari meminimalisirkan penggunaan pakan komersial yang relatif mahal bagi pembudidaya.  Penggunaan pakan buatan yang berkualitas tinggi dengan memanfaatkan limbah organik rumah tangga  sangat membantu untuk menyelesaikan bebarapa permasalahan pembudidaya, khusunya pada kelompok pembudidaya ikan “Jenber” di Kota Makassar. Berdasarkan hasil kegiatan yang dilakukan diketahui bahwa tehnik budidaya ikan air tawar khususnya ikan Lele, Nila, dan Patin dilakukan masyarakat dengan memanfaatkan aliran sungai dengan cara yang sederhana tanpa pemanfaatan teknologi tepat guna.  Melalui kegiatan penyuluhan ini, kelompok mitra menjadi mengetahui tehnik pembuatan pakan dengan bahan dasar limbah rumah tangga yang tidak bernilai menjadi pakan ikan yang  bernilai tinggi serta ramah lingkungan. Saran yang  diberikan  untuk kegiatan selanjutnya adalah pendampingan yang intensif agar kelompok budidaya ikan  dapat konsisten menerapkan metode budidaya  ikan yang ramah lingkungan, murah dan efektif, seperti penggunaan pakan dari limbah limbah organik rumah tangga.Kata Kunci : Pakan ikan,ramah lingkungan, budidaya, sungai.AbstractThe Utilization of river flow into freshwater fish cultivation is very popular among residents around the riverbanks. Communities around the Je’ neberang river have used the river to become a floating net cage system (KJA) cultivation by cultivating freshwater fish such as Catfish, Tilapia and Silver Catfish. The demand for Catfish, Tilapia and Silver Catfish are very high, but the fish production field has not been able to meet the market needs. Some of the factors causing the low production are slow growth and low survival rate due to the lack of nutrition for cultured fish as a result of minimizing the use of commercial feed which is relatively expensive for farmers. The use of high-quality artificial feed by utilizing household organic waste is beneficial to solve some problems for farmers, especially in the “Jenber” fish farmer group in Makassar City. Based on the results of the activities carried out, it is known that freshwater fish cultivation techniques, especially Catfish, Tilapia, and Silver Catfish are carried out by the community by utilizing river flow efficiently without the use of appropriate technology. Through this outreach activity, the partner groups learned about the technique of making feed with non-valuable household waste as high value and environmentally friendly fish feed. Suggestions given for further activities are intensive assistance so that fish farming groups can consistently implement environmentally friendly, inexpensive and effective fish farming methods, such as the use of feed from household organic waste.Keyword : fish feed, environmentally friendly, cultivation, the river