Increasing type and number of human activities will impact on decreasing quality of water. Therefore, it is necessary to determine the water quality status of Rawapening Lake regularly to ensure that the water quality remains in its natural condition. The purposes of this study were to evaluate the water quality status and class of Rawapening Lake. The survey was done in the lake during dry season for 3 months (July to September 2016). Water sampling conducted in seven locations. The measured variables were all parameters as specified in Government Regulation No. 82 of 2001. To determine the water quality status was using storet methods. Determination of the water class was by comparing the concentration of all parameters with the standard. Observations indicated that the Rawapening Lake water quality status was in heavily polluted. There were eight parameters exceeding the standard i.e. TSS, BOD, COD, total phosphor and total coliform, Cd and Pb, and H2S. Therefore, it is necessary to decrease them through activities such as not throwing rubbish into the lake, lifting biomass of water hyacinth, picking up peat soil sediments, using environmentally friendly fuels, reducing fertilizers and pellet, reforesting critical lands, limiting mining activities, banning waste disposal directly to rivers.

Segara Anakan Cilacap waters consist of lagoon and riverine areas with mangrove forests. The mixing of inland and marine waters affects the plankton community. The research objectives were to describe plankton species richness and abundance, water quality during tides, and to analyze the relationship among them. The research method was a survey with a purposive sampling technique. Sampling was taken from five stations, four times in a dry season, on a spring tide when the maximum tidal range occurs. The water quality parameters consisted of temperature, current velocity, light penetration, pH, dissolved oxygen, free carbon dioxide, and salinity. The results showed that plankton species richness was the highest during the new moon at Station 3 near Motean and dominated by sea waters from Divisio Chrysophyta, such as Chaetoceros decipiens. The next taxa were Phylum Arthropoda, Divisio Cyanophyta, Divisio Chlorophyta, Phylum Euglenozoa, and Phylum Cnidaria. The plankton abundance was the highest during the new moon at Station 1 and dominated by sea waters from Divisio Chrysophyta, such as Chaetoceros. Water quality during the maximum tidal range in the new moon was better than the full moon at Station 1. In general, the highest plankton abundance was related to better water quality at Station 1.

Nutrients are substances that are used by living organisms in the growth and survival of organisms. On the basis of this background, the aim of this study was to assess the concentration of nutrients (macro and micronutrients) and chlorophyll in the Menjer lake and to examine the relationship between nutrient concentration and algal biomass to identify the determinants of algal development in tropical lakes (Menjer Lake Wonosobo, Indonesia). The research was conducted using a survey method at Menjer Lake Wonosobo. Observations and sampling were carried out 3 times with intervals of 1 month at 7 locations in the photic zone. The concentrations of macronutrients and micronutrients in the Menjer Lake were spatially even in all locations and the temporally slightly increased concentrations were relatively the same during the measurement period. The Cu, NO 2 , Si, and Na macronutrients are the determining factors for algal blooming in Menjer Lake Wonosobo. The effect of Cu, NO 2 and Si concentrations was inversely related to the algal abundance, while the Ca, Na and Mo concentrations were in line with the abundance of algae.

Phytoplankton is the primary producer whose existence depends not only on the nutrient. The eastern part of Segara Anakan waters experienced changes where the decline in quality which received input from organic and inorganic wastes and residential, industrial and factory wastes of Holcim and Pertamina factories. The purpose of this research is to study the water quality and to study the relationship between water quality and abundance of phytoplankton at the eastern part of Segara Anakan. The result showed that Water quality in Segara Anakan waters in the eastern part of Cilacap consists of several parameters that beyond the quality standards according to the Keputusan Menteri Lingkungan Hidup No. 51 of 2004 such as pH, Nitrate, Ammonia, Phosphate, and TSS. Water temperature is a physical factor which has a strong negative correlation with the abundance of phytoplankton, followed by TSS as a physical factor which has a positive correlation. The chemical factor which has a positive correlation with abundance are TDS, Nitrite and pH, followed by Phosphate, Salinity, Ammonia, and Nitrate which has a negative correlation with the abundance of phytoplankton. Key Words: Environmental factor, phytoplankton, Segara Anakan, Spatial variation, temporal variation.

Ketahanan pangan merupakan salah satu faktor penentu kesejahteraan masyarakat khususnya di pedesaan. Upaya untuk mencapai kondisi tersebut perlu adanya kerjasama antar berbagai elemen, salah satunya peran perguruan tinggi melalui kegiatan pengabdian masyarakat. IPTEKS tentang diversifikasi hasil olahan ikan lele, telah dilakukan di Desa Kaliwangi Kecamatan Purwojati Kabupaten Banyumas. Kegiatan tersebut bertujuan untuk meningkatkan pengetahuan dan kemampuan ibu-ibu anggota PKK dan para remaja putri Desa Kaliwangi dalam mengolah makanan yang bersumber dari bahan baku yang sama menjadi beberapa tampilan yang berbeda; memberikan ketrampilan dalam penanganan pasca panen, khususnya pengolahan ikan lele menjadi bahan olahan siap saji yang sehat, bergizi, praktis serta ekonomis; memberikan ketrampilan kreatif pada ibu-ibu anggota PKK dan para remaja putri dalam membuat nugget dan kaki naga lele dan, memberikan ketrampilan dalam pengemasan produk olahan ikan (khususnya pembuatan nugget dan kaki naga). Metode yang digunakan meliputi pembekalan materi melalui penyuluhan/ceramah, praktek dan demostrasi plot (demplot), selanjutnya dilakukan monitoring dan evaluasi. Selama kegiatan praktek dilakukan pendampingan untuk membantu khalayak sasaran menghasilkan produk yang bagus. Hasil evaluasi menunjukkan adanya peningkatan pengetahuan, pemahaman dan ketrampilan di dalam mengolah ikan lele sebagai produk olahan baru berupa nugget dan kaki naga yang disukai dan bermanfaat bagi kesehatan serta dapat digunakan sebagai salah satu peluang usaha.