Google Apps for Education (GAFE) is a technology is provided and designed for college by promoting the use of information technology and collaboration. One of Google Apps for Education products is Google Classroom being a learning media between for Lecturers and Students to build interactive communication. Interactive communication leads to good feedback in the form of educational transformation from learning source to learner. This is what improves the engagement for the students themselves. By the concept of digital classroom, students no longer just sit passively in the classroom, they are interested in themselves to explore the things offered by technology. Building interactive communication among students need a good strategy. Strategy not only serves as a concept map that shows only direction, but is able to demonstrate operational tactics to achieve the established goals. A teacher or lecturer who does not have a good teaching strategy will not be able to create good communication with students. Building interactive communication among students need a good strategy. Strategy not only serves as a concept map that shows only direction, but is able to demonstrate operational tactics to achieve the established goals. A teacher or lecturer who does not have a good teaching strategy will not be able to create good communication with students.

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Panen parsial adalah metode panen sebagian biomassa udang pada saat kegiatan operasional budidaya sedang berlangsung. Tujuan dari penelitian ini adalah menentukan konseptual model optimalisasi pengelolaan budidaya udang vannamei (L. vannamei) pola intensif berdasarkan prosentase estimasi panen parsial. Penelitian ini dilaksanakan dengan konsep desain kausal ex-post facto selama satu siklus budidaya intensif udang vannamei (L. vannamei). Hasil dari penelitian menunjukkan, selama masa budidaya parameter kualitas air yang meliputi pH, suhu, oksigen terlarut, nitrit, dan nitrat masih berada dalam ambang batas, sedangkan posfat, TAN, dan TOM berada diatas level ambang batas baku mutu untuk budidaya udang intensif. Untuk konsep model simulasi pengelolaan budidaya intensif dari skenario panen non-parsial, parsial 10%, dan parsial 20%. Sistem panen parsial 10% memiliki beberapa keunggulan dibandingkan dua sistem panen lainnya. Yakni, dengan diterapkannya simulasi panen parsial 10% didapatkan nilai efisiensi biomassa panen sebesar 88.08 kg dan efisiensi prosentase survival rate udang sebesar 11% dibandingkan dengan konsep panen parsial 20% atau non-parsial. Sehingga dapat disimpulkan, bahwa untuk konsep model pengelolaan budidaya udang vannamei (L. vannamei) pola intensif yang paling optimal berdasarkan hasil simulasi sistem pemodelan dinamis adalah konsep model budidaya panen parsial 10% dengan pelaksanaan panen parsial pada saat budidaya umur 60 hari.

In intensive shrimp culture, oxygen consumption of shrimp is an important indicator that greatly affects the physiological condition of shrimp as a reared organism. The purpose of this study was to dynamically determine the oxygen consumption of shrimp in intensive culture as well as the variables of water quality and shrimp growth. This research was conducted with the concept of ex-post facto causal design in intensive aquaculture ponds during the shrimp cultivation period. During the shrimp culture period, the rate of oxygen consumption of shrimp is inversely related with the  sigmodial average increase in shrimp body weight. Meanwhile, based on the simulation analysis with the dynamic modeling concept, it is shown that oxygen consumption was linear to the dynamics of  average daily gain and inversely proportional with the increasing rate of shrimp biomass in the ponds. In addition, oxygen consumption rate of shrimp in intensive ponds had a close relationship with water salinity and total organic matter. In conclusion, dynamically, the fluctuation of oxygen consumption rate and average daily gain of shrimp in intensive culture are closely related to the stability of the water quality conditions on the shrimp habitat.

Surface water resource, such as river, is constantly contaminated by domestic and industrial pollutants. In order to properly manage the water resource, a composite index for water quality assessment, such as water quality index (WQI), has been designed to monitor and evaluate the properties of surface water. However, this index is quite subjective in terms of determination of relative weights. A principal component analysis (PCA) can be used to reduce the dimension and subjectivity of water quality variables. The purpose of this study was to implement the use of hybrid PCA and WQI methods to assess and monitor the water quality of the Bengawan Solo River, which is located in Java Island, Indonesia. The result suggested that COD, BOD, TSS, TDS, nitrate, nitrite, and ammonia were the main factors that determine water quality of the Bengawan Solo River. Furthermore, it was revealed that most samples from the river showed water quality status as slightly polluted. In addition to this, the seasonal variation of the PCWI values indicated a significant increase of water pollution in the Bengawan Solo River per year.

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The province of South Kalimantan has the largest peat swamp that is named Danau Panggang Swamp with an area of 5,390.7 Ha. This swamp has ecological, economic and potential functions of a large fishery resource. The purposes of this study are to evaluate the exploitation rate of Snake Head Fish (Channa striata) in Danau Panggang Swamp, by population dynamic analysis using FISAT program of Von Bertalanffy method.  The results showed that the growth pattern of Snake Head Fish (Channa striata) has the tendency to grow negative allometric with 63.4 cm of long infifer (L¥), growth rate (k) 0.15 per year, theoretical age at the time of the fish is equal to 0 (t0) is -1.48257 years. While the natural mortality rate (M) was 0.43, the mortality rate due to catch (F) of 0.69/year and the total mortality rate  (Z) of 1.12/year, and the rate of exploitation value E = 0.62.  These results indicated that the exploitation rate of Head Snake Fish (Channa striata) in Danau Panggang swamp has a tendency to overfishing.

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