Whiteleg shrimp (Litopenaeus vannamei) farming is a major activity in the coastal areas of many tropical countries. To meet the demand in this market, the culture system has expanded using intensive technology, which has resulted in the emission of effluents that threaten the surrounding aquatic ecosystem. Therefore, proper aquaculture management is needed to ensure both economic and ecological benefits. This led to the emergence of eco-green aquaculture. Water quality monitoring is a critical part of aquaculture management and when performed regularly, it yields a large and complex dataset. In this study, the authors aimed to analyse the dynamics of water quality characteristics and the relationships between these variables in whiteleg shrimp ponds in a tropical eco-green aquaculture system from 2020 to 2022. Since the data includes nine parameters and is quite complex, the principal component analysis (PCA) approach was used. This method enables to identify the factors that determine water quality, which will help ensure effective and efficient aquaculture management. Consequently, the water quality variables in the studied area were reduced to five dimensions and salinity, ammonia, and pH were found to be the key factors responsible for the changes in water quality characteristics. Hence, these variables should be the focus of farming management systems.

Penelitian ini bertujuan untuk mengetahui pengaruh suhu air yang berbeda terhadap kecerahan warna dan pertumbuhan ikan hias platy (Xiphophorus maculatus) serta mengetahui suhu yang optimal untuk kecerahan warna dan pertumbuhan ikan hias platy (Xiphophorus maculatus). Penelitian ini menggunakan metode Rancangan Acak Lengkap (RAL), terdiri dari 4 taraf perlakuan dan 3 ulangan. Penelitian ini menggunakan suhu yang berbeda sesuai perlakuan, yaitu (a) 27 °C, (b) 29°C, (c) 31°C (d) kontrol. Pengamatan peningkatan kecerahan warna dilakukan selama 60 hari menggunakan TCF (Toca Color Finder). Pemberian suhu air yang berbeda sangat berpengaruh terhadap kecerahan warna ikan hias platy (Xiphophorus maculatus) tetapi tidak berpengaruh nyata terhadap laju pertumbuhan ikan hias platy (Xiphophorus maculatus) serta suhu yang optimal untuk kecerahan warna ikan hias platy (Xiphophorus maculatus) adalah 27 °C dan 29 °C.

This research to analyze alternative policies could be done to improve the income of seaweed farmers. The method is survey. Analysis of the data used simulation analysis policy. From the results, alternative policies could be done: a). rising labor costs 15%, the addition of one year of experience and the addition of long talus 15%, b). the addition of one year of experience, the addition of one year of education, and increasing the length of the talus 15%, c). rising labor costs 15%, the addition of one year of experience and the addition of one year of education, d). rising labor costs 15% and improving sanitation 5%, and e). the addition of one year of experience, the addition of one year of education and the addition of 5% level of cleanliness. The suggestions: a). to take the policy in a way to rising labor costs 15%, the addition of one year of experience and a 15% increase in length talus together, b). seaweed farmers need to be tested first, in order to determine the level of success of the policy alternatives, c). in the future the policy makers can simulate their own policy by using existing software. Sehingga jumlah stok ikan di laut sebenarnya akan terus berkembang hingga batas daya dukung lingkungannya. Namun, laju penambahan jumlah populasi ikan sangat tergantung pada faktor internal ikan tersebut serta faktor eksternal lingkungannya. Selain dua hal tersebut, faktor manusia sebagai pelaku yang mengambil manfaat dari sumber daya perikanan, akan sangat mempengaruhi. Perilaku manusia dalam mengeksploitasi sumber daya perikanan akan turut mempengaruhi jumlah stok ikan yang berada di laut. Laju pertumbuhan populasi akan terus meningkat dan akan menurun setelah mencapai titik optimum pertumbuhannya, sedangkan perilaku manusia dalam mengekstraksi perikanan akan terus meningkat selama pelaku usaha masih melihat adanya keuntungan dari kegiatan penangkapan ikan. Pada akhirnya akan terjadi

River, as one of the surface water resources, has faced many contaminations due to domestic and industrial activities in its surrounding, and thus routine water quality monitoring is required. This activity yields a large number of water quality characteristics that can be very useful to evaluate the status of river quality status. In this study, we integrated a statistical multivariate analysis such as Principal Component Analysis (PCA) and conventional Water Quality Index (WQI) measure to produce a data-driven composite index for water quality assessment. We implemented this technique to evaluate the status of Brantas River, the largest river in East Java Province-Indonesia, using a long-term dataset collected from 2012 to 2021. The study area was divided into three classes: upstream, midstream, and downstream. Results of the study suggested that the pollution level in the Brantas River fluctuates yearly. Meanwhile, the degree of contamination increased from upstream to downstream.

AbstrakPenelitian ini bertujuan untuk mengetahui distribusi nilai tambah di antara tiga stakeholder utama pada usaha budidaya rumput laut di Provinsi Nusa Tenggara Timur (NTT), yaitu pembudidaya, pedagang dan industri rumput laut telah dilakukan. Data kualitatif dan kuantitatif diperoleh lewat survei, observasi langsung, wawancara dan diskusi kelompok (Focus Group Discussion, FGD). Sampel/unit usaha budidaya rumput laut diambil secara representative dan purposive. Data yang dikumpulkan dianalisis secara deskriptif disertai perhitungan Pay Back Period (PBP), Break Even Point (BEP) dan Benefit Cost ratio (B/C). Hasil menunjukkan nilai PBP = 0,72 yang berarti unit usaha dapat mengembalikan modal dalam 8 bulan. Nilai BEP per unit usaha budidaya rumput laut sebesar Rp. 3.435,77 dan BEP produksi sebesar 2.007,50 kg. Nilai B/C ratio 1.09 menunjukkan bahwa usaha rumput laut di lokasi study layak dilaksanakan. Nilai tambah pada pembudidaya sebesar Rp 3.575/kg, pedagang sebesar Rp 2.175/kg dan industri rumput laut sebesar Rp 41.000/kg. Hasil penelitian ini memberikan kesimpulan bahwa pada tingkat kelayakan usaha budidaya rumput laut di NTT dewasa ini, nilai tambah tertinggi dinikmati oleh industri pengolahan rumput laut, diikuti pembudidaya dan pedagang.AbstractThis study aims to determine the distribution of value added among the three main stakeholders in seaweed farming in the Province of East Nusa Tenggara (NTT), namely the farmers, traders and seaweed industries. The study applied a qualitative and quantitative method through a survey, direct observation, and interviews. Data were representatively and purposively collected. The study used descriptive analysis, focus group discussion, and simple mathematics. Results showed that payback period was 0.72 meaning that the investment could be returned in 8 months; break-even point (BEP) per seaweed culture business unit was IDR. 3,435.77; the break-even point of production was 2,007.50 kg; benefit-cost (B/C) was 1.09 meaning that the seaweed culture was feasible to do. There were 3 successive seaweed marketing channels such as producer, collector, merchant, manufacturer, consumer, or direct delivery from producers to consumers, producer to collecting merchant, big merchant to the consumer. The added value was IDR. 3,575/kg for the seaweed farmer, IDR. 2,175/kg for big merchant, and IDR. 41,000/kg for seaweed industry.