Judul: Analisis Karakteristik Kualitas Air dan Korelasinya Terhadap Kinerja Produksi Udang Vaname (Litopenaeus vannamei) di PT Biru Laut Nusantara, Pangandaran, Jawa Barat
Abstrak: Pengelolaan kualitas air menjadi salah satu faktor keberhasilan dalam budidaya udang vaname. Pengelolaan kualitas air memegang peranan penting terhadap pertumbuhan dan ketahanan terhadap penyakit. Penelitian ini dilakukan dengan melakukan pengamatan secara langsung di tambak udang vaname pada tambak pemeliharaan, tandon air, dan IPAL. Tambak pemeliharaan memiliki luasan 3025 m2 berbentuk persegi dengan konstruksi HDPE (High Density Polyethylene) dengan padat tebar 100 ekor/m2 . Parameter kualitas air yang diamati meliputi kecerahan, suhu, salinitas, pH, oksigen terlarut, kesadahan Ca, kesadahan Mg, total alkalinitas, amonia (NH3), nitrit (NO2), nitrat (NO3), Total Bakteri Count (TBC), Total Green Vibrio (TGV), Total Yellow Vibrio (TYV), Total Vibrio Count (TVC), dan Plankton. Parameter tersebut kemudian dikorelasikan dengan Survival Rate (SR), Average Daily Growth (ADG), dan Feed Conversion Ratio (FCR) serta dilakukan clustering antar tambak berdasarkan kemiripan karakteristik parameter kualitas air. Penelitian dilakukan pada DOC 40 sampai DOC 82. Selama penelitian berlangsung dilakukan sampling setiap 7 hari sekali untung menentukan ADG, SR, serta FCR. Kualitas air berkorelasi terhadap parameter tersebut, namun hanya parameter amonia (NH3), Total Yellow Vibrio (TYV), dan Total Vibrio Count (TVC) berpengaruh signifikan terhadap ADG. Karakterstick kualitas air pada petak pemeliharaan KBU 5 sudah menyerupai kualitas air pada KPL 3 ketika memasuki masa pemeliharaan 40 hari, Water quality management is one of the success factors in vaname shrimp farming. Water quality management plays an important role in growth and disease resistance. This study was conducted by making direct observations in vaname shrimp ponds on the maintenance ponds, water reservoirs, and WWTP. The rearing pond has an area of 3025 m2 square with HDPE (High Density Polyethylene) construction with a stocking density of 100 fish/m2 . Water quality parameters observed included brightness, temperature, salinity, pH, dissolved oxygen, Ca hardness, Mg hardness, total alkalinity, ammonia (NH3), nitrite (NO2), nitrate (NO3), Total Bacteria Count (TBC), Total Green Vibrio (TGV), Total Yellow Vibrio (TYV), Total Vibrio Count (TVC), and Plankton. These parameters were then correlated with Survival Rate (SR), Average Daily Growth (ADG), and Feed Conversion Ratio (FCR) and clustering between ponds based on similar characteristics of water quality parameters. The study was conducted from DOC 40 to DOC 82. During the study, sampling was conducted every 7 days to determine ADG, SR, and FCR. Water quality was correlated with these parameters, but only ammonia (NH3), Total Yellow Vibrio (TYV), and Total Vibrio Count (TVC) had a significant effect on ADG. The character of water quality in KBU 5 rearing plots already resembled the water quality in KPL 3 when entering the 40-day rearing period
Keyword: aquaculture, Litopenaues vannamei, production

Judul: Korelasi Kualitas Air Terhadap Kinerja Produksi Udang Vaname di PT Surya Windu Kartika, Banyuwangi, Jawa Timur
Abstrak: Udang vaname (Litopenaeus vannamei) merupakan salah satu komoditas unggulan yang banyak dibudidayakan. Penelitian ini bertujuan untuk menganalisis korelasi antara kualitas air terhadap kinerja produksi udang vaname secara deskriptif. Penelitian dilakukan dengan menggunakan 5 petak dengan padat tebar 116-130 ekor m-2. Metode yang digunakan pada penelitian ini adalah analisis principal component analysis (PCA) dan uji korelasi. Hasil uji korelasi yang diperoleh yaitu survival rate (SR) berkorelasi kuat hingga sangat kuat dengan kecerahan pagi, salinitas, suhu pagi dan siang, nitrat (NO3), fosfat (PO4), total organic matter (TOM), total vibrio count (TVC), dan total green vibrio (TGV). Average daily growth (ADG) berkorelasi kuat hingga sangat kuat dengan kecerahan dan pH pagi, salinitas, dissolved oxygen (DO) siang dan malam, amonium (NH4), nitrit (NO2), nitrat, TOM, TVC, total bacteria count (TBC), total yellow vibrio (TYV), dan TGV. Feed conversion ratio (FCR) berkorelasi kuat dengan kecerahan pagi dan siang, pH pagi, salinitas, suhu pagi dan siang, DO siang dan malam, nitrat, TOM, alkalinitas total, TVC, TBC, TYV, dan TGV. Hasil korelasi tersebut menunjukkan bahwa setiap peningkatan maupun penurunan kadar parameter kualitas air mempengaruhi SR, ADG, dan FCR., Vaname shrimp (Litopenaeus vannamei) is one of the leading commodities that are widely cultivated. This study aims to analyze the correlation between water quality and vaname shrimp production performance descriptively. The research was conducted using 5 plots with a stocking density of 116-130 shrimp m-2. The method used in this research is principal component analysis (PCA) and correlation test. The correlation test results obtained were survival rate (SR) correlated strongly to very strongly with morning brightness, salinity, morning and afternoon temperatures, nitrate (NO3), phosphate (PO4), total organic matter (TOM), total vibrio count (TVC), and total green vibrio (TGV). Average daily growth (ADG) was strongly to very strongly correlated with morning brightness and pH, salinity, day and night dissolved oxygen (DO), ammonium (NH4), nitrite (NO2), nitrate, TOM, TVC, total bacteria count (TBC), total yellow vibrio (TYV), and TGV. Feed conversion ratio (FCR) was strongly correlated with morning and afternoon brightness, morning pH, salinity, morning and afternoon temperature, afternoon and evening DO, nitrate, TOM, total alkalinity, TVC, TBC, TYV, and TGV. The correlation results showed that each increase or decrease in water quality parameter levels affected SR, ADG, and FCR.
Keyword: correlation, cultivation, production performance, vannamei shrimp, water quality

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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