Judul: Korelasi Kualitas Air dan Kinerja Produksi pada Pembesaran Udang Vaname (Litopenaeus vannamei) di PT Dewi Laut Aquaculture, Garut
Abstrak: Udang vaname (Litopenaeus vannamei) merupakan komoditas unggulan perikanan yang bernilai ekonomis tinggi. Salah satu faktor yang mempengaruhi keberhasilan budidaya udang vaname yaitu faktor kualitas air. Penelitian ini bertujuan untuk menghitung korelasi kualitas air selama pemeliharaan dan kinerja produksi udang vaname di Dewi Laut Aquaculture, Garut, Jawa Barat. Penelitian ini dilakukan dengan pengamatan secara langsung di tambak udang vaname pada tambak pemeliharaan dengan sistem intensif. Metode yang digunakan pada penelitian ini adalah analisis principal component analysis (PCA) dan uji korelasi. Parameter penelitian yang diamati adalah kualitas air (kecerahan, pH, DO, suhu, salinitas, amonia, nitrit, nitrat, alkalinitas, kesadahan, TOM, plankton, dan bakteri), survival rate (SR), average daily growth (ADG), feed conversion ratio (FCR). Hasil uji korelasi menunjukkan parameter nitrit, dan nitrat menjadi parameter yang paling banyak berkorelasi dengan parameter kinerja produksi. Parameter nitrit - 0,414 dan nitrat -0,496 berkorelasi negatif sedang dengan parameter SR. Parameter nitrit dan nitrat sama-sama berkorelasi negatif sedang dengan ADG yaitu masing masing sebesar -0,416 dan -0,424. Sementara itu, parameter nitrit dan nitrat berkorelasi positif sedang dengan parameter FCR yaitu masing-masing sebesar 0,419 dan 0,427., Whiteleg shrimp (Litopenaeus vannamei) is a leading fishery commodity with high economic value. One of the factors that affect the success of vannamei shrimp farming is the water quality factor. This study aims to calculate the correlation of water quality during rearing and production performance of vannamei shrimp in Dewi Laut Aquaculture, Garut, West Java. This study was conducted by direct observation in vannamei shrimp ponds in ponds with intensive system maintenance. The method used in this study was principal component analysis (PCA) and correlation test. The research parameters observed were water quality (brightness, pH, DO, temperature, salinity, ammonia, nitrite, nitrate, alkalinity, hardness, TOM, plankton, and bacteria), survival rate (SR), average daily growth (ADG), feed conversion ratio (FCR). Correlation test results showed that nitrite and nitrate parameters were the most correlated with production performance parameters. Nitrite -0.414 and nitrate -0.496 were moderately negatively correlated with SR parameters. The nitrite and nitrate parameters were both moderately negatively correlated with ADG at -0.416 and -0.424, respectively. Meanwhile, the nitrite and nitrate parameters were moderately positively correlated with the FCR parameter at 0.419 and 0.427.
Keyword: correlation, pond, production performance, shrimp vannamei, water  quality

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: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology