Judul: Dinamika Kualitas Air dan Kinerja Produksi Litopenaeus vannamei pada Padat Tebar yang Berbeda dengan Teknologi Millenial Shrimp Farming.
Abstrak: Vaname shrimp Litopenaeus vannamei is the main commodity in Indonesian fishery exports. The latest technology in culture of vaname shrimp, namely Millennial Shrimp Farming (MSF) is adequate, but has not been supported by stocking density. The imbalance between the stocking density and the aquatic environment is often a problem. The accuracy of stocking density and suitability of water quality need to be known so that the culture takes optimally and the shrimp is as desired. This study aims to analyze the dynamics of water quality and production performance of vaname shrimp at different stocking densities with MSF technology. A total of two treatments were stocking density of 300 fry m-2 (BL) and 400 fry m-2 (BP) and each treatment was repeated five times. The results showed that the water quality and production performance of vaname shrimp with MSF technology were not significantly different (ρ> 0,05). The water quality of the two treatments was not much different including pH 7,08-7,78, DO 3.17-7.31 ppm, temperature 24,18-29,84oC, salinity 3,60-28,20 ppt, ammonia <0,01 ppm, ammonium and TAN <4 ppm, nitrite <8,70 ppm, nitrate <43,32 ppm, TOM <68,55 ppm and alkalinity 108,20-149,80 ppm and the abundance of plankton was dominated by green algae and diatoms. Production performance at a stocking density of 400 fry m-2 (BP) was more optimal with MBW 20,75 g head-1, ADG 0,23 g head-1 day-1, FCR 1,47; SR 92% and PE 68%., Udang vaname Litopenaeus vannamei menjadi komoditas utama dalam ekspor perikanan Indonesia. Teknologi terbaru dalam budidaya udang vaname yaitu Millenial Shrimp Farming (MSF) sudah memadai, namun belum didukung oleh penebaran. Ketidakseimbangan padat tebar benur dengan lingkungan perairan kerap menjadi permasalahan. Ketepatan padat tebar dan kesesuaian kualitas air perlu diketahui agar budidaya berlangsung optimal dan udang sesuai dengan yang diinginkan. Penelitian ini bertujuan menganalisis dinamika kualitas perairan dan kinerja produksi udang vaname pada padat tebar yang berbeda dengan teknologi MSF. Sebanyak dua perlakuan yaitu padat tebar 300 benur m-2 (BL) dan 400 benur m-2 (BP) serta setiap perlakuan dilakukan lima kali ulangan. Hasil penelitian menunjukkan kualitas air dan kinerja produksi udang vaname dengan teknologi MSF tidak berbeda nyata (ρ>0,05). Kualitas air kedua perlakuan tidak jauh berbeda di antaranya pH 7,08-7,78, DO 3,17-7,31 mg L-1, suhu 24,18-29,84 oC, salinitas 3,60-28,20 g L-1, amonia <0,01 mg L-1, amonium dan TAN <4 mg L-1, nitrit <8,70 mg L-1, nitrat <43,32 mg L-1, TOM <68,55 mg L-1 dan alkalinitas 108,20-149,80 mg L-1 serta kelimpahan plankton didominasi green algae dan diatom. Kinerja produksi pada padat tebar 400 benur m-2 (BP) lebih optimal dengan MBW 20,75 g ekor-1, ADG 0,23 g ekor-1 hari-1, FCR 1,47; SR 92% dan EP 68%.
Keyword: msf, performance, stocking, vaname, water quality

Judul: Relation of Water Quality and Production Performance of Vaname Shrimp (Litopenaeus vannamei) with Intensive System at BPBAP Takalar, South Sulawesi
Abstrak: Udang vaname (Litopenaeus vannamei) memiliki lonjakan permintaan baik dari pasar lokal maupun pasar ekspor, dengan sistem budidaya udang vaname pada saat ini yaitu sistem intensif hingga supra intensif. Tingginya permintaan dan produksi udang sejalan dengan permasalahan yaitu penurunan kualitas air. Hubungan kualitas air sangat berpengaruh terhadap kinerja produksi sehingga perlu diperhatikan dan dijaga keseimbangannya. Penelitian ini bertujuan untuk menganalisis kaitan kualitas air terhadap kinerja produksi pada tambak Divisi Pembesaran Udang Vaname (Litopenaeus vannamei) di BPBAP Takalar, Sulawesi Selatan. Penelitian ini merupakan penelitian non eksperimental menggunakan data sekunder. Prosedur penelitian melakukan observasi lapangan, wawancara, dan menganalisis parameter kualitas air dengan kinerja produksi udang vaname. Parameter yang diamati yaitu laju pertumbuhan harian (LPH), kelangsungan hidup (KH), rasio konversi pakan (RKP), dan kualitas air. Analisis data dilakukan secara deskriptif dengan pemaparan grafik dan uji statistik principal component analysis (PCA) serta uji korelasi. Hasil analisis deskriptif menunjukan nilai LPH, KH, dan RKP mengalami fluktuasi. Berdasarkan hasil uji PCA kualitas air yang memiliki hubungan terhadap LPH yaitu DO pagi, nitrit, nitrat, dan phospat sedangkan kinerja produksi KH dan RKP yang memiliki hubungan dengan alkalinitas, bahan organik, dan suhu pagi. Berdasarkan hasil uji korelasi kualitas air terhadap kinerja produksi dengan koefisien korelasi dan Sig(<0,05) dihasilkan LPH memiliki korelasi terhadap suhu sore dengan nilai (-0,045) (0,004), DO sore (0,669) (0,00), kecerahan (0,439) (0,005), nitrit (0,398) (0,011), nitrat (0,357) (0,024), dan bahan organic (-0,333) (0,036). Kualitas air yang memiliki pengaruh signifikan terhadap KH yaitu suhu pagi dengan nilai (0,340) (0,032) dan phospat (-0,343) (0,030). Hasil uji korelasi kualitas air terhadap RKP yang signifikan yaitu suhu pagi dengan nilai (0,324) (0,041) dan kecerahan (0,316) (0,047)., Vannamei shrimp (Litopenaeus vannamei) has a surge in demand from both the local and export markets, with the current vaname shrimp cultivation system, namely the intensive to supra intensive system. The high demand and production of shrimp is in line with the problem of decreasing water quality. Water quality correlation of aquaculture environment have impact to production performance so that it needs to be considered and maintained in balance. This study aims to analyze the relationship between water quality and production performance in the Vaname Shrimp (Litopenaeus vannamei) rearing pond at BPBAP Takalar, South Sulawesi. This research is a non-experimental research using secondary data. The research procedure was conducting field observations, interviews, and analyzing water quality parameters with the production performance of vaname shrimp. Parameters observed were average daily growth (ADG), survival rate (SR), feed conversion ratio (FCR), and water quality. Data analysis was carried out descriptively with graphic presentation and principal component analysis (PCA) statistical tests and correlation tests. The results of the descriptive analysis showed that the ADG, SR, and FCR values fluctuated. Based on the results of the PCA test, water quality that has a relationship with ADG is DO, nitrite, nitrate, and phosphate while the production performance of SR and FCR have a relationship with alkalinity, organic matter, and morning temperature. Based on the results of the correlation test of water quality on production performance with a correlation coefficient and Sig (<0.05) the resulting LPH has a correlation with afternoon temperature with
Keyword: production performance, water quality, vaname shrimp

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