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: Relationship of Water Quality and Production Performance of Vaname Shrimp (Litopenaeus vannamei) at PT Persada Karya Lestari, Pesawaran Regency, Lampung
Abstrak: Ekspor udang menjadi sumber devisa yang lebih besar dibandingkan dengan ekspor produk perikanan lainnya di Indonesia. Potensi udang yang prospektif diikuti juga dengan permasalahan dalam budidaya yang dapat menyebabkan kegagalan panen akibat penurunan kualitas air. Penurunan kualitas air cepat terjadi pada tambak udang sistem intensif dengan padat tebar yang tinggi. Faktor lain yang berpengaruh pada budidaya udang yaitu adanya agen patogen yang dapat menurunkan tingkat kelangsungan hidup udang vaname. Penelitian ini bertujuan untuk menganalisis hubungan kualitas air dan kinerja produksi pada tambak udang vaname (Litopenaeus vannamei). Parameter yang diukur pada penelitian ini adalah average daily growth (ADG), survival rate (SR), feed conversion ratio (FCR), kualitas air, dan indikator kesehatan udang. Hasil uji korelasi menunjukkan bahwa kualitas air memiliki hubungan terhadap kinerja produksi udang vaname. Parameter kualitas air yang berhubungan terhadap ADG secara signifikan adalah pH pagi, total ammonia nitrogen (TAN), alkalinitas bikarbonat, dan rasio total vibrio count (TVC) dan total bacterial count (TBC). Tidak ada parameter kualitas air yang berhubungan signifikan terhadap SR. Parameter kualitas air yang berhubungan secara signifikan terhadap FCR adalah pH pagi, pH siang, suhu pagi, alkalinitas karbonat, alkalinitas bikarbonat, dan rasio total vibrio count (TVC) dan total bacterial count (TBC). Kata kunci: kinerja produksi, kualitas air, udang vaname., Shrimp exports become a greater source of foreign exchange compared to the export of other fishery products in Indonesia. The potential of prospective shrimp is also followed by problems in cultivation that can lead to crop failure due to decreased water quality. Rapid decline in water quality occurs in intensive system shrimp ponds with high density. Another factor that affects shrimp cultivation is the presence of pathogenic agents that can decrease the survival rate of shrimp vaname. This study aims to analyze the relationship of water quality and production performance in shrimp ponds vaname (Litopenaeus vannamei). The parameters measured in this study are average daily growth (ADG), survival rate (SR), feed conversion ratio (FCR), water quality, and shrimp health indicators. The results of the correlation test showed that water quality has a relationship to the production performance of vaname shrimp. The water quality parameters associated with ADG are significantly the morning pH, total nitrogen ammonia (TAN), bicarbonate alkalinity, and the ratio of total vibrio count (TVC) and total bacterial count (TBC). There are no water quality parameters significantly related to SR. Water quality parameters significantly related to FCR are morning pH, afternoon pH, morning temperature, carbonate alkalinity, bicarbonate alkalinity, and total vibrio count (TVC) and total bacterial count (TBC) ratio. Keywords: production performance, shrimp vaname, water quality.
Keyword: production performance, shrimp vaname, 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