Judul: Feasibility Study and the Development Strategy of Nil Tilapia Farmer Groups in Gemah Parahiyangan Karawang District
Abstrak: Recently nil tilapia (Oreochromisniloticus) cultures are being practiced in floating net cages, brackish water ponds and running water ponds. Rapid development of nil tilapia culture area in Bekasi, Karawang and Purwakarta Districts required a lot of nil tilapia fries. In parallel, nil tilapia hatcheries are developed in many areas, especially the small scale hatcheries. Nil tilapia hatcheries are very profitable due to the low capital, simple technology and relatively short time culture period. Nil tilapia culturists are grouped at least into 3 segments, namely (i) breeding farmers, (ii) first nursery farmers and (iii) secondary nursery farmers. Breeding farmers, first nursery farmers and secondary nursery farmers produce 1,5-1,7 cm, 2-4 cm and 5-7 cm fries, respectively. The objectives of the study are (i) to identify the internal and external factors of the nil tilapia farmer groups, (ii) to examine the economic feasibility of nil tilapia farmer groups, and (iii) to look for alternative development strategic for nil tilapia nil tilapia farmer groups. Required data and information are collected by interviewing nil tilapia breeder and farmers which are the members of Gemah Parahiyangan (GP) nil tilapia farmer groups. Data are analyzed using simple economics analysis such as net Benefit Cost Ratio (BC ratio), Pay Back Period (PBP), Net Present Value (NPV), Internal Rate of Return (IRR) and Break Even Point (BEP). Development strategic is analyzed using Strengths, Weaknesses, Opportunities, Threats (SWOT) Analysis. The results showed that (i) Discount Factor is 20% per year, (ii) BC ratio is 1,06, (iii) PBP is 338,4 days (11 months and 8,4 days) or equals to 4 cycles, (iv) NPV is Rp 1.950.102, (iv) IRR is 29,67%, and (v) BEP is 145.840 fries per cycle at selling price of Rp 63,00 per fry. Based on the analyzed data, it can be said that the nil tilapia farmer groups are profitable. SWOT Analysis suggested that best development strategic is (i) to establish collaboration work with fish feed industry, (ii) to extend the pond areas and (iii) to develop efficient nil tilapia production system. In the future, there should be a program on fisheries human resources capacity development especially on the nil tilapia farmer groups. In order to increase the aquaculture productivity, the government through District Fisheries Services should play a role to motivate, to escort and to train the fish farmers.
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Judul: Kinerja Produksi dan Kinerja Usaha Pembenihan Ikan Nila (Oreochromis niloticus) Nirwana 3 di Ernawati Farm Galunggung, Tasikmalaya
Abstrak: Berkembangnya kegiatan budidaya ikan nila sektor pembesaran, diperlukan jaminan terhadap ketersediaan pasokan benih yang berkesinambungan. Pembenihan merupakan langkah awal untuk mendukung tercapainya peningkatan suatu usaha perikanan. Tujuan dari penelitian ini adalah menganalisis kinerja produksi dan kinerja usaha pembenihan ikan nila Nirwana 3 di Ernawati Farm Galunggung, Tasikmalaya, Jawa Barat. Penelitian ini menggunakan metode studi kasus dengan adanya observasi, wawancara, dan mengikuti kegiatan pembenihan secara langsung untuk mengumpulkan data. Hasil menunjukkan bahwa kinerja produksi pada kegiatan pembenihan ikan nila Nirwana 3 di Ernawati Farm Galunggung menghasilkan produktivitas kolam hapa (kolam A) dengan rata-rata output sebesar 1.580 ekor tahun-1 m-², kolam tanah (kolam B, kolam E, kolam F) 2.124 ekor tahun-1 m-², dan kolam terpal (kolam G3 sampai kolam G8) 3.623 ekor tahun-1 m-². Kinerja usaha yang didapatkan pada usaha tersebut adalah PP 5,007 tahun dan R/C 1,295 sehingga usaha layak untuk terus dijalankan dan dalam pengembangan produksi kedepannya lebih merekomendasikan penggunaan kolam tanah dengan padat tebar 0,36 ekor/m² jantan dan 1,09 ekor/m² betina., The development of tilapia aquaculture activities in the grow-out sector requires ensuring the availability of a sustainable supply of seeds. Hatchery is the first step to support the achievement of increasing a fishery business. The purpose of this study was to analyze the production performance and business performance of Nirwana 3 tilapia hatchery at Ernawati Farm Galunggung, Tasikmalaya, West Java. This study used a case study method with observations, interviews, and direct seeding activities to collect data. The results showed that the production performance of Nirwana 3 tilapia hatchery at Ernawati Farm Galunggung resulted in the productivity of hapa ponds (pond A) with an average output of 1,580 fish year-1 m-², soil ponds (pond B, pond E, pond F) 2,124 fish year-1 m-², and tarpaulin ponds (pond G3 until pond G8) 3,623 fish year-1 m-². The business performance obtained in this business is PP 5,007 years and R/C 1,295 so that the business is feasible to continue and in future production development recommends the use of soil ponds with a stocking density of 0,36 male fish/m² and 1,09 female fish/m².
Keyword: Hatchery, Performance, Productivity, Tilapia

Judul: Pelabelan Super Vertex Magic
Abstrak: Super vertex magic labeling is labeling on graph with is a set of edges mapped into and is a set of vertices mapped into . It has a vertex magic labeling in which and represents the size and order of the graph respectively. This manuscript proves that paths, cyclics, and disjoint union of cyclics have a super vertex magic labeling. There are four theorems to be discussed. The first theorem proves that path is super vertex magic if and only if is odd and . The second theorem proves that cyclic is super vertex magic if and only if is odd. The third theorem proves that bijection function from an edge set onto of graph can be extended to a super vertex magic labeling if and only if the set amount of edge label that incidents with a vertex in the graph, consists of sequential integers as many as vertices in the graph. The fourth theorem proves that disjoint union of the cyclics consists of cyclics with each cyclic has vertices is super vertex magic if and only if and are odd.
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