Judul: Perubahan Kualitas Media pada Produksi Ikan Nila Oreochromis niloticus dalam Budidaya Intensif Sistem IMTA Outdoor dengan Kepadatan yang Berbeda
Abstrak: Perikanan budidaya khususnya budidaya ikan nila Oreochromis niloticus diharapkan terus berkembang untuk memenuhi kebutuhan protein masyarakat. Penurunan kualitas air dan luas lahan budidaya menyebabkan budidaya ikan nila harus dilakukan secara intensif salah satu alternatifnya melalui pemanfaatan sistem IMTA (Integrated Multi-Trophic Aquaculture) untuk menjaga kualitas air dan menekan pergantian air secara berlebihan. Untuk itu, penelitian ini akan melihat perubahan kualitas air yang terjadi pada kolam pendederan ikan nila pada padat penebaran berbeda yang menggunakan sistem IMTA. Tujuan penelitian ini adalah menelaah perubahan kualitas air media budidaya ikan nila yang menggunakan sistem IMTA terbuka (outdoor) dengan kepadatan yang berbeda. Rancangan penelitian yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan 3 perlakuan dan 3 kali ulangan. Perlakuan meliputi kepadatan ikan nila 100 ekor/m3, 150 ekor/m3 dan 50 ekor/m3 sebagai kontrol yang dipelihara pada stagnant water. Pengukuran kualitas air dilakukan secara berkala, terdiri dari sifat fisika kimia air media selama pemeliharaan yaitu suhu, pH, DO, amonia, nitrit dan nitrat serta pengukuran parameter biologi ikan. Hasil penelitian padat penebaran yang berbeda pada setiap perlakuan yang digunakan menunjukkan perubahan kualitas air yang masih dalam kisaran normal untuk pendederan ikan nila. Namun, perlakuan yang memberikan hasil pertumbuhan, kelangsungan hidup dan hasil produksi yang terbaik adalah kepadatan ikan 150 ekor/m3 dibandingkan perlakuan lainnya.
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Judul: Kualitas Air dan Produksi Budidaya Ikan Nila (Oreochromis niloticus) dengan Feeding Rate Berbeda pada Sistem IMTA (Integrated Multi Trophic Aquaculture)
Abstrak: This research aims to knowing the quality of water by determinating optimal feeding rate on growth, survival, feeding efficiency, economic analysis and productivity of the Tilapia maintained by IMTA system. Tilapia fish which used in this study were about 6.68±0.63 cm length and 4.9±1.38 g weight on the average and 50 m2 stocking density. The container that used was 9 concrete pools with measurement of large 7 m2 for each pool. Intensive Tilapia farming with IMTA system had the best result in treatment by feeding 2.5% of biomass which could provide quality of water conditions in the appropriate range of water quality for cultivation such as temperature (25.2 to 31.1 ° C), pH (6.6 to 8.5) , DO (1.9 to 6.59 mg/l), ammonia (0.0003 to 0.0208 mg/l), nitrite (0.0048 to 0.179 mg/l), nitrate (0 to 0.403 mg/l) , phosphate (0.12 to 0.384 mg/l), survival rate (94.86±2.00%), the absolute length of (6.77±0.20 cm), absolute weight (35.28±1.93 g), SGR (2.96±0.07%), EP (229.65±28.39%), productivity could reach up to 14 665 g and profit up to Rp 553 360 was the best result of economic analysis and good quality of water with IMTA system could press feeding rate to 2.5%.
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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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