The Fe3O4/chitosan nanocomposite is one of the attractive functional materials. It can be applied as active material in a sensor system for an instant Surface Plasmon Resonance (SPR) based sensor. This research aimed at investigating the optical properties of Fe3O4/chitosan and its effect on the SPR angle. The synthesis of nanoparticles used the coprecipitation method. Encapsulation was carried out at a temperature of 50 o C for about 60 minutes. The samples were characterized for their structural properties and phase composition by using X-ray diffraction (XRD) techniques. Their optical properties were characterized by using the Specular Reflectance UV-Vis Spectroscopy technique. The optical properties, such as absorbance (A), absorption coefficient (α), refractive index (n), extinction coefficient (k), optical gap energy (Eg), and Urbach energy (Eu) are investigated. The measurement of the SPR angle toward the ATR curve was carried out in a range of 30 o -60 o by using the Kretschmann configuration. The results show that encapsulation affects the optical properties of the nanoparticles. The SPR angle of prism/Au/Fe3O4/Air and prism/Au/Fe3O4-Chitosan/Air system is about 50.04 o and 50.93 o , consecutively. Chitosan affects an increase of the SPR signal toward the reflectivity where the SPR angle exists. These results imply a future prospective application of the Fe3O4/Chitosan as a signal amplifier material for the SPR sensor.

Pakan merupakan salah satu komponen strategis yang sangat menentukan keberhasilan usaha budidaya. Pada kegiatan tersebut, hampir 60-70% dari total biaya produksi digunakan untuk pembelian pakan. Tujuan pelaksanaan kegiatan pelatihan pembuatan pakan ikan ini adalah untuk membantu pembudidaya ikan dalam memenuhi ketersediaan pakan selama budidaya sehingga dapat menekan biaya pakan yang relatif mahal. Pengabdian masyarakat dilaksanakan pada bulan Juli 2021 yang bertempat di Laboratorium Sistem dan Teknologi Budidaya, Fakultas Perikanan dan Ilmu Kelautan Universitas Khairun dengan melibatkan keterwakilan pelaku usaha budidaya dan mahasiswa program studi budidaya perairan. Metode pelatihan terdiri dari penyuluhan langsung bagaimana membuat pakan yang baik dengan menggunakan bahan-bahan yang ada di sekitar dan mudah didapat serta murah. Kesimpulan yang dapat diambil yaitu pembuatan pakan ikan dapat dilakukan oleh pembudidaya ikan dengan mudah, bahan baku yang digunakan dalam pembuatan pakan dapat diperoleh di wilayah sekitar sehingga mempermudah pembudidaya untuk membuat pakan sendiri tanpa tergantung dari pakan komersial (pabrik), hal ini dapat membantu menekan biaya pakan yang selama ini menjadi masalah ditingkat pembudidaya.

Indari is one of the coastal areas in the West Bacan Subdistrict, Regency of South Halmahera, Province of North Mollucas. Fisheries business activities that are quite popular in this region are aquaculture with seaweed commodities. Indari waters is also one of the areas designated as seaweed cultivation development zones in Province of North Mollucas. One of the factors that determine the success of a seaweed cultivation business is production. This is because production is the final result obtained from a cultivation business. The purpose of this research was to determine the production of seaweed K.alvarezii cultivation based on seasons. The method used in the survey is a method of interviewing using questionnaires to seaweed farmers as many as 30 people. Production data collected is wet and dry production data by season. Production data collected is wet and dry production data by season. The results showed that the highest seaweed K.alvarezii production was found in the dry season with wet production of 9.320 kg and dry production of 852.5 kg, whereas in the rainy season, wet production was 898.125 kg and dry production was 718.5 kg.

Varietas cabai yang stabil dan berdaya hasil tinggi diperlukan untuk peningkatan produksi cabai nasional. Penelitian ini bertujuan untuk mengevaluasi stabilitas hasil 16 genotipe cabai rawit (Capsicum fructescens L.) dengan menggunakan analisis stabilitas parametrik (Francis-Kannenberg, Wricke, Finlay-Wilkinson, AMMI dan GGE). Penelitian ini dilaksanakan pada bulan Agustus 2018 sampai September 2019 pada empat lokasi, yaitu Kolaka, Palembang, Aceh dan Bogor. Penelitian ini menggunakan rancangan kelompok lengkap teracak dengan tiga ulangan. Genotipe cabai rawit yang dievaluasi adalah F5285290-237-6-1, F6285290-6-10-1-1, F5285290-290-2-1, F5285290-290-9-1, F5285290-290-9-3, F5321290-40-2-1, F5285290-123-6-15, F6321290-252-10-8-4, F5285290-38-6-3, F6321290-252-10-8-23, F6321290-252-10-8-75, Bonita IPB, Inul (varietas lokal), Cakra putih (varietas komersial), Taruna (varietas komersial), dan Tobasco. Interaksi genotipe x lingkungan berpengaruh nyata terhadap hasil. genotipe F6321290-252-10-8-4 diidentifikasi sebagai genotipe stabil berdasarkan beberapa metode stabilitas parametrik, namun genotipe tersebut tidak memiliki rata-rata hasil tertinggi. Sedangkan analisis GGE mengidentifikasi Bonita IPB sebagai genotipe yang stabil dengan daya hasil tertinggi. Kata kunci: AMMI, analisis stabilitas, cabai rawit, varietas

Fish feed is the most essential necessity and the biggest contributor on production cost of fish cultivation. As much as 50-70% production cost is for fish feed. It can be deducted by made alternative fish feed. Black soldier fly larvae is an alternative fish feed with high protein content and most importantly it is cheap. The aim of this research was to evaluate the growth and nutrition content of black soldier fly larvae which cultivated in different medium. Medium used in this study was combination of coconut pulp residue and three other different medium, such as tofu dregs, sago dregs, and rice bran. Each combination had three different level of concentration, 1:1, 1:3, 1:5 (w:w). It was evaluated for nutrition content (proximate analysis), biomass, and dried yield. The result showed combination of coconut pulp and sago dregs 1:5 produced the highest biomass (465 g), but black soldier fly larvae produced from combination of coconut pulp residue and tofu dregs 1:3 had the highest protein content (39.78%). The best medium to produce black soldier fly larvae based on multiple attribute decision making (MADM) method was from the combination of coconut pulp residue and sago dregs 1:5 (w:w). It had 465 g biomass, 186 g dried yield, 23.73% protein, 47.67% fat, and 22.15% carbohydrate.