Judul: Kajian proporsi bagian tubuh ikan dan kadar proksimat ikan gabus (Channa striata) pada berbagai ukuran
Abstrak: Snakehead (Channa striata) is a freshwater fish that known by Indonesian people. Snakehead is found in common waters and not yet cultivated widely. Snakehead live in outfall, lakes, swamp, and can also live in dirty water with low oxygen content and can resistant to drought. The purpose of this research is to know the body parts proportion of fish and chemical composition of flesh on any size and sex. Prosedure carried on research is measurement body proportion of fish and proximate analysis. The largest body part of snakehead found in flesh of 2 kg fish. The highest moisture and ashes content found on 0.5 kg male snakehead were 80.41 % and 1.47 %. The highest protein content was 20.14 % found on 1 kg female snakehead. The highest fat content was found on 2 kg male snakehead (1.69 %). The highest content of carbohydrate was found on 2 kg female snakehead (2.71 %).
Keyword: body proportions, proximate, snakehead (Channa striata)

Judul: Kajian Seksualitas dan Domestikasi Tahap Awal Ikan Gabus Hias (Channa limbata, Cuvier & Valenciennes 1831) asal Bogor, Jawa Barat.
Abstrak: Aktivitas penangkapan ikan di alam secara intensif di beberapa wilayah penyebaran ikan gabus menyebabkan penurunan populasi di beberapa wilayah di Indonesia. Praktik budidaya ikan dapat menyelamatkan ikan yang terancam punah dan memproduksi ikan yang terdomestikasi Penelitian ini bertujuan mengkaji tahapan domestikasi awal ikan gabus Channa limbata meliputi aklimatisasi dan status seksualitasnya sebagai dasar pengembangan budidaya ikan gabus hias. Hasil pengamatan dimorfisme seksual ikan C. limbata yang berupa 29 karakter morfometrik, 6 karakter meristik dan ciri lubang urogenital menunjukkan tidak adanya perbedaan nyata antar dua jenis kelamin. Aklimatisasi dilakukan selama 14 hari dengan pemeliharaan pada ukuran yang berbeda yaitu ukuran 50-100mm, 100-150mm dan >150mm. Nilai sintasan terendah pada aklimatisasi didapatkan pada kelompok ikan dengan ukuran >150mm sebesar 75%., The intensive fishing activities in several habitats of snakehead fish have led to a decline in populations in various regions of Indonesia. The practice of fish farming can help save endangered fish populations and cultivate domesticated fish. This research aims to study the initial domestication stages of Channa limbata snakehead fish, including acclimatization and their sexual status, serving as a foundation for the development of ornamental snakehead fish cultivation. Observations of sexual dimorphism in C. limbata involved 29 morphometric characters, 6 meristic characters, and characteristics of the urogenital pore, revealing no significant differences between the two genders. Acclimatization was conducted over 14 days, maintaining fish of different sizes: 50-100mm, 100-150mm, and >150mm. The lowest survival rate was observed in fish group larger than 150mm was at 75%.
Keyword: acclimatization, aquaculture, Channa limbata, domestication, dimorphism

Judul: Bifurkasi Hopf pada Model Siklus Bisnis Kaldor Kalecki tanpa dan dengan Waktu Tunda
Abstrak: Business cycle model is one of dynamical system models in economic. One of the business cycles model is Kaldor-Kalecki model. Kaldor-Kalecki business cycle model that is written in delayed defferential equations, is a business cycle model that involves gross product and capital stock of a company. In this paper Kaldor-Kalecki business cycle model is analyzed using both nondelay and delay in time of capital stock. By Taylor expansion for the time delayed model, an analysis of stability around the fixed points has been done. Furthermore, by using Hopf bifurcation theorem, it can be shown that there exists periodic orbits and limit cycle. In the nondelayed model, changing the parameter of goods market could lead to the occurrence of Hopf bifurcation and the existence of limit cycle. Similarly, for the delayed model, it has been shown that changing the time delay parameter may result in the occurrence of Hopf bifurcation and limit cycle.
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