Judul: Pengaruh Lama Perendaman Induk Di Dalam Aromatase Inhibitor Terhadap Proporsi Kelamin Anak Ikan Gapi Poecilia reticulata Peters
Abstrak: Guppy is one of the freshwater ornamental fish commodities which is popular and much demanded by the public, especially males guppy. This has caused generating males guppy or monosex population is more profitable. In this research, aromatase inhibitor was used in sex reversal method to produce male offsprings by immersion (dipping) of the gravid females guppy. The females Guppy was dipped in 50 ppm of aromatase inhibitor solution in different period i.e. 0, 8, 16 and 24 hours. Results showed that the treatment of 24 hours dipping period indicated the highest percentage of males offspring was 78.63%. Aromatase inhibitors do not affect the level of sustainability. Increasing of dipping period in aromatase inhibitor could increase masculinization guppy’s offspring.
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Judul: Pengaruh aromatase inhibitor dengan metode perendaman induk terhadap nisbah kelamin ikan gapi (poecilia reticulata peters) pada suhu 30 c
Abstrak: Penampakan morfologis dari ikan gapi jantan umumnya lebih menarik dibandingkan dengan betina. Hal ini menyebabkan nilai jual ikan gapi jantan lebih tinggi daripada ikan gapi betina, sehingga perlu adanya usaha manipulasi kelamin yang bertujuan untuk memperoleh populasi monoseks jantan. Untuk memproduksi monoseks jantan dapat dilakukan melalui teknik sex reversal dengan menggunakan inhibitor aromatase (aromatase inhibitor, AI). Tujuan dari penelitian ini adalah untuk mengetahui pengaruh aromatase inhibitor terhadap nisbah kelamin ikan gapi (Poecilia reticulata Peters) melalui perendaman induk dengan dosis 100 mg/l, 200 mg/l, dan 300 mg/l selama 24 jam pada suhu 30°C. Penelitian ini berlangsung pada bulan Juni sampai Nopember 2002 bertempat di Laboratorium Sistem dan Teknologi, Laboratorium Lingkungan, dan Laboratorium Penyakit Ikan, Jurusan Budidaya Perairan, Fakultas Perikanan dan Ilmu Kelautan, Institut Pertanian Bogor. Adapun rancangan percobaan yang dilakukan adalah perbedaan dosis AI (0 mg/l, 100 mg/l, 200 mg/l, dan 300 mg/l) terhadap nisbah kelamin ikan gapi. Ikan uji yang digunakan sebanyak 12 ekor untuk 4 perlakuan dengan masing-masing 3 ulangan. Penghitungan nisbah kelamin dilakukan dengan cara identifikasi morfologis dan histologis setelah ikan berumur 1 bulan. Parameter lain yang diamati adalah ...
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Judul: Shape and Vein Extraction on Plant Leaf Images with Fourier and B-Spline Modeling.
Abstrak: Leaf features extraction on plant leaf image is still be a problem on automatic plant leaf identification. Shape and venation of leaf are a significant part of leaf for distinguishing a species of leaf from each other. Shape feature extraction with Hough transform and Fourier descriptor were implemented and their effectiveness on leaf shape recognition were compared. Effectiveness of both shape recognition methods were evaluated by recall-precision measurement. Recall-precision evaluation showed that leaf shape represented by Fourier descriptors is more effective than represented by Hough transform. Plant leaf image vein extraction using b–spline representation was implemented. An automatic initialitation of vein search parameter using Standard Hough Transform was proposed. Keywords: leaf shape extraction, leaf vein extraction, fourier descriptor, b-spline.
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