Sofi Hanif
Balai Besar Pengembangan Budidaya Air Tawar Sukabumi

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Production Technique of Female Tilapia (Oreochromis niloticus) Brood Stock at Verification Level Functional Male (XX)

SAINTEK PERIKANAN Vol 5, No 1 (2009): Jurnal Saintek Perikanan
Publisher : SAINTEK PERIKANAN

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Abstract

A technology for producing tilapia monosex female brood stock was needed in order to fulfill the female brood stock for YY male brood stock. The first step was producing XX male brood stock. A monosex female brood stock generation could be obtained if XX male brood stock population was mated with the female. The objective of this activity was to obtained XX male brood stock veryvication result. The result showed that 2 XX male were obtained from 38 fungtional male brood stocks. This could be seen that from female offspring > 95% only 2 brood stocks, i.e. brood stock code 460041352B qnd 460966737A Key word: Tilapia, breeding programe, sex reversal, female offspring

PENERAPAN SELEKSI FAMILI F3 PADA IKAN NILA HITAM (Oreochromis niloticus)

SAINTEK PERIKANAN Vol 4, No 2 (2009): Jurnal Saintek Perikanan
Publisher : SAINTEK PERIKANAN

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Abstract

ABTSRAKPemuliaan ikan nila di Indonesia merupakan kegiatan perekayasaan yang sangat penting dilakukan untuk menigkatkan mutu genetik ikan nila yang ada di masyarakat. Metode Seleksi Famili telah digunakan sebagai satu metode efektif untuk mendapatkan strain induk nila yang lebih unggul. Pada tahun 2005 telah berhasil membuat generasi pertama seleksi famili sebanyak 35 famili, tahun 2006 telah menghasilkan 49 famili dan tahun 2007 menghasilkan 39 famili. Masing-masing famili terdiri dari dua sub populasi yaitu induk jantan dan induk betina. Jumlah populasi hasil seleksi pada sub populasi jantan dan betina masing-masing dapat memenuhi jumlah top grad minimal 15 ekor jantan dan 15 ekor betina. Jumlah famili yang memijah 39 famili. Hasil cut off pada masing-masing sub famili mempunyai bobot rataan 120,14+7,3 g pada sub populasi jantan dan 97,36 + 2,6 g pada sub populasi betina. Mutu genetik yang diperoleh pada generasi F3 menghasilkan nilai heritabiliti sebesar 0,142 dengan respon seleksi 25,4 g. Proses seleksi masih perlu dilanjutkan kepada generasi ke-4 untuk memperoleh generasi yang lebih unggul.Kata Kunci: Tilapia, program pemijahan, seleksi familiABSTRACTGenetic improvement of tilapia in Indonesia is very important in order to improve the tilapia quality. Family selection method was known as an effective method to get higher quality brood stock. In 2005, 35 first generation of families selection were successfully done, in 2006, 49 families were produced and in 2007, 39 families were produced. Each family consisted of two sub population, i.e. male and female brood stocks. The number of male and female sub population selection could fulfill the top grade minimal number of 15 males and 15 females. 39 families spawned. The cut off results of each sub family had average body weight of 120.14 ± 7.3 g for male sub population and 97.36 ± 2.6 g for female sub population. The genetic quality which was obtained on F3 generation had a heritability value of 0.142 with selection respond 25.4 g. The selection process was still needed to be continued on F4 generation to get better quality generationKey words: Tilapia, breeding program, family selection

Enhancing Students’ Creativity through STEM Project-Based Learning

Journal of Science Learning Vol 2, No 2 (2019): Journal of Science Learning (On Progress)
Publisher : Universitas Pendidikan Indonesia

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Abstract

In some school, teacher-centered is commonly found in the learning process. The learning process itself is still in the form of direct transfer of knowledge from teacher to students. Actually, students will learn better if they are engaged in meaningful learning activity.  STEM project-based learning is one of alternative teaching strategies that engaged students in meaningful learning. The aim of this study is to investigate the impact of STEM project-based learning on students' creativity in the topics of light and optics.  The study used qualitative research with narrative design. Data collection technique that used is observation. The population is eight grade students in one of Junior Secondary School that is located in Bandung, Indonesia. The sample consist of 25 students that chosen based on purposive sampling technique. The data is obtained through Creativity Product Analysis Matrix (CPAM). There are three creativity dimension that used in this study which are resolution, elaboration and novelty dimension. Students’ creativity is obtained as much 76% which categorized as good. Based on the result, STEM project-based learning give the good impact on students' creativity. STEM project-based learning can be used as alternative teaching strategies in Junior Secondary School.