Judul: Reproduction Study of Lemuru(Sardinella lemuru Blk.) Based on Sexual Maturity and Fish Length to Predict Spawning Season at East Coast of Siberut Island
Abstrak: The aim of this research is to evaluate reproductive pattern of Sardine (Sardinella lemuru Blk.) in east coast of Siberut Island. The study was focused on observation of reproductive attributes including sexual maturity, fecundity, body length and body weight by collecting =50 samples monthly for one year. A total sampel of 777 fish were caught using gillnet and measured individually before dissecting to analyze sex and gonadal maturity. Gonadal Somatic Index (GSI) and egg diameter were analyzed according Gaughan et al. (2000) to determine body size at first maturity and spawning season that will be useful as important consideration for management policy of Sardinella in Siberut Island. Based on the relationship between sexual maturity and body size, Sardinella lemuru begin to spawn at 163 mm and 153 mm in length for female and male respectively. Female Lemuru can produce 1.688 – 21.573 egg for each spawning time with average fecundity 7.850 egg. Sexual maturity status that recorded for one year indicated that spawning season take place between September and October. There is no evidence that lemuru spawn more than one time a year and distribution of egg diameter showed that Sardinella lemuru is partial spawner that spawn more than one time during spawning season.
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Judul: Status stok sumberdaya ikan lemuru (Sardinella lemuru) di Perairan Selat Sunda
Abstrak: Sardinella lemuru is one of small pelagic fish and become one of fishing target. The aim of this research is to determine the stock status, proper and sustainable management of Sardinella lemuru in the Sunda Strait area based on fish catch landed on PPP Labuan. This research was conducted from May- September 2014. Data analysis consist of sex ratio, length and weight relationship, condition factor, gonadal maturity level, fecundity, length distribution, age group identification, growth parameter, exploitation rate and surplus production model. The result of this research showed that the growth pattern of female Bali Sardinella is negative allometric and the male Bali Sardinella is isometric. Exploitation rate has exceeded the optimum exploitation rate. Surplus production model analysis showed that MSY is 372.46 ton per year and optimum effort amount is 285 trip per year. Management that can be suggested are the limitation of fishing effort and yield, the selectivity of fishing gear, and determine fishing season.
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Judul: Film Nanokomposit Polivinil Alkohol–Oksida Grafena dari Cengkih.
Abstrak: Polivinil alkohol (PVA) dalam industri dapat digunakan menjadi perekat, pengubah, dan bahan pengemas. Namun, polimer yang biodegradabel memiliki banyak keterbatasan karena penghalang rendah dan sifat termomekanis. Untuk meningkatkan sifat yang diinginkan, penguatan bahan polimer dengan nanofiller menggunakan oksida grafena berpotensi sebagai komposit polimer. Sumber karbon yang digunakan juga tersedia di alam dalam bentuk biomaterial yang berasal dari tumbuhan, antara lain dari cengkih. Oksida grafena disintesis menggunakan metode modifikasi Hummers dan hasil digunakan sebagai nanokomposit dalam film PVA. Oksida grafena hasil sintesis berupa serbuk hitam yang berukuran partikel kurang seragam dengan fasa amorf. Tambahan oksida grafena ke film PVA menghasilkan kuat tarik yang lebih tinggi dengan modulus Young yang bertambah sehingga lebih kaku dibanding film PVA.
Keyword: cloves, graphene oxide, mechanical properties, nanocomposite film, polyvinyl alcohol