Judul: Pendugaan Nilai dan Sebaran Target Strength lkan Pelagis di Selat Makassar pada Bulan Oktober 2003
Abstrak: Metode akustik merupakan metode yang menggunakan gelombang suara dan perambatannya untuk mendeteksi obyek/target dalam suatu medium. Keunggulan metode akustik ini adalah berkecepatan tinggi, estimisi stock ikan secara langsung,memungkinkan memperoleh dan memproses data secara real time, akurasilketepatan tinggi, tidak merusak karena frekuensi yang digunakan tidak membahayakan si pemakai alat ataupun target.
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Judul: Pengukuran Nilai Target Strength Ikan Pelagis dan Demersal Dengan Menggunakan Sistem Akustik Bim Terbagi (Split Beam Acoustic System) di Laut Arafura Pada Bulan Oktober-Nopember 2003
Abstrak: Sumberdaya perikanan di Indonesia memiliki potensi yang cukup besar yang belum dimanfaatkan secara optimum. Pemanfaatan sumberdaya ikan dapat dilakukan secara optimal apabila data keberadaan sumberdaya ikan diketahui secara akurat, sehingga langkah-langkah kebijakan eksploitasi dapat dilakukan dengan tepat agar tidak membahayakan kelestarian sumberdaya ikan. Metode hidroakustik merupakan suatu metode untuk mendeteksi objek bawah air (ikan) dengan memanfaatkan gelombang suara. Informasi yang akurat dan tepat tentang kepadatan atau kelimpahan stok ikan di suatu perairan merupakan masukan yang sangat berguna bagi rasionalisasi dan implementasi pemanfaatan sumberdaya hayati laut. Untuk pendugaan kelimpahan ikan tersebut, pengukuran target strength (TS) secara in situ dan realtime merupakan suatu keharusan.
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Judul: Biological Characteristics of Jatropha curcas Trimonoecious
Abstrak: Physic nut (Jatropha curcas L.) is an original plant from tropical America belonging to the family of Euphorbiaceae and an annual plant of monoecious. Commonly J.curcas have male and female flowers on the same plant. There are currently some J. curcas which have hermaphrodite flowers from monoecious plants, but very rarely. J. curcas with hermaphrodite flowers are classified as andromonoecious type (having hermaphrodite and male in the same plant) and trimonoecious type (having male, female, and hermaphrodite flowers in the plant). Trimonoecious plants with hermaphrodite flowers were tend to perform self-pollination (geitonogamy) and produce a homogenous and high-productivity in next generation. J. curcas plants is difficult in differentiating between monoecious and trimonoecious plants when it seedling, and this is a limiting factor to know development of trimonoecious J. curcas. Trimonoecious J.curcas can be identified after six months of planting, and when it have started flowering. Therefore, the trimonoecious J. curcas biological characteristics needs to be an observation. The trimonoecious trait in J. curcas plants can be identified through several analyses, i.e. the analysis of agronomical characteristics, the chromosomes analysis, the isozyme analysis, and the analysis of pollen viability. The study was conducted in December 2011 - February 2013. The experiments were conducted using the Randomized Complete Block Design for one factor, the J. curcas genotype with 5 replicates. Each unit of the experiment consisted of 5 plants. Aagronomics characteristic analyses were conducted using analysis of variance (ANOVA) followed by the Duncan Multiple Range Test (DMRT) at 5% level. The classification of heritability and Genetic Variation Coefficient (GVC) criteria and relative Phenotypic Variation Coefficient (PVC). The analysis of genetic distance clustering was done using the Minitab 1.5 program clustering method. J. curcas stem trimonoecious characters is the primary branches angle, stem diameter, number of primary and secondary branches have a higher size than monoecious plants. Diameter and thickness fruit flesh origins from monoecious plants larger than fruit from plants trimonoecious. Characteristics of the trimonoecious plants in this study were almost the same with their mother plant. Number chromosomes number of J. curcas plant genotypes have 2n = 22 chromosomes The average length of the trimonoecious plant’s chromosome was longer than the average for monoecious plants. The length of chromosomes can differ among one family, even though the numbers of the chromosomes are similar. Isozymes peroxidase (Rf 0.83) and esterase (Rf 0.20) could be used as markers to differentiate between trimonoecious and monoecious plants. Male flower pollen viability of plant origin trimonoecious have a slower rate of decrease than male flowers monoecious plants. The dendrogram from the cluster analysis results could differentiate between trimonoecious and monoecious plants with a variation coefficient of 27.25.
Keyword: Esterase, peroxidase, pollen viability, trimonoecious