Judul: Pengelolaan Sumber Daya Ikan Tetengkek (Megalaspis cordyla, Linnaeus 1758) di Pelabuhan Perikanan Nusantara Karangantu- Banten
Abstrak: This research is aimed to determine the optimum allocation of Torpedo scad resources in the PPN Karangantu, Banten. The optimum value that calculated such as level of production, the amount of effort and the value of the benefit of the fish resources. The results showed that have not experienced over exploitation yet. Surplus production models used in this research are the models of Schaefer, Fox, Walter Hilborn, Schnute and Clarke Yoshimoto Pooley. Schaefer models had R2 values that greater than other surplus production models. The value of R2 in this model is 77%. On the actual condition of the catched of 1111 kg/year with a fishing effort of 4,17 trips/year. In the regime of open access management has the highest value of effort but zero benefit. Based on the analysis of the bioeconomy got the sustainable catched (MSY) of 2092 kg/year and fishing effort (Fmsy) by 5,22 trips/year, and the catchs (MEY) of 2110 kg/year and fishing effort (Fmey) 5,21 trip/year. Bioeconomy analysis shows that the value of Factual is smaller than the value of Fmsy and also Fmey. This indicated that the resources of Torpedo scad has not been experiencing over exploitation both biologically and economically.
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Judul: Kajian Stok Dan Ketidakpastian Sumber Daya Ikan Tetengkek (Megalaspis cordyla, Linnaeus 1758) Di PPN Karangantu
Abstrak: PPN (Archipelago Fishery Port) Karangantu is located in Kasemen District, Serang city, Banten Province. One of the fishes landed there is Torpedo Scad. The purpose of this research are to assess the stock of the fish using biologi parameter approach and the uncertainty using Monte Carlo model. Torpedo Scad (Megalaspis cordyla) is a bycatch of the fishing gear dogol. Torpedo Scad that was obtained during the research has distribution of length frequency range from 200 to 355 mm. It’s growth coefficients (K) for female and male is 0.2286 and 0.2896. Based on the relationship of Length and weight, female and male fish are allometric negative. The exploitation rate of Torpedo Scad is 15.92%. Based on the exploitation rate, Torpedo Scad catching is still underfishing, because of Torpedo Scad is bycatch
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Judul: Prenilasi Senyawa β-Diketon sebagai Prekursor 3-Prenilflavon
Abstrak: One group of flavonoids that has not been commonly synthesized is 3- prenylflavone. The main objective of this experiment was to synthesize precursor of 3-prenylflavone. Firstly, β-diketone was synthesized via 4 steps from phenol as starting compound with total yield of 24%. Prenylation of β-diketone with prenyl bromide and K2CO3 base produced 4 fractions which were separated by using preparative thin layer chromatography (PTLC) with n-hexane:EtOAc (8:2) as the eluent. Fraction with Rf = 0.80 was further separated by using preparative PTLC with n-hexane:EtOAc (99:1) as the eluent. Two fractions were obtained with Rf = 0.38 and 0.42. The first fraction has been characterized as diprenylated β-diketone with 49% yield. Application of protecting group on the phenolic OH group in β- diketone are needed to obtain monoprenylated β-diketone which can be further cyclized into 3-prenylflavone
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