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Tajuddin Siregar, Tajuddin
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AKTIVITAS ANTIMIKROBA EKSTRAK KULIT BUAH MANGGIS (Garcinia mangostana) TERHADAP BAKTERI Aeromonas hydrophila, Edwardsiella tarda DAN JAMUR Saprolegnia sp. Handayani, Madiah; Suryanto, Dwi; Siregar, Tajuddin; Efendi, Zulhan
AQUACOASTMARINE Vol 8, No 3 (2015): JURNAL AQUACOASTMARINE VOLUME 8, NO 3, JUNI 2015
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

This study was aimed to know antimicrobial potential of extract of mangosteen rind(Garcinia mangostana) against bacteria Aeromonas hydrophila, Edwardsiella tarda andfungus Saprolegnia sp. and to know the extract toxicity to brine shrimp (Artemia salinaLeach.). Mangosteen rind was extracted using methanol, ethyl acetate and n-hexane.Antimicrobial activity test was done using the agar diffusion method. To know thecompounds contained in the extract phytochemical test was conducted. The chemicalcompound test showed that extract of mangosteen rind contains phenolic/tannin/flavonoid,terpen/steroid dan alkaloid. The extracts inhibitated the growth of Aeromonas hydrophila,Edwardsiella tarda and Saprolegnia sp. to some extent. The optimal antimicrobial activitywas obtained from ethyl acetate. The extract showed cytotoxic activity with LC50<1000μg/ml.Keywords : Antimicrobial activity, Aeromonas hydrophila, Edwardsiella tarda, Garciniamangostana, Saprolegnia sp.
LAJU DEKOMPOSISI SERASAH DAUN Rhizophora mucronata DAN KONTRIBUSINYA TERHADAP NUTRISI DI PERAIRAN PANTAI SERAMBI DELI KECAMATAN PANTAI LABU Panjaitan, Albino; Djayus, Yunasfi; Siregar, Tajuddin
AQUACOASTMARINE Vol 10, No 5 (2015): JURNAL AQUACOASTMARINE
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

The mangrove litter which has been decomposed contributes organicmatter as food source for many species of fish and other organisms in themangrove ecosystem. The purpose of this research is to know the decompositionrate of R. mucronata litter leaf and to know the nutrient content of carbon (C),nitrogen (N) and phosphorus (P) in the R. mucronata litter leaf which beenreleased during the decomposition time. This research was done at Serambi DeliBeach Deli Serdang Regency, North Sumatra Province during July untilNovember 2014. This research used purposive sampling method at three stationsand the determination of the station is done by seeing the availability of R.mucronata at the Serambi Deli Beach. The results showed that the decompositionrate of R. mucronata litter leaf on day 105 are 6,41 in stasiun I, 3,56 in station IIand 5,35 in station III. The fastest decomposition rate is the station I with 6,41and the slowest decomposition rate is the station II with 3,56. The nutrient ofcarbon during decomposition in 105 days are 23,48% at station I, 21,96% atstation II and 28,4% at station III. Nutrient of nitrogen which been decomposedon day 105 are 0,42% in station I, 0,7% in station II and 0,54% in station III.Nutrient of phosphorus during decomposition in 105 days are 0,20% in station I,0,22% in station II and 0,23% in station III.Keywords : Serambi Deli Beach, Decomposition, Rhizophora mucronata
KAJIAN UNIT PENANGKAPAN RAWAI DI PPI SIALANG BUAH KECAMATAN TELUK MENGKUDU KABUPATEN SERDANG BEDAGAI SUMATERA UTARA Nasution, Riki Ardiansyah; Patana, Pindi; Siregar, Tajuddin
AQUACOASTMARINE Vol 6, No 2 (2018): AQUACOASTMARINE
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

Rawai is a fishing gear with the target of demersal fishes. The purpose of this research is to know the operation of longline fishery unit in terms of the construction of fishing gear, the operation and the composition of the catch and to know the productivity of fishing gear and to analyze the feasibility of longline business used by Sialang Buah fishermen. This research was conducted in PPI Sialang Buah Teluk Mengkudu Subdistrict of Serdang Bedagai District of North Sumatera for one month that is in October 2017. The research results obtained some types of fish, among others: Pari (Gymnura japonica), White Kakap (Lates Calcalifer), Grouper Epinephulus sp), Manyung fish (Netuma thalassina), Gerpu fish, Jenahar fish, Aluh fish - aluh, Red Snapper (Lutjanus malabricus), Pepeh fish. The value of the catch rate in the longline fishing gear is 277.2 kg. Business analysis for Revenue-Cost Ratio (R / C) of 1.25 which means fishing business is feasible to continue and Payback Period (PP) value is 1.4 years.Keywords: Sialang Buah, longline fishing gear, catch composition, business analysis.