Jurnal Akuakultur Indonesia 2020-02-18T07:26:15+00:00 Prof. Dr. Muhammad Zairin Junior Open Journal Systems <p>Jurnal Akuakultur Indonesia (JAI) is a scientific journal publishes empirical research and recent science development in aquaculture. JAI is published twice a year in January and July since 2002 by the Indonesian Society of Scientific Aquaculture (ISSA) in association with the Department of Aquaculture, Faculty of Fisheries and Marine Science, Bogor Agricultural University. JAI accepts manuscripts written in English and in Bahasa (Indonesian). JAI only processes submitted original script related to aquaculture and not being published by other publishers. JAI has been registered in some indexing tools like Directory of Open Access Journals (DOAJ), Indonesian BASE, Publication Index (IPI), Google Scholar, Portal Garuda, Mendeley, SINTA, and IPB repository.</p> <p>&nbsp;</p> <p>p-ISSN <a href="" target="_blank" rel="noopener">1412-5269</a>&nbsp; /&nbsp; e-ISSN <a href="" target="_blank" rel="noopener">2354-6700</a></p> Characterization of fermentation liquid from mangrove leaves Avicennia marina and its inhibitory potential for bacterium causing ice-ice disease 2020-01-24T02:43:16+00:00 Samsu Adi Rahman Sukenda Widanarni Alimuddin Julie Ekasari <p><strong>ABSTRACT</strong></p> <p>&nbsp;</p> <p>Fermentation liquid from mangrove leaves <em>Avicennia marina</em> contains microorganisms, nutrients, and secondary metabolites. This study aimed to identify bacteria and the compounds in fermentation liquid of mangrove leaves <em>A. marina</em> and measured their inhibitory capacity against pathogenic bacteria <em>Stenotrophomonas maltophilia</em> which causes ice-ice disease in seaweed. Molecular analysis which aimed the 16S rRNA gene showed that the bacteria in fermentation liquid consisted of eight types of <em>Bacillus</em>, <em>Bacillus subtilis</em> MSAR-01, <em>Bacillus megaterium</em> MSAR-02, <em>Bacillus firmus</em> MSAR-03, <em>Bacillus thuringiensis</em> MSAR-04, <em>Bacillus subterranerus</em> MSAR-05, <em>Bacillus vietnamensis</em> MSAR-06, <em>Bacillus</em> sp. MSAR-07,<em> Bacillus circulans</em> MSAR-08, with the best inhibitory power indicated by <em>B. subtilis</em> MSAR-01, <em>B. vietnamensis</em> MSAR-06, and <em>Bacillus</em> sp. MSAR-07. The administration of lactic acid, bacteriocin, total fermentation liquid, and supernatant as much as 15 mL produce inhibition to <em>S. maltophilia</em> indicated better result &nbsp;than using one or a combination of several types of bacterial isolates. The inhibition of single bacterial enriched fermentation and supernatant liquids was better than bacterial combination enrichment.</p> <p>&nbsp;</p> <p>Keywords: <em>Avicennia marina</em>, fermentation, ice-ice, mangrove</p> 2020-01-24T02:17:15+00:00 Copyright (c) 2020 Jurnal Akuakultur Indonesia Reproductive and growth performances in female giant freshwater prawn following inhibition of gonadal maturation using dopamine and medroxyprogesterone hormone 2020-02-18T07:26:15+00:00 Megawati Wijaya Agus Oman Sudrajat Imron <p><strong>A</strong><strong>BSTRACT</strong></p> <p>One of the main problem in giant river prawn (GFP) culture is early gonadal maturation in female resulting a reduced growth performance. This problem cause economic losses. When GFP at gonadal maturation, somatic growth will be inhibited because energy is used for reproduction. A factorial experimental design using two factors, namely dopamine and medroxyprogesterone, with each factor consist of three levels was applied. Three dopamine levels were 0, 10-5 mol/shrimp, and 10-10 mol/shrimp, while the medroxyprogesterone levels were 0, 75 mg/1.5 mL/bodyweight, and 150 mg/3 mL/bodyweight with a density 15 individual/tank. The utilization of dopamine and medroxyprogesterone in GFP (initial bodyweight : 11.27 ± 0.97 g) through injection at the third periopod was done three times at week 0, 2nd, and 4th with two weeks interval. The results showed that hormone inhibitor treatments affected both growth and reproductive performances in female GFP. The treated individuals showed a lower gonadal maturity indicator values and faster growth rate than control. Gonadal maturity, as shown by gonad histology, in all treatments were lower (previtelogenic and vitellogenic stages) than that in control which is in mature stage. Estradiol concentration premix dopamine 10-10 mol/shrimp and medroxyprogesterone 150 mg/3 mL/bodyweight treatments are lower than control. In conclusion, dopamine and medroxyprogesterone administration could suppres GSI and gonad development, and also increase growth rate.</p> <p>Keywords: Macrobrachium rosenbergii, dopamine, medroxyprogesterone, gonad development, growth.</p> 2020-02-18T07:26:15+00:00 Copyright (c) 2020 Jurnal Akuakultur Indonesia