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Effect of Salinities and Dietary Patterns toward Fullness of Gut and Gut Evacuation Time of the Newly Introduced Penaeus merguiensis Larvae Mostafa Imhmed Ighwerb; Johannes Hutabarat; Ervia Yudiati; Rudhi Pribadi; Widianignsih Widianingsih; Retno Hartati; Abidin Nur II; Arumning T. Fauziah; Jelita Rahma Hidayati
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 26, No 2 (2021): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.26.2.71-78

Abstract

The gut capacity of shrimp larvae is minimal, and their digestion is often challenged by the inevitable fact that they tend to develop slowly during the zoea stage. Many studies approved that the digestive capacity of shrimp larvae could be improved by increasing the retention time of food in the intestine. Gut evacuation time and fullness of the gut are crucial parameters in assessing the growth of shrimp larvae, and the diet as well as  environmental conditions indeed influence the activity of these parameters. Although many species of shrimps have a wide salinity tolerance, more specific research on salinity and its relation to the type of diet is necessary to find the optimum condition supporting the growth of shrimp larvae. By employing Penaeus merguiensis larvae, this study evaluates the effect of three nominal salinities (28, 32, and 36 ppt) and types of diets (Diet A: 100% live feed; Diet B: 100% FRIPPAK; Diet C: a combination of Diet A and Diet C, 50 % each) toward the fullness of gut and gut evacuation time of the newly introduced Penaeus merguiensis larvae culture. The result showed that the longest gut evacuation time and the highest percentage of gut's fullness were found in all Zoea reared with Diet A at salinity 28 and 32 ppt; Zoea-1 at 28 ppt with Diet A; Zoea-2 at 32 ppt with Diet A; Zoea-3 at 32 ppt with Diet A. Longer gut evacuation time would have an impact on the higher percentage of the fullness of gut. The higher fullness of the gut also indicates that the larvae have the best capacity to produce energy and achieve optimum growth.
Teknik Setting Spora Gracilaria gigas Sebagai Penyedia Benih Unggul dalam Budidaya Rumput Laut Ervia Yudiati; Endang Sri Susilo; Chrisna A Suryono
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 9, No 1 (2004): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (161.922 KB) | DOI: 10.14710/ik.ijms.9.1.37-40

Abstract

Rumput laut Gracilaria gigas dapat dikembangkan melalui cara generatif dengan cara menumbuhkan spora hingga menjadi thalus dengan teknik setting spora. Tujuan dari penelitian ini adalah mencari media yangtepat untuk tumbuhnya spora hingga menjadi thallus muda. Rancangan yang digunakan adalah rancangan acak lengkap dengan perlakuan media tempat melekatnya spora hingga menjadi thallus muda adalah talirafia, tali nilon, tali ijuk dan tali kapas. Hasil yang didapat menunjukan bahwa media yang paling banyak ditumbuhi oleh thalus muda adalah media dati tali rafia dengan kepadatan pertumbuhan 84 ind/cm2 sedangkan yang paling sedikit adalah media dari tali kapas dengan kepadatan pertumbuhan 24 ind/cm2.Kata kunci : Gracilaria gigas, setting spora, thallus, mediaSeaweed of Gracilaria gigas has developed by generative method with the concept to growing spores to be young thallus on the substrates. The aim of the research is to find the substrate which has comfortable sporesstick on to be young thallus. Randomized design was used in these experiment with four kind of rope (raffia, nylon, palm fiber and cotton) as a substrates. The highest number of young thallus was grew on raffia rope as substrate and the lowest was on cotton rope as a substrate.Key words : Gracilaria gigas, spora setting, thallus, media
Kandungan Klorofil-a pada Diatome Epipelik di Sedimen Ekosistem Mangrove Edi Wibowo; Ervia Yudiati; Suryono Suryono; Tika Retnowati
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 9, No 4 (2004): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (111.661 KB) | DOI: 10.14710/ik.ijms.9.4.125-129

Abstract

Diatom Epipelik memiliki arti penting dalam sedimen mangrove karena merupakan komponen utama mikroalga yang mengandung klorofil, sehingga klorofil dalam sedimen akan mempengaruhi produktivitas primernya. Nilai kandungan klorofil -a dalam sedimen di kedalaman 2 cm berkisar antara 0,125 - 0,405 μg/cm3 menunjukkan bahwa pada kedalaman 2 cm mempunyai kandungan klorofil -a tertinggi bila dibandingkan pada kedalaman sampling 4 cm ataupun 6 cm. Untuk parameter fisika - kimia oseanografi, kondisi lingkungan memiliki kecenderungan yang normal.Kata kunci : klorofil -a, sedimen mangrove, produktivitas primer.The result showed that Epipelic Diatom have an important role in mangrove sediment, since they are known as major component of microalgae which containt chlorophy. These chlorophyll influence the level of primary productivity, within the sediment. The highest chloropyll a content within sediment was found in those taken from 2 cm deep range, compared with those taken from 4 cm and 6 cm deep.Key words : Chlorophyll -a, mangrove sediment, primary productivity.
Improving Production, Chlorophyll a and Carotenoids Contents of Gracilaria sp. with Liquid Organic Fertilizer from Alginate Waste Ervia Yudiati; Ali Djunaedi; Dea Shinta Kharisma Adziana; Ayunda Ainun Nisa; Rabia Alghazeer
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 26, No 1 (2021): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.26.1.1-6

Abstract

Chlorophyll is a photosynthetic pigment, used in the food sector as a natural dye in food. Carotenoids is used in the health sector to prevent several disease in humans. The production and pigment contents are influenced by nutrient availability. The aim of this study was to increase the production of chlorophyll a and carotenoids contents in Gracilaria sp. Seaweed obtained from Demak aquaculture ponds, then cultivated in aquarium for 28 days.Alginate from Sargassum sp. waste fertilizer was prepared by adding some compounds, fermented by commercial Saccharomyces cerevisiae. Five different treatments (FB (basal formulation: 75 g alginate waste + 22.5mL molase + 7.5 g S. cerevisiae + 250 mL aquadest)), FBL (basal formulation+100% Lamtoro leaves), FBLU (basal formulation+50%Lamtoro leaves+50% carapace shrimp waste), FBU (Basal formulation + 100% carapace shrimp waste) and control-without fertilizer) was applied. Analysis of pigments was determined using the spectrophotometric method. The research design was CRD with 4 treatments and a control. Data were analyzed using Kruskal-Wallis statistical analysis. The result showed that fertilization in culture media could increase the production (DW) and pigment contents. The highest levels of dry weight, chlorophyll a and carotenoids (P<0.05) were resulted from FBLU ie. 6.58 ± 0.07g dry weight; 5.47 mg.L-1 and 0.16 µmol.L-1.The application of organic fertilizer from alginate extract waste to Gracilaria sp. culture media had a significant effect towards growth, dry weight, chlorophyll a and carotenoids pigments content. This inexpensive fertilizer expected to be the solution of green and zero waste management which provide the enviromentally friendly fertilizer.
Oral Administration of Alginate Oligosaccharide from Padina sp. Enhances Tolerance of Oxygen Exposure Stress in Zebrafish (Danio rerio) Ervia Yudiati; Rustadi Rustadi; Fanny Iriany Ginzel; Jelita Rahma Hidayati; Mila Safitri Rizfa; Nuril Azhar; Muhammad Salauddin Ramadhan Djarod; Eny Heriyati; Rabia Alghazeer
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 25, No 1 (2020): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (551.591 KB) | DOI: 10.14710/ik.ijms.25.1.7-14

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Alginate is rich in bioactive compounds and has been known to act as a stimulator on the innate immune system. The objective of this study is to determine polysaccharide and oligosaccharide alginate yield, that percentage inhibition with a different type of extraction, to evaluate growth performance as well as immune response by oxygen stress tolerance. Thermal heating with oven laboratory at 140oC for 4.5 hr was done to breakdown the polysaccharide into oligosaccharide. The extraction was conducted by maceration, filtration, precipitation, and centrifugation. Factorial design with two factors was implemented to 260 Zebrafish and reared in thirteen aquariums (20 fish per aquarium) for 12 days. Zebrafish was fed at different dose (4.0g; 6.0g; 8.0g.kg-1) and different type of extraction [noEDTA/noKCl; KCl; EDTA and (EDTAandKCl)]. The evaluation of radical scavenging activity was done spectrophotometrically at 515 nm. Results showed that the highest alginate yield either polysaccharide or oligosaccharide was gained from KCL treatments, percentage inhibition (82.61%), growth performance as well as tolerance of stress (P<0.05). The best growth performance was reached in oligosaccharide supplementation at 6.0g.kg-1 treatment. It can be concluded that alginate oliogosaccharide produced by thermal heating enhanced the antioxidant activity, boost the fish’s immune system, proofed by better growth performance and more tolerant to the low oxygen stress.
Characterizing the Three Different Alginate Type of Sargassum siliquosum Ervia Yudiati; Alim Isnansetyo
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 1 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (349.989 KB) | DOI: 10.14710/ik.ijms.22.1.7-14

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This research was aimed to identify the brown seaweed, to characterize the acid, sodium and calcium alginate, and to examine the alginate yield. The identification was done phaenotypically. The extraction method was pretreated by ethanol depigmentation, followed by the extraction of Na2CO3/EDTA and CaCl2  and presipitated with absolute ethanol. The characterization of alginate was done by FT-IR spectroscopy and Thin Layer Chromatography by comparing the samples with standard alginate (Sigma, USA). The key of identification  showed that the species was Sargassum siliquosum. There are similarities in signal vibration and TLC spots among the samples and the standard. The TLC test was also showed that those alginates contain mannuronic and guluronic acid. The highest yield was produced by Sodium alginate (40,34% + 0,21), followed by Acid alginate (11,51% + 0,15) and Calcium alginate (4,8% + 0,09). Keywords: alginate, characterization, Sargassum siliquosum, yield
Pengaruh Aplikasi Probiotik Terhadap Laju Sintasan dan Pertumbuhan Tokolan Udang Vanamei (Litopeneus vannamei), Populasi Bakteri Vibrio, serta Kandungan Amoniak dan Bahan Organik Media Budidaya Ervia Yudiati; Zaenal Arifin; Ita Riniatsih
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 15, No 3 (2010): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (145.335 KB) | DOI: 10.14710/ik.ijms.15.3.153-158

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Peningkatan kadar amoniak dan bahan organik pada media budidaya udang vaname (Litopenaeus vannamei) merupakan salah satu faktor yang mempengaruhi keberhasilan budidaya. Penelitian ini bertujuan untuk mengetahui pengaruh pemberian probiotik pengoksidasi amoniak dan bahan organik terhadap laju sintasan hidup dan pertumbuhan tokolan udang vaname, populasi bakteri vibrio serta kandungan amoniak dan bahan organic media budidaya. Penelitian dilakukan menggunakan metode eksperimental laboratories dengan empat perlakuan yaitu perlakuan pemberian 1 ppm  probiotik A (Nitrosomonas eutorpha MPN-8.2, dan Nitrobacter winogradskyi MPN-2), pemberian 0,1 ppm probiotik B (Paracoccus pantotrophus SB 3056 1,5x109cfu/g dan Bacillus megaterium SB 3112 2,5x109cfu/g), pemberian campuran probiotik A dan probiotik B dengan dosis masing masing 1 ppm  dan 0,1 ppm  serta control (tanpa probiotik). Tiap perlakuan diulang sebanyak tiga kali. Kandungan amoniak dan bahan organik dalam air diukur  pada hari ke 0, 15 dan 30. Hasil penelitian menunjukkan bahwa perlakuan pemberian probiotik A, B dan campuran probiotik A dan B berpengaruh : meningkatkan sintasan hidup tokolan udang vanamei yaitu berturut-turut (96%+3,05), (96,66+2,08)%, dan (97,33+1,25)% sedangkan kontrol (90,66 +3,30)%. (2) menurunkan populasi bakteri pathogen Vibrio, serta (3)menurunkan kadar amoniak dan bahan organik.Kata kunci: Litopenaeus vannamei, probiotik, amoniak, total bahan organic, sintasan The enhancement of ammonia and total organic matter level in water medium of vannamei’s (Litopenaeus vannamei) grow out  is one of the major problem.The aims of this research is to find out the effect of survival rate and growth in  vaneme’s juveniles by probiotic addition  This research was done by experimental laboratory with four treatments i.e.  A = juveniles + 1 ppm (Nitrosomonas eutorpha MPN-8.2, and  Nitrobacter  winogradskyi MPN-2 ), B = juveniles + 0,1 ppm (Paracoccus pantotrophus SB 3056 1.5x109cfu/g and Bacillus megaterium SB 3112 2.5x109cfu/g), C = juveniles + 1 ppm (Nitrosomonas eutorpha and Nitrobacter  winogradskyi) + 0,1 ppm (Paracoccus pantotrophus and Bacillus megaterium) and K= juveniles without probiotic addition, respectively. These treatments were replicated in three times. The measurements was regularly done by considering the culture condition. The result shows that those probiotic treatments give the better survival rate i.e. A(96%+3.05), B=(96,66+2.08)%,  C=(97,33+1.25)%  when  caompared  to  the  controle (90.66+3.30)%.  Furthermore,  the pathogenic Vibrio population of probiotic treatments were low when compared to the control. The level of total ammonia and organic matter in control was higher than the probiotic treatments. Key words: Litopenaeus vannamei, probiotics, ammonia, total organic matter
Growth of Mangrove crab Scylla Serrata The Given Different Types of Feed (Pertumbuhan Kepiting Bakau Scylla Serrata Yang Diberi Berbagai Jenis Pakan) Djoko Suprapto; Ita Widowati; Ervia Yudiati; Subandiyono Subandiyono
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 19, No 4 (2014): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (317.19 KB) | DOI: 10.14710/ik.ijms.19.4.202-210

Abstract

Meningkatnya permintaan kepiting untuk ekspor terutama disebabkan kelezatan dan kandungan gizi dagingnya. Namun pada umumnya masih berasal dari hasil tangkapan dari alam, oleh karenanya peningkatan teknologi budidaya sangat penting. Penelitian ini bertujuan untuk mengetahui pengaruh jenis kelamin, jenis pakan dan metode pembesaran terhadap pertumbuhan kepiting.Penelitian dilakukan dengan metode eksperimental, dalam menganalisis pengaruh variable menggunakan rancangan acak kelompok dengan pola faktorial 2x2x3. Laju pertumbuhan mutlak dan pertambahan berat diukur setiap minggu. Hasil penelitian menunjukkan bahwa kepiting jantan dipelihara secara individu dengan pakan ikan mempunyai pertumbuhan mutlak tertinggi yaitu 1,07 g.hari-1 dan pertambahan berat (weight gain) tertinggi pula yaitu 84,73%. Pemeliharaan massal, kepiting betina dengan pakan ikan rucah memiliki laju pertumbuhan mutlak tertinggi yaitu 0,80 g.hari-1. Sedangkan weight gain tertinggi diperoleh pada kepiting jantan yang diberi pakan ikan yaitu 52,03%. Anova tes menunjukkan pengaruh jenis kelamin dan interaksinya berbeda nyata. Hal ini menunjukkan bahwa pertumbuhan kepiting dengan pakan ikan rucah lebih tinggi dibandingkan kepiting dengan pakan kerang dan campuran dari ikan dan kerang. Kepiting jantan yang dipelihara secara individu diberi pakan ikan rucah tumbuh lebih baik dibandingkan kepiting betina. Pertumbuhan Kepiting betina yang dipelihara secara massal dan diberi pakan ikan rucah memiliki peertumbuhan paling tinggi. Kata kunci: pertumbuhan, jenis kelamin, pakan alami, Scylla serrata, wadah pemeliharaan The increase of the export demand of crabs (Scylla serrata), among others caused by the good taste and have a very high nutrition value, but most of the crab still collected by fishing of natural stock. Therefore, technology of crabs culture should be enhanced. This research was aiming to understand the influence of sexual, feeding regime, environmental factors to the growth rate. This research was conducted experimentally using the randomized block design with factorial pattern 2x2x3. The growth rate and weight gain were measured weekly. The results show that male crab reared in individual aquarium fed by mixed fish revealed the quickest ultimate growth rate i.e. 1.07 g.day-1, as well as achieving the highest weight gain i.e. 84.73%. While in mass rearing method, female crab fed by mixed fish achieved the highest ultimate growth rate ie. 0.8 g.day-1, and the highest weight gain achieved in male crab fed by mixed fish i.e. 52.03%. Anova test reveal that sexual factor and it’s interaction was significantly different. The research conclude that the growth of the crab fed by mixed fish was higher than those fed by bivalve meat or combination of mixed fish with bivalve meat; male crab reared individually and fed with mixed fish revealed has higher growth rate then the female crab; and the growth rate of female crab reared in a mass and fed by mixed fish revealed the highest growth rate. Keywords : growth, sexual, natural feed, Scylla serrata, rearing media
Analisis Kandungan Agar, Pigmen dan Proksimat Rumput Laut Gracilaria sp. pada Reservoir dan Biofilter Tambak Udang Litopenaeus vannamei Ervia Yudiati; Ali Ridlo; Annisa Afifah Nugroho; Sri Sedjati; Lilik Maslukah
Buletin Oseanografi Marina Vol 9, No 2 (2020): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v9i2.29453

Abstract

Gracllaria sp. merupakan rumput laut yang memiliki nilai ekonomis tinggi karena menghasilkan agar. Agar banyak dimanfaatkan dalam bidang industri maupun pangan. Kualitas Gracilaria sp. ditentukan oleh kadar agar, pigmen serta  proksimatnya. Penelitian ini bertujuan untuk mengkaji pengaruh parameter kualitas media tumbuh Gracilaria sp. terhadap biosintesis agar, klorofil a, karoten dan kadar proksimat (protein, karbohidrat, lemak, abu, dan air). Lokasi pengambilan sampel di reservoir dan biofilter tambak udang Vaname (Litopenaeus vannamei). Kondisi lingkungan perairan yang diukur adalah kandungan nitrat dan fosfat, suhu air, salinitas, DO (oksigen terlarut), serta pH (Derajat keasaman). Ekstraksi agar dilakukan dengan metode alkali. Karakterisasi agar menggunakan analisis Fourier Transform Infra Red. Hasil penelitian menunjukkan kandungan agar (31,4 ± 0,42%) pada reservoir lebih baik dibandingkan biofilter. Begitu pula dengan konsentrasi klorofil a (19,61 ± 0,04 mg/g), karotenoid (7,42 ± 0,21 µmol/g) serta kadar protein (15,38 ± 0,27%). Kadar lemak, karbohidrat, air dan abu pada kedua lokasi tidak berbeda nyata. Hasil karakterisasi agar menujukkan keberadaan gugus galaktosa 3,6-anhydro-L-galaktosa. Gracilaria sp. is well known as to has a high economically value, due to the application of the agar content that is used in various industries especially in food industry. The quality of Gracilaria sp. depends on agar and pigment content as well as proximate analysis. This study aimed to investigate the effect of water quality parameter on Gracilaria sp habitats to agar, chlorophyl a, carotene and proximate analysis (protein, carbohydrate, total lipid, ash, water content). Samples were collected from reservoir and biofilter from Litopenaeus vannamei’s waste pond. Water quality parameter measured were nitrate and phosphate, water temperature, salinity, dissolved oxygen (DO) and pH. Agar extraction was done by alkali methods. Agar and its chemical structure were characterized by FT-IR analysis. Results showed that agar content (31.4 ± 0.42%) on reservoir was better than biofilter. Higher results from reservoir samples were also found in chlorophyl a (19.61 ± 0.04 mg/g), carotenoids (7.42 ± 0.21 µmol/g) and protein level (15.38 ± 0.27 %). On the other hand, total lipid, carbohydrate, water and ash content were similar. Based on FT-IR analysis shows that the galactose 3,6-anhydro-L-galactose was present.
Kandungan Protein Spirulina platensis Pada Media Kultur Dengan Konsentrasi Nitrat (KNO3 ) Yang Berbeda Saniyatul Ulya; Sri Sedjati; Ervia Yudiati
Buletin Oseanografi Marina Vol 7, No 2 (2018): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (444.142 KB) | DOI: 10.14710/buloma.v7i2.20109

Abstract

 Spirulina platensis merupakan mikroalga hijau biru yang mengandung nutrisi protein tinggi sehingga banyak digunakan sebagai pakan alami. Pertumbuhan dan kandungan protein mikroalga dipengaruhi oleh beberapa faktor, salah satunya adalah pemberian makronutrien pada media kultur mikroalga. Penelitian ini bertujuan untuk melihat pengaruh pertumbuhan dan kandungan protein pada mikroalga S. platensis dengan pemberian konsentrasi nitrat yang berbeda. Rancangan penelitian yang digunakan adalah rancangan acak blok dengan tiga kali pengulangan. Perlakuan konsentrasi nitrat berbeda yang diberikan adalah 50 ppm, 100 ppm, dan 150 ppm. Perhitungan kepadatan dan pengukuran parameter kualitas air dilakukan setiap hari. Pemanenan dilakukan pada hari ke – empat. Kadar prorein dianalisis dengan menggunakan metode Kjedahl. Hasil penelitian pertumbuhan S. platensis menunjukkan nilai kepadatan sel S. platensis tertinggi pada hari ke – empat berada pada perlakuan C dengan konsentrasi nitrat 150 ppm (169,58 . 103 sel/mm3). Hasil analisis ANOVA menunjukkan bahwa konsentrasi nitrat berpengaruh terhadap pertumbuhan S. platensis (p < 0,05) namun perbedaan konsentrasi nitrat tidak berpengaruh pada kadar protein (p ≥ 0,05). Berdasarkan hasil penelitian dapat disimpulkan bahwa konsentrasi nitrat yang ditambahkan pada media kultur S. platensis berpengaruh terhadap pertumbuhan S. platensis namun tidak berpengaruh pada kandungan proteinnya.  Protein Content of Spirulina platensis in Different Culture Media with Nitrate (KNO3) Concentration Spirulina platensis is green-blue microalgae that contain high protein nutrient and could be used as natural food. Growth and protein content of microalgae are influenced by several factors and one of those is giving macronutrient to microalgae’s culture medium. The purpose of this research is to compare the growth and protein content of the S. platensis with different nitrate consentrations.The research design used was a completely randomized block design with three repetitions. The different nitrate concentration treatments were 50 ppm, 100 ppm and 150 ppm. Determination of density and water quality measurement parameters was done on daily basis. Spirulina platensis was harvested done on fourth day of culture. Protein levels were analyzed by Kjedahl method. The result of the S. platensis growth that the highest density on day fourth in C treatment with 150 ppm nitrate consentration (169,58 . 103 sel/mm3). The result of ANOVA analysis show that the concentration of nitrate affected on S. platensis growth (p < 0,05) but the difference of nitrate concentration wasn’t affected in protein analysis (p ≥ 0,05). Based on the result of this research, it can be concluded that the concentration of nitrate added to the S. platensis culture medium effectively and improved the growth of S. platensis but had no effect on the protein content. 
Co-Authors Abidin Nur II Adella, Alisa Sukma Adha Susanto Adi Santoso Agung Sudaryono Agus Setyawan Agus Trianto Akbar Harahap Alfi Satriadi Alghazeer, Rabia Ali Djunaedi Ali Djunaedi Ali Djunaedi Ali Ridlo Alifia Nabilla Putri Alim Isnansetyo Amalia Rachma Fatchiyyah Ambariyanto Ambariyanto , Ambariyanto Ambariyanto Ambariyanto Ambariyanto Amelia Cahya Angelina Angelina, Amelia Cahya ANIK KUSMIATUN Annisa Afifah Nugroho Arief Taslihan Arumning T. Fauziah Arumning Tias Fauziah Avigail, Yolanda Ayunda Ainun Nisa Azhar, Nuril Azhar, Riza Nur Bambang Yulianto Bambang Yulianto Chika Velita Anindya Yulian Chrisna A Suryono Chrisna Adhi Suryono Chrisna Adi Suryono Danang Ambar Prabowo Dea Shinta Kharisma Adziana Dedi . Dedi Setiawan Delianis Pringgenies Delianis Pringgenies Delianis Pringgenies Desrina Desrina DIAH AYU SATYARI UTAMI Diah Permata Wijayanti Diah Tri OktaviyantI Dieng Widawati Dina Ayu Magfirani Dinny Anjang Sari Diyah Putri Ambarwati Djoko Suprapto Dwi Wulandari Dwi Wulandari Edi Wibowo Endang Sri Susilo Endang Sri Susilo Endang Supriyantini Eny Heriyati Fadhliyah Idris Fanny Iriany Ginzel Girsang, Putri Hutari Gunawan Widi Santosa Gunawan Widi Santosa H. Endrawati Haeruddin Haeruddin Harahap, Akbar Hatim Albasri, Hatim Hilda Ayu Aprilia Hilda Ayu Aprilia Hotnida Junita Situmeang Ighwerb, Mostafa Imhmed Ikhlasul Amal Ilham Ilham Insafitri, I Insani, Liga Ipanna Enggar Irpan Hasibuan Irwani Irwani Ita Karlina Ita Riniatsih Ita Widowati Jelita Rahma Hidayati Johannes Hutabarat Langkah Sembiring Lestari, Raisha Fahmida Dwi Lilik Maslukah Linggar Dirgantara Prasetyo Magfirani, Dina Ayu Mila Safitri Rizfa Mila Safitri Rizfa Mostafa Imhmed Ighwerb Muhammad Salauddin Ramadhan Djarod Muhammad Salauddin Ramadhan Djarod Muhammad Syaifudien Bahry Muhammad Syaifudien Bahry Natasya Erdza Aulia Nuril Azhar Nuril Azhar Nuril Azhar Patria Ami Wijaya Puji Norbawa Putri Hutari Girsang Rabia Alghazeer Rabia Alghazeer Rabia Alghazeer Raden Bagus Sugio Sumanta Rahman Rahman Rani Agustian Rani Agustian Rizkina Rani Agustian Rizkina Retno Hartati Ria Azizah T.N. Ria Azizah Tri Nuraeni Rini Widiyadmi Rudhi Pribadi Rustadi Rustadi Saniyatul Ulya Sari, Alfianisa Permata Sarjito - Sarjito . Shofa Farihah Simanjuntak, Sri Devi Sri Devi Simanjuntak Sri Sedjati Sri Sedjati Sri Sedjati Sri Sejati Subagiyo Subagiyo Subagiyo Subagiyo Sunarsih Sunarsih Sunaryo Sunaryo Suryono Suryono Suryono Suryono Suryono Suryono Szuzter, Brian Walter The Michael Febrian Wijaya Tika Retnowati Triyanto Triyanto Valentina R. Iriani Wahyu Wahyu Widianingsih Widianingsih Widianingsih Widianingsih Wijaya, Patria Ami Yolanda Avigail Yulius Docang Casessar Zaenal Arifin Zaenal Arifin Zaenal Arifin Zaneb M. Ben Mansur