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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology METANA Journal of Aquaculture Management and Technology Journal of Marine Research Omni-Akuatika BIOTROPIC The Journal of Tropical Biology Jurnal Perikanan Universitas Gadjah Mada Sains Akuakultur Tropis : Indonesian Journal of Tropical Aquaculture PENA AKUATIKA : JURNAL ILMIAH PERIKANAN DAN KELAUTAN Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi
Sri Rejeki
Department Of Aquaculture, Diponegoro University, Jl. Prof. Sudarto, SH, Tembalang, Semarang, Indonesia 50275
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The Effectiveness of Three Biofilter Media on Total Ammonia Nitrogen (TAN) Removal and Survival Rate of Tilapia Gift Seeds (Oreochromis niloticus) in Recirculation Aquaculture System Mira Andhika Pierrenia; Sri Rejeki; Dicky Harwanto
Journal Omni-Akuatika Vol 17, No 2 (2021): Omni-Akuatika November
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2021.17.2.899

Abstract

Efforts to increase tilapia production are carried out through intensive culture by taking into account various aspects that support fish survival. The culture system that supports intensive culture is the Recirculation Aquaculture System (RAS). The RAS technology has the ability to support aquaculture with very high density and high yields compared to open culture systems. This study aims to determine the effect of different biofilter media in RAS on decreasing TAN concentration and growth of tilapia seeds. The method used was experimental with three treatments and four replications. Tilapia with an average individual weight of 3.40 ± 0.15 g were maintained in RAS with three different biofilter media treatments, sand (A), polystyrene microbeads (B) and kaldnes (C). The parameters observed were pH, DO, temperature, TAN removal efficiency, specific growth rate (SGR) and survival rate (SR). The results showed that different biofilter media had a significant effect (P <0.05) on the TAN removal efficiency value but had no significant effect (P> 0.05) on the SGR and SR values. The sand biofilter treatment (A) gave the best TAN removal efficiency of 36.61±4.82%.Key words: Kaldnes, Polystyrene, Sand, TAN, Tilapia
Studi Populasi Ikan Beloso (Oxyurichthys microlepis) Di Perairan Morosari Kec. Sayung, Demak Dian Sari Maisaroh; Sri Rejeki; Muhammad Zainuri
Biotropic : The Journal of Tropical Biology Vol. 4 No. 1 (2020): Biotropic, Volume 4 Nomor 1, 2020
Publisher : Program Studi Biologi, Fakultas Sains dan Teknologi, Universitas Islam Negeri Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1045.136 KB) | DOI: 10.29080/biotropic.2020.4.1.29-39

Abstract

This study aims to study population of beloso fish. The research was conducted between May-June 2010 at Morosari Waters Area, District SayungDemak. Beloso fish catches are measured standard length, total length and weight. The data analysis suchgrowth was using Von Bertalanffy, length - weight relationship, conditional factor and, food and feeding habits.Growthof beloso fish(O. microlepis) in Morosari waters area has a value of L ∞ of 13,49cm by the equation L(t) = 13,49 ( 1 - exp 0,0175 (t-1,9053)) for length,while based on the weight obtained for W ∞ 128,33 grams with the equation W(t) = 128,33 ( 1 - exp -0,003 (t-2,4312))3. Length-weight relationship beloso fish have value of b1,451 in the Morosari waters area. This value indicates that the growth of beloso fish is negative allometric, which the addition of lengthis faster than its weight. Based on data calculations of beloso fish condition factor in the Morosari waters shows the range of condition factors from 0,0965 to 0,3661, which are preferred food energy accretion term. Beloso fish areomnivorous fish that consume phytoplankton, zooplankton, and detritus as food found in the Morosari estuary.
Pengaruh Pemberian Copepoda Tunggal dan Kombinasi terhadap Kelulushidupan Kuda Laut (Hippocampus kuda) Sri Rejeki
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 12, No 1 (2007): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (171.156 KB) | DOI: 10.14710/ik.ijms.12.1.1-5

Abstract

Tingkat kelulushidupan juwana kuda laut sangat dipengaruhi oleh kesesuaian pakan. Penelitian ini bertujuan untuk mengetahui pengaruh pemberian Copepoda tunggal dan kombinasinya sebagai pakan alami terhadap kelulusan hidupan kuda laut (Hippocampus kuda). Juwana kuda lautyang berumur 1 hari (Dl) dengan padat penebaran 10 ekor/liter dipelihara dengan pemberian pakan copepoda yang berbeda. Percobaan dilakukan dengan Rancangan acak lengkap dengan 8 perlakuan yaitu A. Copepoda mix (campuran berbagai jenis copepoda); B. Acartia sp., C. Oithona sp., D. Tigriopus sp., E. Kombinasi Acartia sp. dan Oithona sp. (1:i); F. Kombinasi Acartia sp. dan Tigriopus sp (1:1); G. Kombinasi Oithona sp. dan Tigriopus sp. (1:1), H. Kombinasi Acartia sp., Oithona sp., dan Tigriopus sp. (1:2:1) masing-masing dengan 3 ulangan. Hasil penelitian menunjukkan bahwa perbedaan jenis copepoda memberikan pengaruh yang nyata (P<0,05) terhadap tingkat kelulushidupan juwana kuda laut. Kelulushidupan tertinggi ditunjukkan oleh juwana yang diberi pakan copepoda kombinasi (1:1) Acartia sp. dan Oithona sp. (AB) yaitu (55± 13,29)% sedang tingkat kelulushidupan terendah ditunjukkan pada pemberian pakan copepoda jenis Acartia sp. (A) yaitu (15±8,66)%. Kata kuncl : kuda laut, Hippocampus kuda, copepoda.The survival of seahorse juvenile is affected not only by water quality but also by suitable feed organism. The research is aimed to determnine the impact of giving copepod as natural food organisms on the survival rateof juvenile seahorse (Hippocampus kuda). Testing animals are juvenile seahorse (Hippocampus kuda) age of one day (D1) with stocking density of 10 indv./liter. Completely Randomised Design was applied with 8treatments and each was triplicated. The treatment of 4 individu/mL are A. Copepod mix (mixed species); B. Acartia sp., C. Oithona sp., D. Tigriopus sp., E. Mixed of Acartia sp. and Oithona sp. ratio of 1:1; F. Mixed of Acartia sp. and Tigriopus sp. ratio of 1:1; G. Mixed of Oithona sp. dan Tigriopus sp. ratio of 1:1, H. Mixed of Acartia sp., Oithona sp., and Tigriopus sp. ratio of 1:2:1. The result of experiment showed thatdifferent species copepods have significantly effect on survival of juvenile seahorse (P<0,05). The highest survival were showed by juvenile seahores given mixed of copepods Acartia sp. and Oithona sp. (AB) i.e.(55±13,29)%. While Acartia sp. (A) gives the lowest survival rate (15±8,66%).Key words: seahorse juvenile, Hippocampus kuda, feed, copepods
Struktur Komunitas Ikan pada Ekosistem Mangrove di Desa Bedono, Sayung, Demak Sri Rejeki; Irwani Irwani; Firdaus Maulana Hisyam
Buletin Oseanografi Marina Vol 2, No 2 (2013): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (250.121 KB) | DOI: 10.14710/buloma.v2i2.6943

Abstract

Pertumbuhan penduduk yang tinggi dan pesatnya kegiatan pembangunan di pesisir bagi berbagai peruntukan (pemukiman, perikanan dan pelabuhan) berdampak dan memberikan tekanan ekologis terhadap ekosistem pesisir, khususnya ekosistem hutan mangrove. Meningkatnya tekanan ini tentunya berdampak terhadap kerusakan ekosistem hutan mangrove itu sendiri baik secara langsung maupun tak langsung. Tujuan dari penelitian ini adalah untuk mengkaji struktur komunitas ikan pada ekosistem mangrove di Desa Bedono, Kecamatan Sayung, Kabupaten Demak. Penelitian ini menggunakan metode penelitian survei deskriptif dan lokasi pengambilan sampel ikan ditentukan dengan metode purposive sampling. Sampel ikan diambil selama delapan minggu menggunakan liftnet. Penelitian ini menemukan sembilan famili ikan yakni Ambassidae , Ariidae, Mugilidae, Tetraodontidae, Phallostethidae, Drepanidae, Gobiidae, Aplocheilidae, dan Syngnathidae. Dengan spesies yang sering ditemukan adalah Mugilidae dan Ambassidae, sementara yang paling sedikit ditemukan adalah Tetraodontidae, Phallostethidae, Drepanidae, Aplocheilidae, dan Syngnathidae. Kata kunci : Struktur Komunitas, Ikan, Mangrove, Bedono
THE ROLE OF SEAWEED (Gracilaria verucosa) IN CO-CULTIVATION WITH TIGER SHRIMP (Penaeus monodon) AS AN ECOLOGICAL INTENSIFICATION Lestari Lakhsmi Widowati; Tita Elfitasari; S Budi Prayitno; Sri Rejeki; Pujiono W Purnomo; Restiana W Ariyati; Roel Bosma
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 16, No 3 (2020): SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijfst.16.3.179-186

Abstract

The use of seaweed as ecological tools for improving environmental condition has been proved to sustain shrimp production. However, adding too much seaweeds caused oxygen depletion and nutritional competition. The objective of this study was to determine the optimum density of G. verucosa for supporting the growth of monodon shrimp. The research was conducted in Tambakbulusan village, Demak Regency with 20 fiber semi outdoor tanks. The tanks were used for the experiment without seaweed and with four densities of seaweed (50, 100, 150 and 200 g.m-2) using hanging rope and were co-cultivated with 80 individuals of post larva (2.0-2.9 g) monodon shrimp in 800 L brackish-water system. The concentration of TAN, NO3, and NO2 were monitored every week, while dissolved oxygen (DO), pH, temperature, and salinity werechecked daily for 30 days. The highest shrimp survival rate (79.75%) and growth rate (6.6%day-1) were obtained in the 100 g.m-2 of G. verucosa, significantly higher than in other treatments. Furthermore, seaweed density has a decreasing effect of NO3 content (g/L) in RL100 from 0.26 to 0.16. and the lowest concentration of NO2 and NO3 were determined. Conversely, the highest density of seaweed (200 g m-2) gave the lowest survival rate of shrimp (53.67%) due to high NO2 content. DO had various values depending on the density and drop to less than 3.5 ppm in the highest density. In all treatments,  pH, temperature and salinity werein a good range for shrimp culture. Thus, 100 g.m-2 of seaweed was optimal for ensuring the function as nutrient removal in shrimp co-culture.
EFISIENSI PRODUKSI RUMPUT LAUT E. cotonii DENGAN METODE BUDIDAYA LONG LINE VERTIKAL SEBAGAI ALTERNATIF PEMANFAATAN KOLOM AIR Lestari Lakhsmi Widowati; Sri Rejeki; Tristiana Yuniarti; Restiana Wisnu Ariyati
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 11, No 1 (2015): JURNAL SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.585 KB) | DOI: 10.14710/ijfst.11.1.47-56

Abstract

ABSTRAK   Kualitas dan kuantitas rumput laut yang baik dan berkelanjutan merupakan hal yang masih menjadi tantangan bagi usaha budidaya. Metode budidaya danlama pemeliharaan yang tepat diharapkan dapat menjadi salah satu solusi untuk menghasilkan kuantitas dan kualitas budidaya yang berkelanjutan.Metode long line vertikal diterapkan untuk mengetahui kolom air yang dapat digunakan untuk pertumbuhan optimum rumput laut. Kualitas terbaik kandungan karaginan dilihat dari lama pemeliharaan. Tujuan penelitian adalah (1) Mengetahui interaksi lama pemeliharaan  dan  kedalaman terhadap produksi biomassa dan kualitas rumput laut. (2) Mengetahui lama pemeliharaan  dan  kedalaman yang terbaik terhadap produksi biomassa dan kualitas rumput laut. (3) Mengetahui kedalaman kolom air yang masih menghasilkan pertumbuhan rumput laut secara optimal. Penelitian dilakukan di perairan laut Pulau Pasir Kabupaten Brebes dengan lama pemeliharaan 45 hari dan 60 hari, serta 3 perlakuan pada kedalaman 30 cm, 60 cm, dan 90cm. Masing-masing perlakuan diulang 3 kali. Rancangan penelitian yang digunakan adalah rancangan faktorial 2 x 3. Variabel yang diamati adalah laju pertumbuhan dan kandungan karaginan.Hasil yang didapatkan yaitu laju pertumbuhan selama 45 hari pada kedalaman 30 cm, 60 cm dan 90 cm berturut-turut adalah 117%, 158%, 111%, dan pada pemeliharaan selama 60 hari adalah 198%, 182% dan 136%. Pada pemeliharaan 45 hari laju pertumbuhan harian pada kedalaman 30 cm, 60 cm dan 90 cm berturut-turut adalah 2,26%/hari, 2,10%/hari dan 1,66%/hari, dan pada pemeliharaan 60 hari adalah 1,82%/hari, 1,73%/hari dan 1,43%/hari. Dari segi kualitas dilihat pada kandungan karaginan menghasilkan rata-rata karaginan 76,3% pada pemeliharaan 45 hari dan 96,3% pada pemeliharaan selama 60 hari. Kesimpulan yang diambil alah bahwa (1) Kedalaman dan lama pemeliharaan  memberikan pengaruh terhadap produksi biomassa dan kandungan karaginan rumput laut. (2) Produksi biomassa tertinggi dihasilkan pada pemeliharaan selama 45 hari pada kedalaman 30 cm dengan pertumbuhan harian 2,26 %/hari dan kedalaman 60 cm  dengan laju pertumbuhan 2,10 %/hari. Kandungan karaginan rata-rata sebesar 96,3% didapatkan pada pemeliharaan selama 60 hari. (3) Kedalaman optimal untuk pemeliharaan rumput laut dengan metode longline vertikal adalah sampai dengan 60cm.   Kata kunci : long line vertikal, E. cottoni, karaginan   ABSTRACT   Good quality, quantity and sustainable still a challenge for aquaculture. The right method and duration of cultivation is expected to be one of the solutions to produce a sustainable quantity and quality of seaweed culture. Long line vertical method is applied to find out the column of water that can be used for optimum growth of seaweed. The best quality of carrageenan content was observed in duration of cultivation. The purpose of the study was (1) To find out the interaction between duration of cultivation and depth for the production of biomass and quality of seaweed. (2) To know the best duration of cultivation and depth for production of biomass and quality of seaweed. (3) To find out the depth of the water column which still produces the growth of seaweed optimally. Research conducted in sea water at Pulau Pasir, Brebes Regency with duration of cultivation were 45 days and 60 days, with 3 treatments at thedepth of 30cm, 60cm, and 90cm . Each treatment was repeated three times. The research used 3 x 2 factorial design. The observed variablewere growth rate and carrageenan content. The results are obtained, relative growth rate for 45 days at a depth of 30 cm, 60 cm and 90 cm was 117%, 170%, 110%, and for duration of cultivation  60 days was 187%, 185% and 136%. In 45 days duration of cultivation, the  of specific growth rate at depth of 30 cm, 60 cm and 90 cm was 2.26%/day, 2.10%/day and 1.66%/day, and on duration of cultivation 60 days is 1.82%/day, 1.73% and 1.43%/day. In terms of the quality of seaweed the average of karaginan content was 76.3% in 45 days duration of cultivation  and 96.3% on 60 days duration of cultivation . The conclusions were (1) The depth and period of cultivation influence the production of biomass and karaginan content of seaweed. (2 The highest biomass production on 45 days period of cultivation at a depth of 30 cm with specific growth rate of 2.26%/day and in depth of 60 cm with specific growth rate of 2.10%/day The content of carageenan an average of 96.3% obtained on maintenance for 60 days. Optimal depth for the maintenance of seaweed with vertical longline method is up to 60 cm.  Keywords : long line vertikal, E. cottoni, karaginan 
EVALUASI KELAYAKAN USAHA BUDIDAYA IKAN BANDENG (Chanos chanos) SECARA SEMI INTENSIF DI KECAMATAN ULUJAMI, KABUPATEN PEMALANG Rizky Handayani; Sri Rejeki; Tita Elfitasari
Sains Akuakultur Tropis : Indonesian Journal of Tropical Aquaculture Vol 3, No 1 (2019): SAT edisi Maret
Publisher : Departemen Akuakultur FPIK UNDIP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (55.193 KB) | DOI: 10.14710/sat.v3i1.2991

Abstract

Milkfish is one of the most widely cultivated fish species in Indonesia. The development of milkfish cultivation technology in the community is inseparable from its comparative and strategic advantages because milkfish can be cultivated in brackish water, sea water and even freshwater and tolerant to environmental quality changes. Technology of cultivation and seeding has been done by the community. Milkfish is not susceptible to disease. The prospect of the development of milkfish breeding business in Ulujami District has good potential due to market demand. The purpose of this research is to know the technical aspect, financial aspect, and business feasibility of milkfish cultivation in Ulujami District. This research method is interview that is using questionnaire for data retrieval. The problems that arise in the breeding business of milkfish enlargement is how the efforts to obtain good and profitable results in fulfilling the market demand by spending as less as possible because it affects the profitability of the milkfish farmer income. Data analysis methods are obtained from Payback Period (PP), which is located in Limbangan Village 0.34, Mojo Village 0.98 and Pesantren Village 5.85. Net Present Value (NPV), the farmer's NPV value is positiv.  Benefit Cost Ratio (B / C Ratio) of each village are 2.35 and 4. Results and conclusions are obtained based on the technical aspects of site selection, maintenance, milkfish harvesting and financial aspects of business feasibility it this worth to be. Keywords: Business Feasibility Evaluation, Cultivator In Ulujami District
PERFORMA PERTUMBUHAN UDANG WINDU (Penaeus monodon) YANG DIBUDIDAYAKAN BERSAMA KERANG HIJAU (Perna viridis) DENGAN SISTEM IMTA Chlara Evania; Sri Rejeki; Restiana Wisnu Aryati
Sains Akuakultur Tropis : Indonesian Journal of Tropical Aquaculture Vol 2, No 2 (2018): SAT edisi September
Publisher : Departemen Akuakultur FPIK UNDIP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/sat.v2i2.2984

Abstract

ABSTRACT                             Integrated Multi-Tropic Aquaculture (IMTA) is a cultivation system in which organic waste from cultivation activities can be utilized by other biota in one container so as to reduce the environmental impact of cultivation activities. Organic waste can be utilized as the growth of phytoplankton which will be used other biota as natural food. This research is focused on the species of tiger shrimp (P. monodon) as the main cultivated commodity, while the green mussels (P. viridis) is one of the biota that can utilize the phytoplankton that flourish because of organic waste in the waters. The purpose of the study is to determine the effect of green mussel stock density on the growth and survival rate of tiger shrimp with IMTA system. The tiger shrimp used were stadia postlarvae (PL30) with size 0.11 - 0.14 gram /shrimp. The stocking density is 80 tiger shrimps per container with 1m2 container size. This study used a complete randomized design study (RAL) with 5 treatments and 3 replications. The stocking density of the green mussel being used as treatment are 0, 30, 45, 60, and 70 green mussels per container. The results showed that the average growth rate of tiger shrimp in treatment A (with stocking density of 0 green mussels) was 22,06±0,18%/day, treatment B (with stocking density of 30 green mussels) was 28.89±0.20%/day, treatment C (with stocking density of 45 green mussels) was 27.09±0.20%/day, treatment D (with stocking density of 60 green mussels) was 25.32±0.21%/day and treatment E (with stocking density of 75 green mussels) was 23.92±0.12%/day. The average value of tiger shrimp survival rate on B was 80.00%, A was 78.33%, C was 77.92%, D was 74.58% and E was 61.25%. The best green mussels stocking density for tiger shrimp growth and survival rate is with stocking density of 30 green mussels (treatment B). Keyword: Growth, Survival Rate, Green Mussel, Tiger Shrimp, IMTA
PERFORMA PERTUMBUHAN UDANG WINDU (Penaeus monodon) YANG DIBUDIDAYAKAN BERSAMA RUMPUT LAUT (Gracilaria sp.) DENGAN PADAT TEBAR YANG BERBEDA MENERAPKAN SISTEM INTEGRATED MULTI-TROPHIC AQUACULTURE (IMTA) Irma Azizah; Sri Rejeki; Restiana Wisnu Aryati
Sains Akuakultur Tropis : Indonesian Journal of Tropical Aquaculture Vol 2, No 2 (2018): SAT edisi September
Publisher : Departemen Akuakultur FPIK UNDIP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/sat.v2i2.2725

Abstract

Tiger shrimp is a commodity pond that has high economic value compared to others. Tiger shrimp culture can be done by using a monoculture system, a polyculture system or an Integrated Multi-trophic Aquaculture (IMTA) system. IMTA system is one solution to reduce the environmental impact of cultivation activities because undigested feed and metabolism results in an accumulation of feces in the pond. This study aims to determine the effect of the addition of seaweed into the system on the growth and survival rate of tiger shrimp and also to determine the best density of seaweed in controlling the water quality. The research was conducted from September 2017 to November 2017 in Tambak Bulusan Village, Demak, Central Java. The material used is seaweed. Tiger shrimp used in size PL 30 measuring 2.0-2.9 cm. In length the stocking density is 80 individuals/m. The feed used is pellets given by using a fixed feeding rate of 5%. This research used an experimental method with complete randomized design with 5 treatments and 3 replications. The treatment of seaweed stocking used is 50 g, 100 g, 150 g, and 200 g. The results showed that different stocking of seaweed had significant effect on growth of weight, relative growth rate, survival rate of tiger shrimp. The best treatment of seaweed density is treatment  A1 (50 gram), treatment A1 can increase the value of tiger shrimp growth with absolute weight of 1.67 ± 0.05 gram; the relative growth rate of 36.36 ± 1.04 %; and the survival rate of 78.75 ± 1.25 %. While the best growth value of seaweed is at treatment A1 (50 gram) with weight growth value of 73,21 ± 4,26 gram, and daily growth rate of 2,15 ± 0,08 %/day. Seaweed can balance the quality of waters with the results of nitrate water quality of 0.02 mg / L - 0.08 mg / L, nitrites of 0.00 - 0.42 mg / l, and ammonia levels of 0.02 - 0.59 mg / l. The results are quite feasible for shrimp farming activities.Keywords: growth, Penaeus monodon, Gracilaria sp., IMTA    
Pengaruh Salinitas yang Berbeda Terhadap Efektivitas Penyerapan Nitrat dan Pertumbuhan (Gracilaria verrucosa) Dari Air Limbah Budidaya Ikan Kerapu Sistem (Epinephelus) Sistem Intensif Dhimas Andreyan; Sri Rejeki; Restiana Wisnu Ariyati; Lestari L. Widowati; Rosa Amalia
Sains Akuakultur Tropis : Indonesian Journal of Tropical Aquaculture Vol 5, No 2 (2021): SAT edisi September
Publisher : Departemen Akuakultur FPIK UNDIP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/sat.v5i2.7282

Abstract

Rumput laut merupakan salah satu komoditi perikanan yang memiliki nilai ekonomis tinggi, karena pemanfaatannya yang demikian luas, baik dalam kehidupan sehari-hari maupun dalam dunia industri. Salinitas merupakan faktor kimia yang mempengaruhi sifat fisik air, diantaranya adalah tekanan osmotik yang ada pada rumput laut dengan cairan yang ada dilingkungan. Nitrat merupakan salah satu unsur yang dibutuhkan untuk pertumbuhan dan (G.verrucosa) sangat sensitif terhadap konsentrasi nitrogen yang rendah.  Penelitian ini bertujuan untuk mengetahui pengaruh salinitas yang berbeda terhadap pertumbuhan rumput laut (G. verrucosa) yang memberikan pertumbuhan terbaik dan penyerapan laju nitrat.. Penelitian dilaksanakan pada bulan Februari-April 2019 di PT Indmira Yogyakarta. Rancangan percobaan yang digunakan yaitu Rancangan Acak Lengkap dengan 4 perlakuan dan 3 pengulangan, dimana A (20 ppt), B (25 ppt), C (30 ppt), D (35 ppt). Nilai laju pertumbuhan spesifik (SGR) dan laju penyerapan nitrat ditentukan setelah 42 hari pemeliharaan. Nilai SGR dianalisis menggunakan ANOVA dan dilanjutkan dengan Uji Duncan. Berdasarkan hasil penelitian, laju pertumbuhan spesifik (SGR) tertinggi adalah perlakuan A sebesar 2,78±0,08%/hari, sedangkan nilai laju penyerapan nitrat yang terbaik pada perlakuan B sebesar 0,0105±0,001 mg/g dan puncak laju penyerapan nitrat tertinggi saat 21 hari awal masa pemeliharaan rumput laut sebesar 0,6 mg/l. Hasil pengukuran kualitas air yang diperoleh menunjukkan bahwa kualitas air pada lokasi penelitian berada dalam kisaran yang masih dapat ditoleransi oleh rumput laut.
Co-Authors Alfabetian Harjuno Condro Haditomo Ana Yuliyana Andi Sagita Arief Budianto Asriani Atika Dewi Bahari Sony Atmaja Bima Anggara Putra Chlara Evania Citra Ayu Furi Devinda Arsandi Dewi Nurfebriani Nurfebriani Dhimas Andreyan Dicky Harwanto Didik Wisnu Widjajanto Diyah Retnosari Edi Wibowo Kushartono Ely Sufriyanti Ginting Fahmi Royan Fajar Basuki Fajar Basuki Firdaus Maulana Hisyam Heny Kusumayanti Iis Dahlia Iman Ihsanudin Indah Susilowati Irma Azizah Irwani Irwani Johannes Hutabarat Lestari L. Widowati Lestari Lakhsmi Widowati Lestari Lakhsmi Widowati Maisaroh, Dian Sari Mira Andhika Pierrenia Mohammad Aris Ni&#039;matulloh Mohammad Zaenuddin Luthfi Muhamad Fikri Muhammad Rizky Hasan Muhammad Zainuri Muhammad Zulfa Zain Nindya Kharisma Mahardhika Puguh Karisma Ferry Setyawan Pujiono W Purnomo Rahmat Kurniawan Pasaribu Restiana W Ariyati Restiana Wisnu Ariyati Restiana Wisnu Aryati Restiana Wisnu Aryati Restiana Wisnu Aryati Ristiawan Agung Nugroho Rizky Handayani Roel Bosma Rosa Amalia S Budi Prayitno Saesar Agung Trawanda Sarah Nur Iskandar Tegar Abdul Basith Tita Elfitasari Tita Elfitasari Titik Susilowati Tri Winarni Agustini Tri Winarni Agustini Tristiana Yuniarti