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All Journal Acta Aquatica: Aquatic Sciences Journal Jurnal Perikanan
Siti Mira Rahayu
Program Studi Teknologi Pengelolaan Sumberdaya Perairan, Politeknik Ahli Usaha Perikanan
Agriculture, Biological Sciences & Forestry Materials Science & Nanotechnology Other

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Variation of nitrate concentration and light level on growth rate of diatom Chaetoceros muelleri Siti Mira Rahayu; Ario Damar; Majariana Krisanti
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Jurnal Ilmu Perairan, Vol. 9: No. 2 (August, 2022)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v9i2.6789

Abstract

Microalgae are cultured as natural feed for the cultivation of mollusks, crustaceans (early larval stages), and zooplankton. Diatoms are phytoplankton groups commonly used as feed, one of which is Chaetoceros muelleri. This study aims to identify the optimal nitrate concentrations and light level (irradiance) for the growth rate of C. muelleri. Culture was placed in nitrate 1,330; 5,305; and 27,030 mg/L (N1, N2, N3, respectively); and light 50, 100, and 150 µmol/m2/s, with three replications for each treatment. The response variable observed was the growth rate of C. muelleri and nitrate uptake. Each nitrate treatment resulted in a significant difference in the growth rate of C. muelleri (LSD, p  0.01). The N3 treatment produced the highest growth rate (average 0,188-0,193 cells/day), while N1 produced the lowest specific growth rate (average 0,149-0,157 /day). In light treatment, a significant difference was only seen in the light levelof 150 µmol/m2/s (LSD, p 0.05) which produced the highest growth rate (average 0.157-0.193 cells/day), especially in the nitrate N1 and N2. Meanwhile based on the significance test, the interaction between nitrate and light treatment was not significant.Keywords: Chaetoceros muelleri; Growth rate; Irradiance; Nitrate
STRUKTUR KOMUNITAS ECHINODERMATA PADA EKOSISTEM LAMUN DI GILI GEDE, LOMBOK BARAT, NUSA TENGGARA BARAT Darma Prasetio; Ratna Suharti; Hendra Irawan; Aditya Bramana; Meuthia Aula Jabbar; Dadan Zulkifli; Siti Mira Rahayu
Jurnal Perikanan Unram Vol 14 No 1 (2024): JURNAL PERIKANAN
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jp.v14i1.709

Abstract

Ecologically Echinoderms plays a role as a eater of organic waste or detritus originating from animal and plant remains to clean organic waste in the ocean, one of the echinoderm habitats is in the seagrass ecosystem. The aim of this research is to determine seagrass density and abundanceechinoderms, biological index (Diversity, uniformity and dominance) of seagrasses and echinoderms and water conditions. The seagrass and echinoderm data collection method uses a 100 meter perpendicular transect with a 1 x 1 m² quadrant tansec plot toechinoderms and quadrant 50 x 50 cm² for seagrass. Density of seagrass species at station II Halophila ovalis with a value of 1,294.2 ind/m2 and station III of the type Halophila minor, Halodule pinifolia, andSyringodium isoetifolium and station IV typeHalophila ovalis with a specific density of 0 ind/m2. The distribution of echinoderms found at the four observation stations was divided into 18 types from the 5 classes of echinoderms found, the highest type found was at station IV with a total of 588 ind/m² and the lowest was at station III with a total of 85 ind/m².
Co-Authors Aditya Bramana Ario Damar Dadan Zulkifli Darma Prasetio Hendra Irawan Jabbar, Meuthia Aula Majariana Krisanti Ratna Suharti