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All Journal Advances in Tropical Biodiversity and Environmental Sciences
Alfarisi Prafanda
Airlangga University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Environmental Science Immunology & microbiology Medicine & Pharmacology Veterinary Other

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Effectiveness of Algae Growth Promoter on Spesific Growth Rate and Growth Phase of Chaetoceros calcitrans Alfarisi Prafanda; Woro Hastuti Satyantini; Ahmad Shofy Mubarak
Advances in Tropical Biodiversity and Environmental Sciences Vol. 10 No. 2 (2026): June 2026
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2026.v10.i02.p08

Abstract

This research is motivated by efforts to provide high-quality microalgae as natural feed for shrimp hatchery activities. Researchers have used fertilizers with appropriate N/P ratios, including commercial fertilizers. In this study, the author examines the use of the commercial fertilizer Algae Growth Promoter (AGP) as fertilizer in C. calcitrans culture. Current fertilizer use still largely focuses on specific growth rate and increasing microalgal density, which is considered fast, and pays less attention to microalgal nutritional content. The study administered AGP fertilizer (80, 90, 100, 110, 120 ppm) and a control treatment, with 100 ppm modified Guillard fertilizer added, over a culture period from the exponential to the stationary phase. AGP fertilizer reached the stationary phase later, at the 108th observation hour. This is superior to the control treatment, which entered the stationary phase at 72 hours of culture. The control treatment reached the exponential phase earlier, with a td value of 20.29 hours, the shortest doubling time among all treatments. Observations of growth rates were also carried out, where the control treatment was found to have the best specific growth rate, with a µ value of 0.0343 per hour, while the treatment with AGP fertilizer had a specific growth rate with a µ value ranging from 0.0255 to 0.0279 per hour, and the td value ranged between 24.89 and 27.27 hours.
Co-Authors A. Shofy Mubarak Woro Hastuti Satyantini