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All Journal Indenesian Journal of Tropical Biology Indenesian Journal of Tropical Biology
Muhklis, Alis
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Environmental Science Health Professions Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Social Sciences

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Effects of Light Spectrum Variation on Biomass Development of Caulerpa lentillifera: Pengaruh Variasi Spektrum Cahaya terhadap Perkembangan Biomassa Caulerpa lentillifera Prananda, Muhammad; Muhklis, Alis; Alim, Sahrul
Indonesian Journal of Tropical Biology Vol. 1 No. 3 (2025): December 2025
Publisher : Yayasan Siti Widhatul Faeha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65622/ijtb.v1i3.147

Abstract

Light spectrum plays a crucial role in photosynthesis and biomass development of marine macroalgae. This study aimed to evaluate the effects of different light spectra on biomass development of Caulerpa lentillifera in controlled cultivation systems. Four LED light treatments (white, red, yellow, and green spectra at 3000 lux intensity) were applied using a completely randomized design with three replications over 30 days. Growth parameters including absolute growth, relative growth, specific growth rate (SGR), and biomass residue were measured at 10-day intervals. Results showed that red light produced the highest absolute growth (0.107±0.004 mg), relative growth (2.39±0.15%), and SGR (0.237±0.015% day⁻¹), followed by white light (0.101±0.015 mg, 2.26±0.34%, 0.224±0.034% day⁻¹). All treatments exhibited biphasic growth patterns with peak biomass on day 10, followed by progressive decline. White light maintained the highest biomass residue (64.4±23.3%), while green light showed the lowest performance across all parameters (39.3±3.7%). The superior growth under red light is attributed to optimal absorption by photosystem II at 680 nm wavelength. This study recommends red light for maximizing short-term biomass production and white light for maintaining long-term stability in C. lentillifera cultivation systems.
Growth and Survival of Mytilopsis adamsi During Larval to Early Juvenile Transition Under Different Salinity Conditions: Pertumbuhan dan Kelangsungan Hidup Mytilopsis adamsi Selama Transisi Larva ke Juvenil Awal pada Kondisi Salinitas yang Berbeda Ahyani, Dina; Muhklis, Alis; Priyambodo, Bayu
Indonesian Journal of Tropical Biology Vol. 1 No. 2 (2025): August 2025
Publisher : Yayasan Siti Widhatul Faeha

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Mytilopsis adamsi, a small filter-feeding bivalve mollusk, has become an invasive species cultivated in Indonesia as natural feed for economically valuable crustaceans. This study determined optimal salinity levels for growth and survival of M. adamsi during larval to early juvenile transition. Using a completely randomized design, four salinity treatments (10, 20, 30, and 40 ppt) were tested with three replicates each. Larvae were reared for 28 days with Nannochloropsis sp. and Pavlova lutheri as feed, developing from 50.4 µm to 140.17 ± 6.12 µm. Treatments at 20 and 30 ppt demonstrated optimal performance with identical specific growth rates (SGR) of 3.90% per day. Survival rates showed no significant difference (p > 0.05) between treatments, ranging from 24.6% to 27.8%, with highest values at 40 ppt (27.8 ± 0.4%). Statistical analysis revealed a quadratic relationship for SGR (y = -0.0014x² + 0.0615x + 3.2576, R² = 0.8753) with theoretical optimum at 22.0 ppt. The optimal salinity range for M. adamsi cultivation is 20–30 ppt based on growth performance. These results provide baseline data for commercial cultivation protocols and environmental management strategies.
Effects of Light Spectrum Variation on Biomass Development of Caulerpa lentillifera: Pengaruh Variasi Spektrum Cahaya terhadap Perkembangan Biomassa Caulerpa lentillifera Prananda, Muhammad; Muhklis, Alis; Alim, Sahrul
Indonesian Journal of Tropical Biology Vol. 1 No. 3 (2025): December 2025
Publisher : Yayasan Siti Widhatul Faeha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65622/ijtb.v1i3.147

Abstract

Light spectrum plays a crucial role in photosynthesis and biomass development of marine macroalgae. This study aimed to evaluate the effects of different light spectra on biomass development of Caulerpa lentillifera in controlled cultivation systems. Four LED light treatments (white, red, yellow, and green spectra at 3000 lux intensity) were applied using a completely randomized design with three replications over 30 days. Growth parameters including absolute growth, relative growth, specific growth rate (SGR), and biomass residue were measured at 10-day intervals. Results showed that red light produced the highest absolute growth (0.107±0.004 mg), relative growth (2.39±0.15%), and SGR (0.237±0.015% day⁻¹), followed by white light (0.101±0.015 mg, 2.26±0.34%, 0.224±0.034% day⁻¹). All treatments exhibited biphasic growth patterns with peak biomass on day 10, followed by progressive decline. White light maintained the highest biomass residue (64.4±23.3%), while green light showed the lowest performance across all parameters (39.3±3.7%). The superior growth under red light is attributed to optimal absorption by photosystem II at 680 nm wavelength. This study recommends red light for maximizing short-term biomass production and white light for maintaining long-term stability in C. lentillifera cultivation systems.
Growth and Survival of Mytilopsis adamsi During Larval to Early Juvenile Transition Under Different Salinity Conditions: Pertumbuhan dan Kelangsungan Hidup Mytilopsis adamsi Selama Transisi Larva ke Juvenil Awal pada Kondisi Salinitas yang Berbeda Ahyani, Dina; Muhklis, Alis; Priyambodo, Bayu
Indonesian Journal of Tropical Biology Vol. 1 No. 2 (2025): August 2025
Publisher : Yayasan Siti Widhatul Faeha

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Mytilopsis adamsi, a small filter-feeding bivalve mollusk, has become an invasive species cultivated in Indonesia as natural feed for economically valuable crustaceans. This study determined optimal salinity levels for growth and survival of M. adamsi during larval to early juvenile transition. Using a completely randomized design, four salinity treatments (10, 20, 30, and 40 ppt) were tested with three replicates each. Larvae were reared for 28 days with Nannochloropsis sp. and Pavlova lutheri as feed, developing from 50.4 µm to 140.17 ± 6.12 µm. Treatments at 20 and 30 ppt demonstrated optimal performance with identical specific growth rates (SGR) of 3.90% per day. Survival rates showed no significant difference (p > 0.05) between treatments, ranging from 24.6% to 27.8%, with highest values at 40 ppt (27.8 ± 0.4%). Statistical analysis revealed a quadratic relationship for SGR (y = -0.0014x² + 0.0615x + 3.2576, R² = 0.8753) with theoretical optimum at 22.0 ppt. The optimal salinity range for M. adamsi cultivation is 20–30 ppt based on growth performance. These results provide baseline data for commercial cultivation protocols and environmental management strategies.
Co-Authors Ahyani, Dina Prananda, Muhammad Priyambodo, Bayu Sahrul Alim