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Evaluation of the Potential of Sea Lettuce (Ulva lactuca), Sea Grapes (Caulerpa lentillifera), Blanket Algae (Cladophora sp.), and Red Algae (Gracilaria sp.)

Organization(s):Princess Chulabhorn Science High School Trang
Country:Thailand
Student(s):Mr. Kanakom khaorueang Miss Chonchanok Chuaimit Miss Raweepat Rodroo
Grade Level:Secondary School (grades 9-12, ages 14-18)
GLOBE Member(s):SIRIKWAN NUPHUTI
Contributors:
Report Type(s):Virtual Science Symposium Report
Protocols:pH, Dissolved Oxygen, Nitrates, Salinity
Presentation Video: View Video
Presentation Poster: View Document
Language(s):English
Date Submitted:2026-01-30
Figure show Algae for the Treatment of Shrimp Pond Wastewater.
This research aimed to compare the wastewater treatment efficiency and growth rates of four macroalgae species: Sea Lettuce (Ulva lactuca), Sea Grapes (Caulerpa lentillifera), Gracilaria (Gracilaria sp.), and Green Thread Algae (Cladophora sp.). Following the GLOBE Program protocols, the experiment utilized a Completely Randomized Design (CRD) with four treatments and three replicates. Each unit contained 20 grams of initial biomass in 14 liters of effluent, with an initial salinity of 26.33 ppt and continuous 24-hour light exposure over an 8-week period.The results indicated that all macroalgae species significantly improved water quality. Green Thread Algae (Cladophora sp.) demonstrated the highest efficiency in chemical pollutant reduction, lowering ammonia levels from 0.6 ppm to 0.1 ppm and nitrite to 0.1 ppm, while achieving the highest dissolved oxygen (DO) level at 10.5 mg/L. Regarding growth, Cladophora sp. showed the maximum biomass increase to 50 grams (a 150% increase), followed by Gracilaria sp. (48.36 grams). Physical parameters shifted during the experiment: pH levels stabilized within the 7.5–8.0 range, while salinity tended to increase across all treatments due to evaporation. In conclusion, Cladophora sp. and Gracilaria sp. are highly suitable species for biological wastewater treatment systems in sustainable marine shrimp farming.


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