Abstract
Gracilaria verrucosa as biofilter can absorb and utilize inorganic nitrogen and phosphorus contained in pollutants for its growth. This research aims to know the ability of G. verrucosa as shrimp pond waste biofilter, to know the difference in the quality of shrimp pond wastewater before and after treatment, and to learn more about the absorption capacity of G. verrucosa capability against shrimp pond wastewater. The experiment was conducted on a laboratory scale using a Completely Randomized Design (CRD) consisting of four treatments with three replications using G. verrucosa of different weights which were 100 g, 150 g, 200 g, and controls. The parameters observed in the study were water quality parameters, seaweed biomass, and seaweed absorption. The results obtained were temperature 27.2–30.1°C, TSS 7–76 mg.L-1, pH 7.42–8.83, salinity 16–18 ppt, DO 1.7–5.3 mg.L-1, biomass 74–210.7 g, ammonia effectively decreased on 10th day by 90%, nitrate on 20th day was 22.2% and phosphate value on 30th day was 20.1%. G. verrucosa absorbed nitrogen (N) 0.08% and phosphorus (P) 0.35%. G. verrucosa is potential as a biofilter and can be used as a species candidate for IMTA system.
Highlights
Shrimp farming activity in the fishpond will produce a significant amount of organic and inorganic materials [18] which produced from residual feed waste, feces, and residual metabolism activity
Gracilaria is a genus of red seaweed which has been utilized in the Integrated Multitrophic Aquaculture system (IMTA system) [1, 7, 17]
The nitrogen (N) content in G. verrucosa tissue increased at the end of the research from 0.14% to 0.18-0.22%
Summary
Shrimp farming activity in the fishpond will produce a significant amount of organic and inorganic (dissolved nitrogen and phosphorus) materials [18] which produced from residual feed waste, feces, and residual metabolism activity. The waste can change sediment composition which triggers eutrophication, and causes water hypoxic or anoxic condition [8, 16]. Aquaculture wastewater which has rich in nutrients is reported to cause blooming phytoplankton [12, 17]. Gracilaria can absorb and extract inorganic material such as dissolves nitrogen and phosphorus [14, 18] within its thallus cells for its growth. This research is aimed to find out the ability of G. verrucosa as biofilter for shrimp pond wastewater to improve its water quality
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