Biofloc System – The Need | Biofloc Technology Benefits Composition and nutritional value of biofloc
The Biofloc system was developed to enhance environmental control over the assembly of aquatic animals. In aquaculture, the foremost influential factors are the value of food (which represents 60% of the entire cost of production) and therefore the most limiting factor is that the availability of water/land. The high population density and therefore the breeding of aquatic animals requires wastewater treatment. The Biofloc system may be a wastewater treatment that has acquired important importance as attention to aquaculture.
The principle of this system is that the generation of the organic process by maintaining a better C: N ratio through the stimulation of heterotrophic microbial growth, which assimilates nitrogenous wastes which will be exploited by spices grown as food. Biofloc technology isn’t only effective within the treatment of waste, but also provides nutrition to the aquatic animal.
The higher C: N is maintained by the addition of a source of carbohydrates (molasses) and water quality is improved by the assembly of microbial protein from top-quality individual cells. In such a condition, dense microorganisms develop and perform as both bioreactors that control water quality and therefore the protein source of food. The immobilization of toxic nitrogen species occurs sooner in bio floc because the expansion rate and microbial production per unit of the heterotrophic substrate are ten times above those of autotrophic nitrifying bacteria. This technology is predicated on the principle of flocculation within the system.
Biofloc technology has been implemented in shrimp farming thanks to its deep housing habit and its resistance to environmental changes. Studies are conducted to gauge larval growth and reproductive performance of shrimp and Nile tilapia. Better reproductive performance was observed in shrimp raised within the biofloc system compared thereto to normal cultivation practices. Similarly, better larval growth performance was also observed.
Composition and nutritional value of biofloc
Biofloc may be a heterogeneous aggregate of suspended particles and a spread of microorganisms related to extracellular polymeric substances. it’s composed of microorganisms like bacteria, algae, fungi, invertebrates, and debris, etc. it’s a protein-rich live food formed as a result of the conversion of unused food and excreta into a natural food during a culture system exposed to sunlight. Each floc is held together during a loose mucus matrix that’s secreted by bacteria and linked by filamentous microorganisms or electrostatic attraction. Large flocs are often seen with the eye, but most are microscopic. the dimensions of the floc vary from 50 to 200 microns.
A good nutritional value is found in biofloc. The dry weight protein varies from 25 to 50 percent, fat varies from 0.5 to fifteen percent. it’s an honest source of vitamins and minerals, particularly phosphorus. It also has an impact almost like probiotics. Dry biofloc is proposed as an ingredient to exchange fishmeal or soy in food. The nutritional quality is good; however, there are only limited qualities available. additionally, the profitability of manufacturing and drying biofloc solids on a billboard scale may be a challenge.
Benefits of the Biofloc cultivation system
• Ecological culture system.
• Reduces the environmental impact.
• Improves the efficiency of land and water use.
• Limited or zero water exchange
• Increased productivity (improves survival rate, growth performance, feed conversion in fish farming systems).
• Greater biosecurity.
• Reduces pollution and therefore the risk of introduction and spread of pathogens.
• Profitable feed production.
• Reduces the utilization of protein foods and therefore the cost of ordinary foods.
• Reduces pressure on capture fisheries, that is, the utilization of cheaper fish and junk fish food for the formulation of fish food.
Disadvantages of Biofloc technology
• The higher energy requirement to combine and aerate
• Reduced reaction time because water respiration rates are high
• Start period required
• Alkalinity Supplement Required
• Greater potential for contamination thanks to nitrate accumulation.
• Inconsistent and seasonal performance for systems exposed to sunlight.