Our Unique Aquaculture Technology

 

"Thousands have lived without love, not one without water" W.H. Auden


GFA unique system overcomes several limiting factors that restrain the output and effectiveness of fish farmers.


The accumulation of inorganic nitrogen and organic waste products in intensive fish culture systems is one of the major limiting factors preventing further intensification. Inorganic nitrogen (especially ammonia and nitrite) is toxic to fish and accumulates in the pond water through excretion of ammonia by the fish and by breakdown of organic solids. Most of the treatment systems used in today's aquaculture facilities are designed to facilitate the growth of nitrifying bacteria which convert ammonia to nitrate. A drawback of the ammonia removal by means of nitrification is the subsequent increase in nitrate in the culture system. High nitrate concentrations ought to be prevented since, at high concentrations, nitrate has a toxic effect of fish and might be converted to nitrite with an even higher toxicity. Daily flushing the ponds at rates of up to 25% of the total system volume is generally practiced to avoid nitrate build up.

However, such a practice often causes considerable environmental impact and is prohibited in many countries due to environmental and public health considerations. With respect to organic waste products, most aquaculture facilities are designed to mechanically remove the organic waste from the culture tank. Often, the concentrated organic waste is discharged from these facilities without post-treatment and this practice together with the discharge of nitrate-rich effluents is considered a major limitation in the development of intensive fish culture systems.

Due to the need for daily water exchange, existing intensive fish culture systems are situated in areas with an ample clean water supply. Thus, for economical reasons concerned with water supply and discharge, culture systems for marine fish (including recirculating systems) are exclusively situated in the vicinity of the sea. Marine fish farming, whether practiced in seacages or in land-based farms, is often subject to intensive public debate as the farms discharge nutrient-rich effluents in coastal waters of often heavily populated areas. Sustainable farming of marine fish is therefore a major challenge in today's aquaculture development.

 

Our system is a zero-discharge and suitable for the culture of freshwater as well as marine edible and ornamental fish. No water exchange takes place and water addition is limited to compensate for evaporation losses only. The system reduces inorganic nitrogen and organic wastes from pond water by means of the induction of several microbial processes among which: (1) fermentation: the conversion of complex organic waste compound to low molecular weight organic compounds, (2) nitrification: the conversion of ammonia to nitrate and (3) denitrification: the conversion of nitrate to nitrogen gas and the conversion of low molecular weight organic compounds to carbon dioxide.

 

For more information on Denitrification

 

Key Advantages:

• High output- Avg. density of 70 - 100 kg of fish per m³ of water

• Maximum freshness- Within a day from farm to plate

• Zero discharge- No environmental pollution and Bio-Secure

• Produces premium fish- No antibiotics, mercury and lead free fish

• Both saltwater and fresh water

• Grow Fish Anywhere (G.F.A) - Can operate in any climate regardless of the availability of a water resource or proximity to the sea

• Non native - enable the growth of non native fish in any region