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Water Quality Improvement in Cold & Cool Water Aquaculture






Poor water quality is a major stress to all aquatic animals. Stresses are additive and increase the susceptibility of the animals to disease while decreasing their growth rate and feed conversion efficiency. To say that antibiotics and bactericidal products are essential is to admit that adequate water quality is not being maintained. It is much easier to prevent diseases than to try to cure them. Disinfectants may help avoid some diseases, but they treat only symptoms and not the cause of the problems. The Bacta-Pur System can help improve water quality, reduce stress to the animals, improve growth and feed conversion and reduce the need for and expenses of drugs.

The beneficial microorganisms in Bacta-Pur biotechnologies convert wastes in ponds into bacterial biomass, producing food for higher life forms including fishes.


Experimental work with fish has shown that use of Bacta-Pur increased production by over 37% (Ehrlich et al. 1991; A diagnostic and ecological approach to the purification of sewage, toxic substances and water bodies; IN: Ecological Engineering for Waste Water Treatment, Proceedings (C. Etnier & B. Guterstam eds) Bokskogen, Box 7048, S-402-31, Gothenburg, Sweden. pp. 95-109). Similar benefits of bacterial augmentation have been found for growth and survival of prawn and crab larvae (Maeda & Nogami, 1989; Some aspects of the biocontrolling method in aquaculture. IN: Current Topics in Marine Biotechnology (S. Miyachi, I. Karube & Y. Ishida, eds), Japan. Soc. Mar. Biotechnol., Tokyo, pp. 395-398). These authors also showed that regular additions of beneficial bacteria reduced pathogens (e.g. Vibrio spp.) in the culture water.

Drugs cannot improve growth and feed conversion efficiency nor can they be used indefinitely to compensate for declining water quality. If proper attention is not paid to the maintenance of good water quality, decreasing returns from fish ponds are inevitable.

The Bacta-Pur biotechnological system can improve water quality in ponds while converting wastes into natural food.

Regular use of Bacta-Pur has also been shown to reduce nitrogen and phosphorus in trout pond effluents.

Biological filtration and water quality improvement can be accelerated, in ponds, with the Bacta-Pur Ecofiltre and the Bacta-Pur Bactivator for Aaquaculture and agriculture



Treatment with the Bacta-Pur System

Bacta-Pur biotechnologies are highly concentrated; the guaranteed minimal cell count exceeds 10x11 cells/mL. Compare this to any other brand, and you will appreciate the concentration of Bacta-Pur products. Small regular doses are very effective.

Ponds are treated with a combination of two biotechnologies (Bacta-Pur N-3000 and Bacta-Pur XLG) and Bacta-Pur CARRIER 1, which transports bacteria through the water column to the sediments. The two biotechnologies work together to produce clearer water, control ammonia and nitrite, remove organic sediments and to convert pollutants into food for invertebrates and fishes.

One L Bacta-Pur XLG & 2 L Bacta-Pur N3000 / 1,000,000 L pond water (1) / week. The application technique consists of preactivating Bacta-Pur XLG for 24 hours; Bacta-Pur ACTIVATORs 1&2 with precise instructions are attached to each bottle. The weekly dose of Bacta-Pur is mixed with 1 kg of Bacta-Pur CARRIER 1(2) per 10 litres of Bacta-Purand stirred for 30 minutes. The mixture is then diluted with 10-100 X the volume of pond water and is sprayed or splashed over the surface of the pond.

Raceways are treated with Bacta-Pur N3000 to control ammonia and nitrite. Phosphorus reduction in effluents has also been reported.

One half litre of Bacta-Pur N3000 is continuously added to each 1,000 m3 (260,000 gal US) of incoming water. Automatic on-site growth and continuous injection of nitrifiers is most easily accomplished with a Bacta-Pur Bactivator.

Settling Ponds are treated with Bacta-Pur XLG to solubilize sludge and remove soluble pollutants.

Four L Bacta-Pur XLG / 1,000,000 L settling pond water(1) / week. The weekly dose of Bacta-Pur XLG is preactivated, mixed with 1 kg of Bacta-Pur CARRIER 1(2) per 10 litres of Bacta-Pur and stirred for 30 minutes. The mixture is then diluted with 10-100 X the volume of pond water and is sprayed or splashed over the surface of the pond.

Calculate pond volume by multiplying the averages of the length, the width, and the depth. 1m3 = 1000 L, 1ft3 = 28.3 L. Other useful conversion factors: 1 kg = 2.2 lb.; 1 L = 0.264 gal US.

An alternative to the use of Bacta-Pur CARRIER 1, in small ponds, is to pump the diluted mixture into the sediments or to simply pour the mixture down a pipe the end of which is resting on the bottom. If the pipe is used the pipe should be flushed with pond water before withdrawing it from the pond. This will assure that the Bacta-Pur is released in the sediments.

To help you evaluate your needs contact us.


Bacteria and Pond Health
Principles of Pond Health Management

Sludge Reduction in Trout Pond
Reduction of Airborne Ammonia in Chicken Barn
Reductions of Solids in Cow Manure
Reduction of BOD and Ammonia in Pig Manure

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