Tag biofloc

A recent study at the Federal University of Rio Grande in Brazil showed that it is possible to reduce the C:N ratio in biofloc cultures, to decrease the water volume used and the total suspended solids produced, with resulting savings. 

Los alimentos acuícolas para camarón – vivos, frescos o formulados – no deben ser un punto de entrada de patógenos potenciales para el camarón y/o sus sistemas de cultivo. 

The impact of diseases led some Asian shrimp farming countries to develop biofloc and recirculation aquaculture system (RAS) production technologies. Treating incoming water for culture operations and wastewater treatment are biosecurity measures for disease prevention and control. 

En este estudio se compararon dos tipos de sistemas de cultivo de camarón bajo techo: RAS de aguas claras y sistemas de biofloc. El RAS de aguas claras tuvo la ventaja en la calidad del agua, y el camarón en el tratamiento biofloc tuvo una mayor conversión de alimento. 

Shrimp aquafeeds – live, fresh or formulated – should not be an entry point of potential pathogens to the shrimp and/or to their culture systems. 

This study compared two types of indoor, shrimp culture systems: clear-water RAS and biofloc systems. Clearwater RAS had the edge in water quality, but shrimp in the biofloc treatment had a higher feed conversion ratio. 

A study compared the bioavailability of crude protein and lipid from biofloc meals generated with an activated sludge system using two water sources: wastewater from shrimp experimental culture (BFL-W) and, artificially, using clean seawater (BFL-C). 

Larval shrimp performance (feed conversion and final weight) in a biofloc nursery system improved with both added diatoms (Navicula sp.) and rotifers (Brachionus plicatilis). 

This year’s Aquaculture America in San Antonio, Texas, provided significant learning and networking opportunities. It successfully brought together 14 U.S. aquaculture organizations and more than 1,600 participants from Europe, Asia, Africa and Australia. 

The development of this reactor for the indoor cultivation of non-suspended microalgae like important diatoms such as Amphora spp., and the cellular dry matter values produced in this study will help bio-filming science support the development and improvement of in situ feed supplementation for fish and shrimp ponds, particularly in desert environments. 

Well-designed and managed biofloc technology systems are a viable alternative for production of various species like tilapia, to increase feed efficiency by lowering aquafeed protein requirements and to help reduce or eliminate effluent discharges. 

An R&D trial was conducted with shrimp biofloc technology at a commercial facility in Saudi Arabia. Results indicated that biofloc technology can be effectively applied, with some protocol adjustments, in the KSA’s extreme desert environmental conditions. 

Zero-exchange biofloc systems allow elevated stocking densities and production, but also require more dissolved oxygen and thorough water circulation. A new type of air injector uses only a centrifugal pump to recirculate water while naturally aspirating ambient air. 

The authors performed a study to determine the tolerance of shrimp postlarvae to the crowding effects of high-density stocking in terms of production performance. Postlarvae were stocked in heavily aerated microcosm tanks with biofloc at 1,500; 3,000; 6,000 or 9,000 shrimp/m3. High survival was observed at all densities. Final biomass values increased with higher stocking densities, but there was no significant difference between the 6,000 and 9,000 shrimp/m3 treatments or the 1,500 and 3,000 shrimp/m3 treatments. 

Sodium butyrate has potential as an additive for marine shrimp diets, improving both the balance of intestinal bacterial flora and performance of the shrimp.