shrimp genotype and environment. Biofloc systems with high stocking
densities, chronic exposure to nitrogenous wastes, high bacterial loads
and high TSS differ from traditional systems. Some of the responses
are under genetic control and it will be possible to select for improved
growth in biofloc systems.
With regards to the efficacy of biofloc in disease mitigation, farm
managers questioned the timing as it takes at least 30-40 days for
biofloc to develop in new systems or 14 days where flocs are transferred
into the pond. However, EMS sometimes occurs as early as 10 days
and before 30 days. Prestarting ponds to develop floc communities
and use of nursery systems were discussed. Although it was clear that
many gaps remain in the scientific application of biofloc technologies
against EMS, the wide ranging presentations and discussions at the
workshop have helped to define research priorities and management
directions.
Browdy suggested research areas that can help to better define
optimal microbial floc communities to meet the needs of farm
managers for exclusion of bacterial pathogens, to target crop growth
and to manage water quality and shrimp health. “There is no magic