Intensive Zero-Exchange Shrimp Production Systems
- Incorporation of Filtration Technologies to Improve Survival and Growth
Cost effective application of superintensive, biosecure, marine production
systems in the US will depend upon proactive management of culture water quality.
More efficient production practices and effective management of waste materials
from the shrimp aquaculture industry can allow for higher productivity, improved
growth and survival, and pave the way for eventual application away from coastal
areas. These improved production strategies are key factors contributing to
profitability and environmental sustainability. Development of cost-effective
management strategies includes application of mechanical and biological filtration
devices to remove solids and nitrogenous products from culture systems. Accumulation
of these waste products can limit system productivity and negatively impact
cultured animals, increasing the potential for stress, disease and mortality.
Technologies developed to remove solids and maintain concentrations of nitrogenous
waste products within acceptable limits include different types of filters
used alone or in combination with a variety of media types. All of these technologies
have achieved varying degrees of success. While use of expandable granular
biofilters is not new, improvements have been made in the design and composition
of the filtration media. This, in conjunction with an appropriate backwash
regimen encourages attachment and growth of nitrifying bacteria to accomplish
clarification and nitrification in a single unit. The purpose of this study
was to evaluate the effects of biological and mechanical filtration on production
and selected water quality criteria in zero-exchange, biosecure, superintensive
shrimp production systems.