Lingcod stock enhancement under study as management tool in U.S. Pacific Northwest
The authors have begun a project to further investigate stock enhancement as a tool for rebuilding depleted lingcod stocks in Puget Sound in Washington, USA.
Chlorine an effective disinfectant in aquaculture
Ponds should be fertilized a few days after chlorine application to encourage the regrowth of natural food organisms before introducing postlarvae.
Tilapia culture in Lake Kariba, Zimbabwe
Lake Kariba, on the Zambia-Zimbabwe border, has no industry, few people, high-quality freshwater and an average year-round temperature of 27 degrees-C, all features that can support aquaculture.
Temperature fluctuations affect biofilter performance in preliminary study
In a recent study, the authors set up a series of temperature-controlled tanks to determine the effects of temperature variation on biofilter performance.
Advancing shrimp farm technologies support greater efficiencies, sustainability
Todays' shrimp farm technologies include biosecurity protocols, stocking densities according to pond design and aeration levels, and best practices for pond preparation and feed and water management.
The changing face of pond aquaculture in China
Pond aquaculture in China is trending further from traditional carp polyculture toward monoculture of higher-value fish species.
Pond bottom soil analyses
Limit pond soil analyses to soil particle size for use in pond construction decisions, initial analysis of total sulfur, occasional analyses of total nitrogen, and routine analyses of pH and soil organic carbon.
Direct energy use in channel catfish production
The direct energy input values for aquaculture include energy used in constructing facilities, producing seedstock and feed, powering mechanical aerators, applying feed and harvesting and processing culture animals.
Membrane biological reactor technology supports wastewater reclamation reuse
Membrane biological reactor technology is a scalable wastewater treatment system that reclaims water discharged from RAS solids-collection devices.
Carbon dioxide: Waste, nutrient
Carbon dioxide is both a nutrient and a waste product in aquaculture. Some pond managers feel that application of organic matter to provide additional carbon dioxide can reduce pH and control blue-green algae.
Carbon-nitrogen balance impacts nitrogen removal
For aquaculture managers, it is important to control carbon type and carbon-nitrogen ratio by feed formulation, solids removal or addition of organic carbon.
Oxygen sources for aquaculture farms
As stocking density increases in aquaculture systems, supplemental oxygen becomes necessary. Oxygen generation is becoming a popular option.
Iron important to pond water, bottom quality
Iron supplementation of pond fertilizers can improve their effectiveness in promoting phytoplankton growth. Ferrous iron in bottom sediment precipitates hydrogen sulfide gas produced by microbial activity.
Genetic improvement of carp reduces poverty, hunger in Asia
Genetic improvement breeding programs for carp in a number of Asian countries have delivered genetically fast-growing strains to farmers and producers.
Nitrogen a limiting factor in aquaculture production
Improved feeds and feeding practices increase the proportion of nitrogen recovered in fish and shrimp and lessen the amount of ammonia excreted by the culture animals.
Airlifts combine pumping, water treatment in recirculation systems
Using the buoyancy of the entrained air bubbles to lift the water, airlifts are more energy-efficient and provide more aeration, carbon dioxide removal and foam fractionation for dissolved solids removal than centrifugal pump systems.