Tuna aquaculture faces challenges in continued growth
One of the chief limitations for the tuna aquaculture industry is its primary dependence on diminishing wild fish to stock marine cages.
Assessing, reducing pond seepage
Ponds constructed on sandy or permeable soils are most likely to have high seepage rates. Ponds built in any soil can seep if improperlty constructed.
Speece cones saturate water with oxygen, ozone
Speece cones are capable of providing high concentrations of dissolved oxygen or ozone for water used in aquatic systems. High pressure within the cone systems diffuses the oxygen or ozone into the water as it flows downward through the inverted cone shape of the units.
Restoration program in Inland Bays improves ecosystems as oyster populations recover
Through the integration of aquaculture and the involvement of residents, the U.S. state of Delaware is working to restore its native oyster populations.
Greenhouse-enclosed superintensive shrimp production
As an alternative to pond production, U.S. scientists have developed bio-secure greenhouse-enclosed raceways for intensive shrimp production with limited water exchange.
Korean rockfish production
Hatcheries produce Korean rockfish seedlings in indoor tanks for sorting and grading. The fish grow well at relatively low water temperatures in net cages.
Plastic tanks compare well to concrete in trout trial
In a study comparing U-shaped plastic culture tanks to concrete raceways in a 31-week grow-out of trout fingerlings showed the plastic tanks offered lower costs, easy modification, transportability and reduced labor for cleaning.
Intensive system biofilter provides effective suspended solids treatment
Authors found the biofilter unit portion of the Intensive Bioproduction Korean system originally developed for nitrification can remove suspended solids.
HISTAR development
The Hydraulically Integrated Serial Turbidostat Algal Reactor (HISTAR) developed at Louisiana State University superimposes contaminant control techniques on a continuous algal production system.
Phytoplankton in aquaculture ponds
Aquaculture ponds typically have ideal conditions for the growth of various species of phytoplankton. Green algae are considered most desirable in freshwater ponds.
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.
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.
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.