Compensatory gains yield hidden profits
Compensatory gain is defined as faster than normal growth following a period of slower than normal growth, caused by nutritional and environmental factors.
‘Cash-SIS’ culture yields money crop, family food
In a study of pond polyculture, manipulation of species composition improved fish yield and corresponding income. Selling the whole production increased income 27 percent.
Evaporation affected by sunlight, temperature, wind
Evaporation of water from ponds is influenced by solar radiation, air and water temperature, and wind velocity. Control of aquatic plants can yield some reduction.
Sequencing batch reactors effectively treat shrimp aquaculture wastewater
One simple method of treating high-nitrogen wastewater in shrimp aquaculture is the use of sequencing batch reactors, which are simple in design.
Settling basin design, operation
To design a settling basin, know the size distribution of particles, estimated rate of inflow and determination of the smallest particle size to be removed.
Polychaete-assisted sand filters show potential in treating effluents
A practical way to treat mariculture effluents combines the physical attributes of a sand filter and the biological properties of hungry marine sand worms.
Integrated marine aquaculture-agriculture: Sea farming out of the sea
Aquaponic systems are robust, management is not difficult, and the synergies between fish and plants make vegetable production more profitable than aquaculture alone. The lion’s share of marine agriculture involves salt-tolerant halophytic plants used as food or feed, or in energy production.
Assessing groundwater quality in aquaculture
Those interested in using groundwater for aquaculture should perform a thorough chemical analysis of the water. Several problems related to groundwater use in hatcheries and holding or transport vessels can be alleviated by degassing or aeration.
The Shrimp Book: Shrimp pond soil and water quality management
Proper site selection, consideration of soil properties and careful earthwork construction at shrimp farms are essential. Prevention of erosion protects farm infrastructure and reduces sediment accumulation in ponds.
Avoid water chiller errors
Common factors that affect water chiller performance are inadequate water flow, inadequate heat recovery, inappropriate compressors and imbalances among compressor, condenser, evaporator and thermal expansion valves.
GIFT tilapia raise culture efficiency in Sri Lanka
The wide distribution and ongoing improvement of GIFT tilapia in Sri Lanka is raising living standards and employment for women in rural areas.
Prawn farming in Bangladesh faces climate change threats
The inadequate supply of postlarvae is a bottleneck for prawn production in Bangladesh. A shortage of wild broodstock to supply the hatcheries is an ongoing concern.
New policies, initiatives could advance U.S. aquaculture
U.S. policies are intended to facilitate sustainable marine aquaculture, restore natural resources and enhance fisheries. Additional initiatives address shellfish production, aquaculture management in the Gulf of Mexico and technology transfer.
Geotextile bags enhance effluent management in demo aquaculture system
One promising new technology for dewatering aquaculture solid waste is the use of geotextile bags: porous, sealed tubular containers constructed of high-strength, woven polyethylene material.
Sludge management at pangasius farm cuts discharges
In modifying its infrastructure and related pond management, QVD Aquaculture uses floating water plants to remove nitrogen and phosphorus from the discharge water. Sludge pens capture sludge at ponds for later reuse.
Seaweed farming offers avenue toward greater food security
Seaweed farming has both proven history and huge potential. Large-scale farms could produce raw materials for biofuel, aquatic feeds and human consumption.