Net impacts: An argument for open-ocean aquaculture
In a comparison of tank culture and net pen farming of almaco jack, the offshore operations were about twice as efficient per kilogram of product in terms of energy use and carbon inputs.
Marine, brackishwater finfish culture in Indonesia
Despite the impacts of the December 2004 tsunami, aquaculture in Aceh, Indonesia, is recovering with support from Indonesian and international agencies.
Dissolved oxygen management in aquaculture
Management of dissolved oxygen in ponds with static water is difficult, so managers of non-aerated ponds usually limit stocking and feeding rates.
Sulfides alter aquaculture pond pH, can be toxic
Ponds constructed where soils contain sulfides can have problems with low pH in culture water. Liming can be an effective emergency measure.
Molluscan seed production, hatchery development in China
Molluscan seed production in China encompasses 32 species. The seeds of most clams are collected from natural sources in farming areas.
Salinity balance key to culture success
Outside optimal salinity ranges, aquaculture species have higher feed-conversion ratios, grow at slower rates, become stressed and susceptible to disease, or even die.
Responsible chemical use in aquaculture
Pesticides, herbicides and fungicides may control pests and noxious vegetation, but environmental and health concerns call for responsible chemical use.
Industrial aquaculture parks an intensive alternative for land-based seafood production
Industrial aquaculture parks that employ hyperintensive culture technology are a promising alternative for further land-based seafood production. They offer wide siting options, efficient land and water resource use, and high-density, high-yield production output. In Project Raceways, a five-nation consortium is developing protocols for the culture of several highly valuable species of marine fish in raceway systems.
Collective marketing may help small-scale fish farmers grow in Africa
In research on collective marketing involving 32 small-scale fish farmers in Cameroon, 12 made a profit, which sparked further local interest in the concept.
Phosphorus: Key to phytoplankton management
Phosphorus from uneaten feed and feces of culture animals can cause excessive phytoplankton growth and associated degradation of water quality.
Floating raceways provide option for marine fish fingerling production
Floating raceways can be put in ponds, reservoirs, or sheltered waters as small-scale production systems for fingerlings or short-term nursery environments.
Nitrification an important process in aquaculture
In the water of aquaculture systems, certain bacteria transform potentially toxic ammonia to nontoxic nitrate through nitrification.
Brazil’s inland aquaculture
Freshwater fish culture is practiced in every state in Brazil, primarily at small-scale earthen pond facilities, but tilapia culture in reservoir cages is increasing.
Growing pangus industry faces constraints in Bangladesh
As reflected in a survey by the authors, rising productivity and higher yields have made pangus culture more profitable than carp farming.
Freshwater farming in Papua New Guinea
To further development of freshwater fish farming in Papua New Guinea, farmers need improved supplies of fingerlings and appropriate training and extension services.
Total alkalinity and total hardness
Alkalinity is an index of the capacity of water to neutralize acidity. Hardness represents the sum of calcium and magnesium concentrations. Both values vary greatly in freshwater sources.