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A number of countries have created their own national standards and certifying bodies for organic aquaculture. While there is not simply one international organic aquaculture standardization process, one of the largest certification organizations is the Global Trust, [9] which delivers assessments and certifications to match the highest quality organic aquaculture standards.
A maize crop yielding 6–9 tonnes of grain per hectare (2.5 acres) requires 31–50 kilograms (68–110 lb) of phosphate fertilizer to be applied; soybean crops require about half, 20–25 kg per hectare. [21] Yara International is the world's largest producer of nitrogen-based fertilizers. [22]
Any ecosystem impacts of using seaweed for plant and crop fertilizer are primarily due to how the seaweed is harvested. [36] Large-scale, unsustainable seaweed farming can lead to the displacement and alteration of native habitats due to the presence of farming infrastructure in the water, and day-to-day anthropogenic operations in the area. [36]
Large aquaculture facilities (i.e. those producing 20,000 pounds (9,100 kg) per year) which discharge wastewater are required to obtain permits pursuant to the Clean Water Act. [167] Facilities that produce at least 100,000 pounds (45,000 kg) of fish, molluscs or crustaceans a year are subject to specific national discharge standards. [168]
Urea is the most used fertilizer in the world, due to its high content of nitrogen, low cost and high reactivity towards water. [32] When exposed to ocean waters, urea is metabolized by phytoplankton via urease enzymes to produce ammonia. [33] + +
The main species of fish farmed in Canada is led by salmon with 70.5% of all fish in aquaculture followed by mussels with 15.1%. Aquaculture makes a significant contribution to Canada's economy totaling $2.1 billion in revenue and jobs in Canada in 2009.
Typical build ratios are .5 to 1 square foot of grow space for every 1 U.S. gal (3.8 L) of aquaculture water in the system. 1 U.S. gal (3.8 L) of water can support between .5 lb (0.23 kg) and 1 lb (0.45 kg) of fish stock depending on aeration and filtration.
A sustainable fish farming facility in Sarasota, Florida called Mote Aquaculture Park launched a commercial demonstration project in fall 2014 with the purpose of demonstrating marine aquaponics farming practices. The project raises the saltwater fish species red drum alongside salt-loving halophyte plants, sea purslane and saltwort.. The ...