Can you tell me When do you use nets for Aquaculture?
Nets are used all of the time in aquaculture. Nets for Aquaculture are used in all aspects of capturing, testing, moving fish as well as nets for cages themselves.
Most Fish Farming operations will use non-capturing nets. The fishing fleet uses entanglement nets or gill nets which have been in the news for decades.But I am talking about the fish farms that grow in tanks, ponds Lakes or even in the ocean with a Net used as a cage. Smaller nets are used to capture test fish to ensure health and proper nutritional status.
Some of the nets used in Aquaculture are: fish traps, Seines, bucket nets, fyke nets, tunnel nets, dip nets and research nets. Nets are used to raise fish from Koi to Trout, and Tilapia to Salmon.Aquaculture netting solutions are used by fish hatcheries, fish farms, and research institutes across North America and the world.
Badinotti, a fish net manufacturer had this to say about their products and why they are providing nets for Aquaculture:
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In Fish farming, due to ever stricter environmental regulations and the desire for cost reduction, there is a distinct trend towards using bigger, offshore cages. Furthermore, provided living conditions can be kept good, more fish per cage will be farmed. The consequences of these trends are:
Production in rougher conditions;
Higher risk due to the increased value of fish
Fewer possibilities for inspection and maintenance;
In view of these trends, high reliability of the net cages is a prerequisite.
The reliability of the net cages, i.e. the capability to retain fish avoiding therefore the risk of escape, depends on the following factors:
1. Netting breaking strength;
2. Loss of strength due to wear and tear of net for use;
3. High quality of assembled products;
The above elements can be hugely affected by raw materials used for nets manufacture as well as the method adopted for construction. wide range of knotless netting in nylon, polyester, polypropylene, and polyethylene for aquaculture application.
information provide by www.badinotti.com/acquaculture%20fish%20farming%20nets.html
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There have been all sorts of nets for aquaculture during the years. Hand woven traps and nets were used in Australia. Some of the Native American nations would make nets and place them across a creek or river to catch fish. I have included some information from Wikipedia here,
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The indigenous Gunditjmara people in Victoria, Australia may have raised eels as early as 6000 BC. There is evidence that they developed about 100 square kilometers (39 sq mi) of volcanic floodplains in the vicinity of Lake Condah into a complex of channels and dams, that they used woven traps to capture eels, and that capturing and smoking eels supported them year round.
Aquaculture was operating in China circa 2500 BC.[9] When the waters subsided after river floods, some fishes, mainly carp, were trapped in lakes. Early aquaculturists fed their brood using nymphs and silkworm feces, and ate them. A fortunate genetic mutation of carp led to the emergence of goldfish during the Tang Dynasty.
Japanese cultivated seaweed by providing bamboo poles and, later, nets and oyster shells to serve as anchoring surfaces for spores.
Romans bred fish in ponds.
In central Europe, early Christian monasteries adopted Roman aquacultural practices.[11] Aquaculture spread in Europe during the Middle Ages, since away from the seacoasts and the big rivers, fish were scarce/expensive. Improvements in transportation during the 19th century made fish easily available and inexpensive, even in inland areas, making aquaculture less popular.
Hawaiians constructed oceanic fish ponds (see Hawaiian aquaculture). A remarkable example is a fish pond dating from at least 1,000 years ago, at Alekoko. Legend says that it was constructed by the mythical Menehune dwarf people.
In 1859 Stephen Ainsworth of West Bloomfield, New York, began experiments with brook trout. By 1864 Seth Green had established a commercial fish hatching operation at Caledonia Springs, near Rochester, New York.
By 1866, with the involvement of Dr. W. W. Fletcher of Concord, Massachusetts, artificial fish hatcheries were under way in both Canada and the United States. When the Dildo Island fish hatchery opened in Newfoundland in 1889, it was the largest and most advanced in the world.
source http://en.wikipedia.org/wiki/Aquaculture
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As you can see, there is a lot of variables to consider when deciding on nets for aquaculture.
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