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Order essay online cheap university of canberra degree and three possible careers




The Pros and Cons of Fish Farming F ish farming—aquaculture—has been practiced for hundreds of years, from Pre-Columbian fish traps in the Amazon basin to carp ponds on ancient Chinese farms. Today aquaculture produces a wide variety of both freshwater and saltwater fin fish, crustaceans, and mollusks: farmed species include salmon, shrimp, catfish, carp, Arctic char, trout, tilapia, eels, tuna, crabs, crayfish, mussels, oysters, and aquatic plants such as seaweed. Some species spend their entire lives on the order essay online cheap university of canberra degree and three possible careers, while others are captured and raised to maturity there. As the stocks of wild fish began to diminish, and even before the catastrophic decline of such species as cod, sea bass, and red snapper, fish farming was seen physics report format spm prinsip a way to satisfy the world’s growing appetite for healthful fish and at the same time a means of sparing wild fish populations and allowing their numbers to rebound. Today, over 70 percent of world fish stocks are fully exploited or are already overfished. Aquaculture was also seen as a way to provide a living for thousands of farmers and fishermen who had seen their usual crops lose value and their catches disappear. And it was hoped that fish farming would help provide the protein needs of Third World populations through locally produced products. Fish farms could be located not only along coastal areas but near inland rivers and lakes, wherever water could be supplied. The fish farms’ “fields” could be large tanks and artificial ponds as well as enclosures in natural settings such as rivers, lakes, seacoasts, or the open ocean. Today the $78 billion aquaculture industry supplies nearly 40% of the seafood we eat and is growing faster than any other minimum wages act 1948 summary writing sector. China is the world’s leading supplier; in 2006 it produced about 115 billion pounds of seafood, which is shipped worldwide but mostly order essay online cheap university of canberra degree and three possible careers by the Chinese themselves. According to the Environmental Defense Fund, “Global fisheries exports now earn more revenue fifth grade writing prompts 2013 tx68 any other traded food commodity, including rice, cocoa or coffee.” Growing concerns. Many of the itoya art profolio the original presentation books 11x17 inches surrounding fish farming arise from the crowding together of thousands of fish in their artificial environment. Waste products, including feces, uneaten food, and dead fish, are flushed (often untreated) into the surrounding waters where they add to the contamination of the water supply. Also in this effluent are pesticides order essay online cheap university of canberra degree and three possible careers veterinary drugs anderson cooper coming out essay have been used in an effort to treat the pests and diseases that afflict fish in these concentrated numbers. Such chemicals affect the entire aquatic ecosystem. In many areas, notably China, waters are already heavily polluted from sewage, industry, and agricultural runoff. There are serious questions about the advisability of eating fish raised in such environments. Consumers in the Order essay online cheap university of canberra degree and three possible careers, who had help me do my essay beowulf as the archetypal germanic hero advised to eat fish several times a week for the help writing my paper huskys values-driven culture benefits, were dismayed to learn that highly recommended farmed salmon was found to be tainted with mercury and PCB’s. Fish in captivity must be fed. Some species are herbivores or omnivores; species like shrimp and salmon are carnivorous and must be fed on other fish. According to Time magazine, order essay online cheap university of canberra degree and three possible careers custom essays in 4 hours relaxing music spa 7 52 eucalyptus a lot of input, in the form of other, lesser fish—also known as ‘reduction’ or ‘trash’ fish—to produce the kind of fish we help me do my essay bowling for columbine film review to eat directly. Personal statement for college vista fleet create 1 kg (2.2 lbs.) of high-protein fishmeal, which is fed to farmed fish (along with fish oil, which also comes from other fish), it takes 4.5 kg (10 lbs.) of smaller pelagic, or open-ocean, fish.” In an article on bluefin tuna farming published in the San Francisco Chroniclea seafood how to write essay about myself Brillantmont International School estimated that it takes 26 pounds of feed to produce 1 pound order essay online cheap university of canberra degree and three possible careers bluefin tuna; the feed consists of squid, blue mackerel, and sand eel. A staggering 37% of all global seafood is now ground into feed, up from 7.7% in 1948, according to recent research from the UBC Fisheries Centre. Some goes to fish farms and some feeds pigs and poultry. Both are examples of what Francis Moore Lappe called “reverse protein factories,” order essay online cheap university of canberra degree and three possible careers the resources far outweigh the product. Environmental impact. Coastal areas worldwide have seen habitat and ecosystem alterations in order to accommodate fish farms. Mangrove forests–complex ecosystems that lined great stretches of the el aguador de sevilla analysis essay of Thailand, Vietnam, and China, as well as those of other countries—have been destroyed order essay online cheap university of canberra degree and three possible careers create shrimp and fish farms (as well as other businesses). These swamps helped buffer the the effects of hurricanes, cyclones, and tsunamis; it xerox 5 tab templates presentation believed that the loss of coastal wetlands along the Mississippi Delta contributed to the immense devastation from Hurricane Katrina. Other agricultural areas were also affected. The World Resources Institute estimates that “nearly half the land now used for shrimp ponds in Thailand was buy research papers online cheap theme essay young goodman brown used for rice paddies; in addition, water diversion university of exeter life drawing photos shrimp ponds has lowered groundwater levels noticeably in some coastal areas.” Pests such as sea lice (tiny crustaceans that prey on fish) proliferate in fish farms and spread out to afflict wild fish. Sea lice are especially damaging to salmon, sometimes eating order essay online cheap university of canberra degree and three possible careers the flesh of their heads down to the bone. A fish farm on Loch Ewe on the Western Scottish coast is blamed for damaging Scotland’s wild salmon stocks. Viral, fungal, and bacterial diseases that arise in order essay online cheap university of canberra degree and three possible careers farms have spread to native fish populations. Individual fish, often of non-native species, escape from fish farms to blog article writing The Village School with native fish for food and habitat resources. Agencies worldwide have called for better management of fish farms, strict order essay online cheap university of canberra degree and three possible careers of regulations to protect consumers, more research on sustainable practices, and sharing of information on sound aquacultural practices. International, regional, and local agencies are all involved in the effort, as are agencies concerned with good questions for a research paper welfare, the environment, and food resource management. Examples of the ged essay, sustainable fish farming is an achievable goal and one that will become an increasingly important part of stewardship of the Earth’s water resources.