- •1 Aquaculture
- •Vocabulary
- •2 Aquaculture’s beginnings
- •Vocabulary
- •3 Ancient and modern aquaculture
- •Vocabulary
- •Vocabulary
- •5 Criteria for commercially successful aquaculture
- •Vocabulary
- •6 Control over reared species Part 1
- •Vocabulary
- •Vocabulary
- •7 Feeding the world through agriculture
- •Vocabulary
- •8 The big two in fish culture Part 1
- •Vocabulary
- •Vocabulary
- •9 Aquaculture species in the united states Part 1
- •Vocabulary
- •Vocabulary
- •10 Culture systems
- •Vocabulary
- •11 Types of aquaculture opeations
- •Vocabulary
- •12 Management of culture system Part 1
- •Vocabulary
- •Vocabulary
- •13 Nutrition and feeding Part 1
- •Vocabulary
- •Vocabulary
- •Genetics and reproduction Part 1
- •Vocabulary
- •Vocabulary
- •15 Diseases and parasites
- •Vocabulary
- •Potential adverse effects
- •Vocabulary
Vocabulary
susceptible |
восприимчивый, чувствительный |
protozoan |
простейшее животное |
helminth |
гельминт (паразитический червь) |
copepods |
веслоногие ракообразные |
outbreak |
вспышка |
epizootic |
эпизоотия |
to stress |
подвергать стрессу |
to deteriorate |
ухудшаться |
to undergo |
переносить, подвергаться |
handling |
обращение, зд. уход, подход |
sustained |
длительный, непрерывный |
onset |
наступление |
infestation |
инвазия (заражение паразитами) |
ultimately |
в конце концов |
to ingest |
глотать, проглатывать |
to avoid |
избегать |
imminent |
надвигающийся, неминуемый |
overall |
в целом, в общем |
Answer the questions
1.When do we use the terms “epidemic” and when “epizootic”?
2. What are the reasons for stresses and diseases?
3. How can the diseases be treated?
4. What are the preventive measures to avoid diseases and parasite problems?
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Potential adverse effects
Not too long ago, aquaculture was perceived as a cure for hunger and dwindling wild fish supplies. At the end of the twentieth century, given the rapid growth of the aquaculture industry, critics began questioning the real social and environmental impacts of aquaculture. The social impacts are generally felt more acutely in poorer countries. For example, people have been displaced from their homes and jobs by aquaculture operations, sometimes by operations that pollute land and water previously used by local residents.
Aquaculture, like any farming activity, produces effects on the environment. Aquaculture uses energy and creates wastes. As aquaculture replaces wild habitat , changes to the ecosystem inevitably occur. Even where aquaculture operations are placed in non-pristine areas, potential exists for exotic (nonnative and genetically altered) aquaculture species to escape and adversely affect native species by competing for food and space, interbreeding and hybridizing native species, and spreading disease. Collecting wild larvae for rearing in aquaculture units can decimate native populations of fish, and can affect biodiversity. Toxic and bioaccumulative compounds can be harmful to people, including fish farmers themselves, and to plants and animals. Excessive discharge of organic wastes causes pollution.
The environmental impacts of effluents depend on the type of aquaculture practiced, and on farm management. Aquaculture can, in local situations, improve the environment or be environmentally benign. If ponds are properly managed, nutrient-rich discharges (soil and water) can be dredged for use in crop production, thereby reducing the need for soil amendments such as inorganic fertilizers.
Fish ponds can increase bird populations, which are pleasing to birdwatchers, but are disdained by fish farmers. While poorly managed fish ponds can serve as breeding grounds for vectors of animal and human disease, well-managed fish ponds can be used to control these vectors. Thus, fish farm management geared at minimizing negative environmental effects can be critical for balancing the farm's impact on the environment, and for its own long-term success.