2015-02-14
658
1. Why are the following aquatic species less popular in the United States?
UNIT 3
CULTURE SYSTEMS
Active vocabulary
| compacted | плотный, массивный, сжатый |
| slope | уклон |
| ration | соотношение, пропорция |
| shallow | плоский |
| management | управление, умение справиться с чем-либо |
| to exceed | превышать |
| drain | дренаж, осушать |
| inflow | втекающий, впадающий |
| to be in stock | иметь в наличии |
| linear | узкий и длинный, подобный линии |
| raceway | лоток, рыбоходный канал |
| to expose | подвергать, зд. Оставлять |
| cage | садок, изолятор |
| net-pen | садок, огороженное место сетями для выращивания объектов марикультуры |
| hatchery | инкубаторная станция |
CULTURE SYSTEMS
Read the following international words and translate them.
Culture, system, typical, ration, erosion, yards, acre, static, minimum, industry, production, period, minutes, structures, natural, meters, practiced, limited, farmers, operations, commercially, storms.
Give Russian equivalents of the following words and word combinations.
Side slopes, steeper slopes, to remove water completely, to maintain higher densities, a leaner channel, a circular tank, to have a drain, freshwater environment, marine environment, to withstand storms.
Read and translate the text with the help of a dictionary.
Ponds.
The primary culture system used in the world today is the earthen pond. A typical pond is about 3 feet (1 m) deep at the upper end and 6 feet (2 m) deep at the drain. The bottom and sides are made from compacted earth sides slope at a ration of 2:1 or 3:1. Steeper slopes make entry and exit from the pond difficult and promote erosion of the banks, while shallower slopes promote the establishment of aquatic weeds. Pond size varies greatly – some are only a few square 
yards in area, but most are an acre (0,4 ha) or larger. Management and harvesting become difficult if a pond too large, so most culture ponds do not exceed about 20 acres (8 ha).
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A well designed pond should have a drain that allows the water to be completely removed within a day or two and should be provided with an inflow pipe of sufficient size that the pond can be filled within a reasonable period of time. Ponds can be stocked at various densities. If water is exchanged continuously or frequently, higher densities of culture animals can be maintained than when static conditions are employed. Catfish farmers in Mississippi are annually producing over 4,000 ponds per acre in ponds
