double arrow

Read and translate the text with the help of a dictionary. The twentieth century witnessed the science of fish culture unveiling many new methods for growing aquatic animals and plants

The twentieth century witnessed the science of fish culture unveiling many new methods for growing aquatic animals and plants.

Although hatcheries serve a wide range of purposes, many cultivate fish species are grown to supplement recreational fishing. This freshwater hatchery in Indiana supports the state’s stocking strategy, and annually cultivates about 30 million walleye eggs. Eggs change in color from bright yellow to black as the fry develop and hatch inside incubating cylinders.

Reproduction of desired species, feed formulation, and water quality management have helped to generate the rapid growth of aquaculture. The biological selection of culture species depends on many factors. A few criteria that must be considered in choosing a species to cultivate include the following characteristics of a species:

  • Growth rate;
  • Place in the food chain;
  • Climate and environmental adaptations;
  • Disease resistance;
  • Breeding characteristics;
  • Compatibility with other fish species in cultivation; and
  • Conversion efficiency (feed-to-flesh).

For example, aquaculturists prefer fast-growing planktivores because of their short food chain.

Interestingly, biotechnological selection criteria are not always the most critical; for example, growing fish unsuitable for local or export markets can readily drive a farmer out of business. Thus, consumer preference, market conditions, regulations against nonnative species, and other economic, social, and political criteria play an important role in species selection.

4.5 Give English equivalents:

Водные животные и растения, ярко-желтый, качество воды, быстрый рост, норма роста, пищевая цепь, устойчивость к болезням, неместные виды.

4.6 Translate the given Russian words into the English ones:

1. Many cultivated fish species are grown specially for (развлекательное рыбоводство).

2. (Икра) change in color from bright (желтый) to black.

3. The biological selection of (выращиваемые виды) depends on many factors.

4. (Планктоноядные) have short food chain.

5. Economic, social and political criteria play an important role in (выбор видов).


Понравилась статья? Добавь ее в закладку (CTRL+D) и не забудь поделиться с друзьями:  



Сейчас читают про: