Active Reading Section 3: Animals and Agriculture Read the passage below and answer the questions that follow. There are a number of different methods of aquaculture. The most common method is known as a fish farm Fish farms generally consist of many individual ponds that each contain fish at a specific stage of development Clean water is circulated through the ponds and brings in oxygen while sweeping away carbon dioxide and fecal wastes The fish grow to maturity in the ponds and are then harvested. Another type of aquaculture operation is known as a ranch. In this method, fish such as salmon are raised until they reach a certain age and are then released. The salmon, for example, migrate downstream to the ocean, where they live until adulthood. When they are mature the fish return to their birthplace to reproduce. When they return they are captured and harvested. IDENTIFYING MAIN IDEAS One reading skill is the ability to identify the main idea of a passage. The main idea is the main focus or key idea.Frequently, a main idea is accompanied by supporting information that offers detailed facts about main ideas. Write the letter of the term or phrase in the space provided,that best completes each statement or best answers each question. __ 1. What is the most common method of aquaculture? a. fish farming c. capturing b. ranching d. migrating __ 2. Each individual pond on a fish farm contains a. several different types of fish. b. one fish species and one of its predators. c. fish at a specific stage of development. d. mature fish that are ready to be harvested. __ 3. Where do salmon live until they reach a certain age, before adulthood? a. on a fish farm c. in a river b. on a ranch d. in the ocean __ 4. Where do salmon live after they leave their birthplace and until they reach adulthood? a. in the ocean c. downstream b. in a pond d. on a ranch