Home Plan - [GR2-L7-U1-LC1-3 Salmon：A Link in the Food Chain]

The document provides comprehensive information on salmon, focusing on their role in food chains, their life cycle stages, and the practice of salmon fish farming. It stresses the interconnected nature of salmon with their environment and other living organisms, detailing how disruptions in their life cycle can impact the entire food chain. Additionally, it discusses the importance of clean water for salmon reproduction and the challenges they face due to pollution and disturbances in their habitats. The section on salmon fish farming traces its evolution as an industry, describing the process of raising salmon from eggs to market and highlighting the key stages involved in salmon aquaculture.

Contents

• Pages 1—23: Salmon food chain
• Pages 24—49: Salmon life cycle.
• Pages 50—51: Salmon fish farming.

This section of the document provides tips and guided reading information regarding salmon and their role in food chains. It includes words to know related to salmon, such as estuary, fertilize, food chain, and more. The document emphasizes the interconnected nature of salmon with other living things. It highlights the life stages of salmon from eggs to adults, emphasizing their importance in food chains. It also stresses the significance of understanding the life cycle of salmon and how they are interconnected with other animals and their environment. Additionally, there are activities for students to practice reading strategies such as summarizing and sequencing events. The document encourages students to think about how harming one living thing in a food chain can have adverse effects on other living things within the chain.

This section of the document discusses the life cycle of salmon, starting from the eggs laid in rivers or streambeds. It explains the importance of clean, cold water for the salmon to lay and fertilize eggs successfully. The document highlights how pollution, lack of oxygen in water, and disturbances in the food chain, such as plankton scarcity, can harm the salmon. The narrative progresses through the stages of alevins, fry, smolts, adults, and spawners, detailing their unique characteristics, behaviors, and challenges they face during their life cycle. It also touches on the significance of estuaries for smolts and the dangers they face during migration. The section concludes by emphasizing the interconnectedness of various species in the food chain and how disruptions in a salmon’s life cycle can affect other living organisms.

Salmon fish farming began as an experiment in the 1960s and developed into an industry in Norway in the 1980s and in Chile in the 1990s. The process of salmon farming involves raising the fish from egg to market. Initially, the salmon are nurtured in fresh water hatcheries for a year before being transferred to saltwater farm sites for further growth. They spend approximately 18 to 24 months in the saltwater farms before being ready for harvest. This section aims to introduce readers to salmon farming, providing an overview of the process involved in raising salmon for commercial purposes.