The diagrams below show the life cycle of a salmon fish from an egg to an adult fish and its population from 1970 to 1999 in North America. Summarize the information by selecting and reporting the main features and make comparisons where relevant.
20 minutes, 150 words at least.
The given diagram presents the life cycle of a salmon fish from birth through an egg to an adult which spawns new eggs before dying. The bar chart provides data about the number of Salmon fish in North America during five-year periods. (Introduction)
The adult Salmon fish, both male and female, spawn and fertilize the eggs before dying. These eggs soon hatch to give birth to a baby, often termed as Alevin. Alevin then develops into a fry, which later becomes Parr. A Parr transforms into a Smolt before becoming an adult. The adult Salmon then spawns to lay eggs before dying. (Diagram 1 explained)
The population of Salmon has dwindled drastically during the past few decades. North America had more than 35000 Salmon fish during the five years from 1970 to 1974. The number fell drastically till 1990 to 1994 when its population was just 500. Thereafter, it rose marginally to about 1500 in 1995 to 1999. Overall, the fish’s population is only a fraction of what it was in 1970 to 1974. (Bar chart explained)
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