Band 7+: 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.

The diagram illustrates the cycle of a fish’s life

Overall, there are various stages in the life of a common fish, from eggs being hatched, through alevin, frying, parring, smolting to being adults. Subsequently, those adult fishes spawn eggs, and this process repeats all over again.

At the beginning of the process, adult fishes spawn eggs in fresh water, which hatch in about 3 months to become alevins, and then they feed off yolk-sac for some weeks later, waiting for the upcoming steps.

The process continues with alevins developing into fries, which are about 5 to 10 weeks old. It is noticeable that they have become typical fishes and begin to swim. Then, after several months olds, fries change into parrs, which have finger markings across their bodies, after which, at 1 to 3 years old, they grow into smolts, having will groups and looking forward to sea.

Finally, they develop into adults, which are significantly bigger than their older forms, and spend 1 to 8 years at sea. Next, as their heads display different appearances, they begin to reproduce eggs, and they will die within 2 weeks.