雅思三文鱼产卵作文

The Life Cycle of Salmon and Egg-Laying

The salmon's life cycle is a remarkable journey that spans from the egg stage to maturity, with a significant phase dedicated to reproduction. The diagram below illustrates this journey, highlighting the key stages and locations where salmon spend their time。

Egg Laying and Incubation:

Salmon begin their lives in rivers, where adult fish lay and incubate their eggs among riverbed pebbles.

Emergence and Rearing:

After hatching, young salmon are reared in freshwater areas, such as lakes, for about a year before they migrate to the sea.

Migration to the Sea:

At some point during their development, salmon move from freshwater to the ocean, where they face numerous dangers and predators.

Maturation and Return:

After maturing in the ocean, salmon are driven by an innate instinct to return to their birthplace to spawn.

They gather at river estuaries in October and swim upstream, despite the challenges of rapids and energy-depleting逆流而上 journey.