Young Alaskan salmon's diet includes insects, plankton, and invertebrates.
Adult Alaskan salmon's diet includes squid, eels, other species of fish, and shrimps.
The salmon can be considered a predator, it obtains energy and matter to sustain itself from its prey, which includes smaller organisms.
The food is broken down into organic and inorganic compounds during the process of digestion, and the smaller molecules obtained are then absorbed by the intestinal membrane and used by the different systems of the organism for their metabolic purposes.
The statement that explains this is the third one
Salmon break bonds in complex food molecules to release the carbon, oxygen, and hydrogen atoms needed for the formation of other molecules.