Which of the following belongs to chordates?

Explanation

Trout fish belong to the phylum Chordata, which is characterized by animals that possess a notochord at some stage of development, a dorsal nerve cord, pharyngeal slits, and a post-anal tail. Trout specifically belong to the class Actinopterygii (ray-finned fishes) and the order Salmoniformes. They are typically found in freshwater habitats like rivers and lakes and are known for their streamlined bodies and gills for respiration. Trout are popular among anglers and play a significant role in freshwater ecosystems as both predators and prey.