Which one of the following belongs to ‘Pisces?

The term 'Pisces' refers to true fishes, which are aquatic vertebrates characterized by gills and fins. Dogfish is a common name for a small shark, which is a cartilaginous fish belonging to the class Chondrichthyes within the superclass Pisces. Sharks possess specialized sensory organs like the ampullae of Lorenzini to detect electric fields [1]. In contrast, the other options are 'false fishes' belonging to different phyla. Jellyfish are members of the phylum Cnidaria and are soft-bodied organisms related to sea anemones [4]. Starfish (or sea stars) are marine animals belonging to the phylum Echinodermata, characterized by radial symmetry and spines [3]. Silverfish is not an aquatic animal at all; it is a wingless insect belonging to the order Zygentoma [1]. Therefore, only the dogfish is a true member of Pisces.

Sources

1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 14: Marine Organisms > tro11ou ltn.ty*?. > p. 208
2. [4] Exploring Society:India and Beyond. Social Science-Class VI . NCERT(Revised ed 2025) > Chapter 2: Oceans and Continents > Ocean Life > p. 30
3. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 17: Major Landforms and Cycle of Erosion > Coral Reefs > p. 219
4. [3] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 9: Indian Biodiversity Diverse Landscape > Echinoderms > p. 155