Which of the following is a true fish ?

[amp_mcq option1=”Jellyfish” option2=”Silverfish” option3=”Starfish” option4=”Sea horse” correct=”option4″]

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UPSC Geoscientist – 2024

The term “true fish” in a biological context refers to aquatic vertebrates belonging to the superclass Pisces. These animals are characterized by features such as gills for breathing oxygen from water, fins for locomotion, and typically scales. Many animals are commonly called “fish” but do not fit this biological definition.

– **Jellyfish:** These are marine invertebrates belonging to the phylum Cnidaria. They are not fish.
– **Silverfish:** These are small, wingless insects belonging to the order Zygentoma. They are not fish.
– **Starfish:** These are marine invertebrates belonging to the phylum Echinodermata. They are not fish.
– **Sea horse:** Sea horses are marine vertebrates belonging to the genus *Hippocampus*. They are a type of bony fish (class Actinopterygii).

Identifying “true fish” requires understanding basic zoological classification. The common names of many marine invertebrates include “fish” (e.g., shellfish, crayfish), leading to confusion. However, biologically, “fish” refers specifically to the aquatic vertebrates that breathe with gills and have fins.

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