Question

Example of viviparous fish is
A.Labeo
B.Scoliodon
C.Hippocampus
D.Exocoetus

Answer 1

Hint: In the Carcharhinidae family, it is a genus of Requiem sharks. It is an elongated cartilaginous fish in the form of a spindle. It has a compressed lateral body.

Complete answer:
First we should know about viviparity to answer this question. Viviparity is the embryo's growth within the parent's body, ultimately leading to a live birth. This is opposed to oviparity, a reproductive mode in which females lay eggs that complete their growth and hatch from the mother externally to develop.
Now, let us find the solution from the options-
Labeo is the Cyprinidae Carp Family. On the underside of the head, Labeos have a thick-lipped, sucking mouth and two or four tiny mouth barbels. They feed on algae and small animals and are bottom feeders. They are oviparous. Thus, the option A is incorrect.
 Scoliodon is the Requiem Shark genus. The most sophisticated mode in viviparity of any species is demonstrated by the Scoliodon or spadenose shark.
Hippocampus is an Indo-Pacific native to the Syngnathidae family of seahorses. They are oviparous. Thus, the option C is incorrect.
Exocoetus is a flying fish genus. It is known as a bony fish. Cycloid scales surround the body. The mouth is wide and the jaws are teeth-bearing. They are oviparous. Thus, the option D is incorrect.

Hence, the correct answer is option (B)

Note: Viviparity is an incredibly complex condition in fish, since it includes various changes in both male and female reproductive systems. Many species of viviparous freshwater fish are now endangered. The major factors are of anthropogenic origin and include habitat loss, pollution, and the introduction of invasive species.