Question

Large pectoral fins inserted dorsally and powerful tail occur in
A) Remora
B) Anabas
C) Trygon
D) Exocoetus

Answer 1

The two fins found on the sides of a fish (or marine mammal) are the pectoral fins. The regulation of lateral movement, up and down or side to side, is primarily responsible for these fins.

Complete answer:
Fins are typically a fish's most recognisable anatomical characteristics. They are made of bony spines or rays protruding from the body with skin covering them and joining them together, as seen in most bony fish, either in a webbed manner, or as seen in sharks, similar to a flipper. Fish fins have no clear relation with the spine, apart from the tail or caudal fin, and are protected only by muscles. Helping the fish swim is their key feature.

Fins found on the fish in various positions serve various functions, such as going forward, turning, holding an upright position or stopping. When swimming, most fish use fins, flying fish use pectoral fins to glide, and frogfish use them to crawl.On either foot, the paired pectoral fins are located, normally kept folded just behind the operculum, and are homologous to the tetrapod forelimbs.

The development of a dynamic lifting force that helps some fish, such as sharks, to retain depth and also allows "flight" for flying fish is a peculiar feature of pectoral fins, highly evolved in some fish.
In many fish, particularly the lobe-like fins of a certain anglerfish and the mudskipper, the pectoral fins help to walk.Finger-like projections, such as in sea robins and flying gurnards, can be adapted to some rays of the pectoral fins.The "horns" of manta rays and their relatives are referred to as cephalic fins; this is simply a variation of the anterior part of the pectoral fin.

The species of stingray fish is Trygon. As bottom dweller fish, pectoral fins are adapted to live life there. Pectoral fins aid with locomotion from one position to another.The role of the tail of the stingray fish is to defend against predators and threat. There is a poisonous sting at the tip of the tail, stingray uses this sting for the defence from predators. They attacked their predator there through the tail, so they needed a strong tail.

Thus the correct answer is option (C) Trygon.

Note: The other uses of fins include; male sharks and mosquitofish use a modified fin to carry sperm, thresher sharks use their caudal fin to stun prey, reef stonefish have spines that inject venom into their dorsal fins, anglerfish use the first spine of their dorsal fin as a fishing rod to attract prey, and triggerfish prevent predators by pressing through coral cracks and using spines in their fins.