Question

Large pectoral fins inserted dorsally and powerful tail occur in:
a) Remora
b) Anabas
c) Trygon
d) Exocoetus

Answer 1

Large pectoral fins inserted dorsally and powerful tails occur in Trygon. Trygon are stingray fishes that use pectoral fins for the purpose of protection from predators.

Complete answer:
Trygon can be described as the species of stingray fish, adapted to live as bottom dweller fish with the help of pectoral fins. Pectoral fins are responsible for their locomotion from one to another place. The tail of these stingray fish are responsible for providing them protection against predators and danger. There is a presence of poisonous sting at the tip of the tail that is used for protection from predators. In order to attack their predators these stingray fishes require a strong tail.

Additional information:
a) Remora are also termed as sharksucker or suckerfish. These fishes can be observed to attach themselves to large marine animals such as sharks or ships and ride on them. They are capable of adhering themselves by the means of a flat and over structured sucking disc on top of the head. The disk consists of a number of paired crosswise plates derived from the spiny portion of the dorsal fin.
b) Anabas is also known as climbing perch or walking fish which belongs to family Anabantidae and order Perciformes. Fish is recognised for its ability to both live and walk out of the water. It is known as an air-breathing labyrinth fish. It is found in ponds and ditches and may emerge in a short period of time walking.
d) Exocoetus fins provide them the capability of gliding in air. They are considered to be two winged tropical fish with only the pectoral fins enlarged. They belong to the family Exocoetidae and order Atheriniformesm.

Note:
Fishes swim mainly by lateral movements of tail and tail fin. Other fins are principally used as steering devices and rudders. When the body is at rest, the paired lateral fins serve to maintain equilibrium. Fins are also modified to serve other purposes. For example, the flying fish use their large and extended pectoral fins for gliding. Pelvic fins in some male
Chondrichthyes become modified as claspers. In some teleosts, the ventral anal
fin forms an intromittent organ or ovipositor.