Question

The age of fishes was
A. Silurian
B. Ordovician
C. Devonian
D. Permian

Answer 1

Hint: In this period the variety of the fishes increases drastically, it was the period where the tetrapods were the base evolution species among the fishes, the evolution of jawed vertebrates is the major highlight of this age.

Complete answer:
Evolution of fishes started before 530 million years ago
Jawed vertebrates were developed in the Ordovician period
Silurian is the shortest period of age, it was the third period of the palaeozoic era
Silurian was known to have evidence fossils of underwater and freshwater ecosystems
Permian is known for the extreme largest mass extinct and extreme climates, reptiles were the king in this period
In the Devonian period, armoured placoderms were the remarkable bloom species
They have powerful jawline with a blade-like plate, were huge
The Devonian period is known for having the shark ancestors: cartilage fishes
Cartilage fishes skeletons were known to give rise to sharks and rays
It is also known for the bony fishes which are named as modern fishes as they are scaly, have gas-filled swim bladders and have their structure build in such a way it can maintain the buoyancy
Bony fishes include lobe fins that also include the dinosaurs and mammals other than fishes new varieties evolving in the period.

The correct answer is an option ( C ) that is Devonian.

Note:
fishes evolution comes in a palaeozoic era where Permian has the largest mass extinct, then comes Devonian – include first (vertebrates, seed plant, insects, fishes) after this period comes Silurian(first jawed fish), Ordovician(first land plant) and at last Cambrian(explosion of animals).