Thin, rounded, smooth-edged and disk like scale is called Cycloid Scale. Found in most of all carps and similar fishes with soft fin rays. Arranged in an overlapping pattern. Consist of a rigid surface layer primarily composed of calcium-based salts
Broodfish
Mature fish which is used for the production of eggs or sperm for breeding purposes in fish hatcheries. Eggs or sperm producing mature fish in natural water-body like river is also known as broodfish. Female brood-fish are also called as
Acrania
Acrania or Acraniata is a group of chordates which have no skull or cranium, head, brain, vertebral column and jaws but have notochord. All are marine, small in size and treated as lower or primitive chordates. This group is divided