Scombriformes

Scombroidei or Scombrales is a suborder or infraorder of the order Scombriformes or suborder Scombroidei. The suborder or infraorder includes the tunas, mackerel and snake-mackerels. Regular scombrids are observed to have large heads, eyes, and mouths. In most cases, the second dorsal fin will develop before the development of the first.

species of fish

Scombriformes, also known as Pelagia or Pelagiaria, is an order of ray-finned fish within the clade Percomorpha. It contains 287 extant species in 16 families, most of which were previously classified under the suborders Scombroidei and Stromateoidei of the order Perciformes.

The ragfish (Icosteus aenigmaticus) is a ray-finned fish of the northern Pacific Ocean; although classified as a bony fish, its skeleton is mostly cartilage, and the larvae have pelvic fins that disappear as they mature. It is the sole member of the family Icosteidae within the order Scombriformes.

Stromateoidei or Stromateales is a suborder or infraorder of marine ray-finned fish within the order Scombriformes or suborder Scombroidei. It includes the medusafishes, squaretails and driftfishes which associate with jellyfish, the latter families preying on them while the medusafish use them for protection while scavenging food scraps. It also contains the true butterfish, a common food fish.

Amarsipus is the sole genus in the bagless glassfish family, Amarsipidae. It contains the single species Amarsipus carlsbergi, the amarsipa, which is a small and slender fish that lives in equatorial parts of the Indian and Pacific Oceans. It is found at depths from . It reaches in standard length. Molecular phylogenetic analysis has placed this family in the order Scombriformes within Pelagiaria; however, relationships between many pelagiarian lineages are poorly resolved and the nearest relatives of Amarsipidae remain unclear.