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Actinopterygii (/ ˌ æ k t ɪ n ɒ p t ə ˈ r ɪ dʒ i aɪ /; from Ancient Greek ἀκτίς (aktis) 'having rays' and πτέρυξ (ptérux) 'wing, fins'), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish [2] that comprise over 50% of living vertebrate species. [3]
While surveying the cave, researchers said they found 11 fish with transparent fins living inside. The fish turned out to be a new species: Balitora anlongensis, or the Anlong stone loach.
Lancetfish possess a long and very high dorsal fin, soft-rayed from end to end, with an adipose fin behind it. The dorsal fin has 41 to 44 rays and occupies the greater length of the back. This fin is rounded in outline, about twice as high as the fish is deep, and can be depressed into a groove along the back.
The shape, size, position and colour of the dorsal fin varies with the type of billfish, and can be a simple way to identify a billfish species. For example, the white marlin has a dorsal fin with a curved front edge and is covered with black spots. The huge dorsal fin, or sail of the sailfish is kept retracted most of the time.
The new species doesn’t have lateral lacrimal or second preopercular spines, meaning a spine on the head and the front of the gills. The fish also has much longer lower pectoral-fin rays, the ...
It is one of 26 endemic species of triplefin found in New Zealand across 14 genera. [2] This species is very common in the temperate coastal and intertidal waters of New Zealand where it often lives in cobble habitats, [3] [4] [5] but has been found as deep as 30 m. [6] It has a maximum body length of around 70 mm and lives for up to three ...
The American pickerel (Esox americanus) is a medium-sized species of North American freshwater predatory fish belonging to the pike family. [2] The genus Esox is placed in family Esocidae in order Esociformes). Two subspecies are sometimes recognised: Redfin pickerel, sometimes called the brook pickerel, E. americanus americanus Gmelin, 1789;
The small, slender pelvic fins are located underneath the throat and possess a single spine; the large anal fin may have one or two spines. The pectoral fins are greatly enlarged, and the tail fin is rounded. The New Zealand topknot, Notoclinus fenestratus, is the largest species at 20 cm in total length; most other species do not exceed 6 cm.