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They are elongate, silvery, predatory marine fishes that lack scales and have sharp teeth likely used for hunting fishes. However, as their scientific name (meaning "without fins on its back") suggests, they lack dorsal fins which easily differentiates them from their close allies, especially the similar-looking lancetfishes.
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]
The Chaetognatha / k iː ˈ t ɒ ɡ n ə θ ə / or chaetognaths / ˈ k iː t ɒ ɡ n æ θ s / (meaning bristle-jaws) are a phylum of predatory marine worms that are a major component of plankton worldwide. Commonly known as arrow worms, they are mostly nektonic; however about 20% of the known species are benthic, and can attach to algae and ...
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.
It has relatively small pectoral fins, and the pelvic fins are directly below the forwardmost point of the first dorsal fin; The anal fin has a one spiny ray and 9 soft rays. [3] S. sphyraena has scales covering both the anterior and posterior margins of the preoperculum , whereas in Sphyraena viridensis both margins have no scales. [ 5 ]
The tiger muskie has some of the characteristics of both fish. Tiger muskie, like pike and muskellunge, have long, cylindrical-shaped bodies. Their dorsal and ventral fins are located far back near the tail and are lobe-shaped. [8] The caudal fins of the tail are more rounded than those of true muskies.
Image credits: anon #2. We have the world's stupidest dachshund. One time he sneezed next to a kitchen cabinet and hit his head on the door. He barked at the cabinet for hitting him.
The Pacific viperfish (Chauliodus macouni), is a predatory deep-sea fish found in the North Pacific. [1] [2] It is reported as being either mesopelagic [1] or bathypelagic, with diel vertical migration to shallower waters. [2] The Pacific viperfish is one of the nine different species that belong to the genus Chauliodus, the viperfish.