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Most fish have a homocercal tail, but it can be expressed in a variety of shapes. The tail fin can be rounded at the end, truncated (almost vertical edge, as in salmon), forked (ending in two prongs), emarginate (with a slight inward curve), or continuous (dorsal, caudal, and anal fins attached, as in eels).
The pinktail chalceus is a small, light-colored freshwater fish with a tail that is usually dark red to pink and is much more intensely colored than the rest of the animal. It has large, noticeable scales and reaches 24.5 cm SL, making it the largest known member of Chalceus. [2] The smallest is Chalceus epakros. [5]
It is most recognized by the large, flat keel-like structures running on either side of the tail. [3] They have 12 to 15 rays on their dorsal fins , and 17 to 20 rays on their anal fins . Keeltail needlefish have gill -rakers, their caudal peduncles have lateral keels, [ 4 ] with a lateral line running ventral to it, and grow up to 50 cm long ...
Fish tails are usually vertical and move from side to side. Cetacean flukes are horizontal and move up and down, because cetacean spines bend the same way as in other mammals. [92] [93] Similar adaptations for fully aquatic lifestyle are found both in dolphins and ichthyosaurs. Ichthyosaurs are ancient reptiles that resembled dolphins. They ...
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Aside from the electric eel (Electrophorus electricus), Gymnotiformes are slender fish with narrow bodies and tapering tails, hence the common name of "knifefishes".They have neither pelvic fins nor dorsal fins, but do possess greatly elongated anal fins that stretch along almost the entire underside of their bodies.
The scissortail sergeant or striptailed damselfish (Abudefduf sexfasciatus) is a large damselfish.It earns its name from the black-striped tail and sides, which are reminiscent of the insignia of a military Sergeant, being similar to those of the sergeant major damselfish.
This resulted in a strain of fish soon to be known throughout the world as Philadelphia veiltails. [ 1 ] [ 2 ] [ 5 ] Although some have suggested that Philadelphia Veiltails died out in America, [ 6 ] a man named Al Thomma was able to obtain stock from a John (Andy) W. Anderson of Philadelphia who possessed fish from the original Barrett line ...