Hypocercal Tail
Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as seen in sharks. Apart from the tail or caudal fin, fish fins have no direct connection with the spine and are supported only by muscles. Their principal function is to help the fish swim. Fins located in different places on the fish serve different purposes such as moving forward, turning, keeping an upright position or stopping. Most fish use fins when swimming, flying fish use pectoral fins for gliding, and frogfish use them for crawling. Fins can also be used for other purposes; male sharks and mosquitofish use a modified fin to deliver sperm, thresher sharks use their caudal fin to stun prey, reef stonefish have spines in their dorsal fins that inject venom, anglerfish use the first spine of their dorsal fin like a fishing rod to ...
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Lampanyctodes Hectoris (fins)
Hector's lanternfish (''Lampanyctodes hectoris'') is a lanternfish in the family Myctophidae, the only species in the genus ''Lampanyctodes''. It is named after James Hector. It is a widespread marine fish, known from shallow tropical waters in the south-eastern Atlantic, from the western Pacific off Australia and New Zealand, and from the eastern Pacific off Chile. It is one of the few species of lanternfishes to inhabit shallow waters, and in those waters it is one of the most abundant species of fish, and central to the food chain of the upper continental slope. The abundance is due to its high fecundity — it spawns multiple times in the winter so that the fry can take advantage of the spring bloom of krill. It grows up to standard length (SL) and may reach the age of 3 years. It reaches sexual maturity at approximately 50 mm SL and age of one year. Hector's lanternfish is fished commercially using seine nets in the waters off South Africa, where catches have reach ...
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