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Leptocephalus larva. A leptocephalus (meaning "slim head" [1]) is the flat and transparent larva of the eel, marine eels, and other members of the superorder Elopomorpha.This is one of the most diverse groups of teleosts, containing 801 species in 4 orders, 24 families, and 156 genera.
The mature eels then die, their eggs floating to the surface to hatch into very flat leaf-like larvae (called leptocephalus) that then drift along large oceanic currents back to New Zealand. [14] [17] This drifting is thought to take up to 15 months. [16] There have been no recorded captures of either the eggs or larvae of longfin eels. [14]
Leptocephalus is a genus that was used for species of larval eels, called leptocephali.Leptocephali larvae differ so much in appearance from their adults. When first discovered, leptocephali were thought to be a distinct type of fish, [1] not an eel specie.
European eels live through 5 stages of development: larva (leptocephalus), glass eel, elver, yellow eel, and silver eel.Adults in the yellow phase are normally around 45–65 centimetres (18–26 in) and rarely reach more than 1.0 metre (3 ft 3 in), but can reach a length of up to 1.33 metres (4 ft 4 in) in exceptional cases. [8]
However, while the larvae of true eels are about 5–10% of the length of the adult, those of deep-sea spiny eels can grow considerably larger than the adult, and shrink when they develop into their final form. Thus, while adults range from 20 cm (7.9 in) to 1.2 m (3.9 ft) in length, larvae of up to 1.8 m (5.9 ft) have been recorded. [3]
The larvae recruit from the sea as small adults when they lack colour and are transparent-giving them the name "glass eel". Tropical species have year-round recruitment, whereas temperate species such as the short-finned eel have strong seasonal recruitment. [ 7 ]
The only food items actually found in the stomachs of snipe eels have been shrimp-like crustaceans, though ichthyologists believe they should be capable of catching and eating small fish and cephalopods also. Since predatory fish often feed on eel larvae, it is presumed by scientists and ichthyologists that they feed on snipe eel larvae as well.
Ciona savignyi is a marine animal sometimes known as the Pacific transparent sea squirt or solitary sea squirt. It is a species of tunicates in the family Cionidae . It is found in shallow waters around Japan and has spread to the west coast of North America where it is regarded as an invasive species.
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