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Hagfish, of the class Myxini / mɪkˈsaɪnaɪ / (also known as Hyperotreti) and order Myxiniformes / mɪkˈsɪnɪfɔːrmiːz /, are eel -shaped jawless fish (occasionally called slime eels). Hagfish are the only known living animals that have a skull but no vertebral column, although they do have rudimentary vertebrae. [ 3 ]
Anti-predator adaptation in action: the seal shark Dalatias licha (a–c) and the wreckfish Polyprion americanus (d–f) attempt to prey on hagfishes. First, the predators approach their potential prey. Predators bite or try to swallow the hagfishes, but the hagfishes have already projected jets of slime (arrows) into the predators' mouths.
A male fish fertilizes the eggs, and both then work together to protect the eggs/babies from danger until they can defend themselves. In the second method, the male fish uses its anal fin to transmit sperm into the female fish and fertilize the fish eggs.
Chaunax, variously known as coffinfishes, gapers or frogmouths, is a genus of marine ray-finned fishes, it is one of two genera belonging to the family Chaunacidae, the sea toads. They are found in tropical and subtropical oceans around the world typically in deep water.
Lesions begin to form and the octopus literally degenerates. Unable to defend themselves, octopuses often fall prey to predators. [76] This makes most octopuses effectively semelparous. The larger Pacific striped octopus (LPSO) is an exception, as it can reproduce repeatedly over a life of around two years. [75]
The spawn of the anglerfish of the genus Lophius consists of a thin sheet of transparent gelatinous material 25 cm (10 in) wide and greater than 10 m (33 ft) long. [39] Such an egg sheet is rare among fish. The eggs in this sheet are in a single layer, each in its own cavity. The spawn is free in the sea.
Thelenota ananas, a giant sea cucumber from the Indo-Pacific tropics. Sea cucumbers are echinoderms from the class Holothuroidea (/ ˌhɒləˌθjʊəˈrɔɪdiə, ˌhoʊ -/ HOL-ə-thure-OY-dee-ə, HOHL-). They are marine animals with a leathery skin and an elongated body containing a single, branched gonad. They are found on the sea floor worldwide.
Phoxargyrea dayi Fowler, 1903. The Atlantic silverside (Menidia menidia), also known as spearing in the northeastern United States, is a small species of fish from the West Atlantic, ranging from the Gulf of St. Lawrence in Canada to northeastern Florida in the USA. It is one of the most common fish in the Chesapeake Bay and in the Barnegat Bay.