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Catshark egg (mermaids' purse) Many species of catsharks, like the chain dogfish, are oviparous and lay eggs in tough egg cases with curly tendrils at each end, known as "mermaid's purses", for protection, onto the seabed. [15] Almost a year is needed for a catshark to hatch from the egg.
Twig catfish can be induced to breed at any time, if in good condition, in captivity. [2] In the aquarium the male will clean a hard surface (usually the aquarium wall) and the female lays its eggs at night or early morning. [2] The female normally lays a clutch of about 60 to 80 eggs on this surface.
Silurus punctatus Rafinesque, 1818. The channel catfish (Ictalurus punctatus) is North America 's most numerous catfish species. It is the official fish of Kansas, Missouri, Nebraska, and Tennessee, and is informally referred to as a "channel cat". In the United States, they are the most fished catfish species with around 8 million anglers ...
A batch of milt and eggs is released followed by a vigorous swish of the female's tail to distribute the eggs over a wide area. The pair usually rests after mating (from seconds up to several minutes) and then resumes mating. Parental care for ensuring the survival of the catfish offspring is absent except by the careful choice of a suitable site.
The eggs have an average diameter of 1 millimetre (0.039 in). The eggs are generally surrounded by the extraembryonic membranes but do not develop a shell, hard or soft, around these membranes. Some fish have thick, leathery coats, especially if they must withstand physical force or desiccation. These type of eggs can also be very small and ...
The chain catshark or chain dogfish (Scyliorhinus retifer) is a small, reticulated catshark that is biofluorescent. The species is common in the Northwest Atlantic, Gulf of Mexico, and Caribbean. [2] It is harmless and rarely encountered by humans. [3] It has very similar reproductive traits to the small-spotted catshark (S. canicula).
Synodontis multipunctatus, also known as the cuckoo catfish, combines mouthbrooding with the behavior of a brood parasite: it eats the host mouthbrooder's eggs, while spawning and simultaneously laying and fertilizing its own eggs. The mouthbrooder (typically a cichlid) incubates the cuckoo catfish young, the catfish eggs hatch earlier than the ...
Ameiurus vulgaris (Thompson, 1842) The black bullhead or black bullhead catfish (Ameiurus melas) is a species of bullhead catfish. Like other bullhead catfish, it has the ability to thrive in waters that are low in oxygen, brackish, turbid, and/or very warm. [2] It also has barbels located near its mouth, a broad head, spiny fins, and no scales ...