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A pregnant Southern platyfish. Pregnancy has been traditionally defined as the period of time eggs are incubated in the body after the egg-sperm union. [1] Although the term often refers to placental mammals, it has also been used in the titles of many international, peer-reviewed, scientific articles on fish.
Marine fish can produce high numbers of eggs which are often released into the open water column. 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 ...
All but one species have three pairs of barbels, with the nasal barbels absent. Most species have very small adipose fins. [3] While Ageneiosus inermis, also known as the fidalgo, is known to reach 59 cm (23 in) in length, most are small, with some species not known at any longer than 3 cm (1.2 in). [3] The eggs are fertilised internally. [3]
The size of the clutch varies proportionately to the size of the female; an average of 2,640 eggs per kilogram of fish are laid. On average each female flathead lays a clutch of roughly 100,000 eggs. The role of the male catfish in fanning the clutch is to provide oxygen to the eggs through the use of his fins.
Fish embryos go through a process called mid-blastula transition which is observed around the tenth cell division in some fish species. Once zygotic gene transcription starts, slow cell division begins and cell movements are observable. [4] During this time three cell populations become distinguished. The first population is the yolk syncytial ...
Generally speaking, cats like to eat fish. In fact, at one point, domestic felines were eating more...
When feeding your cat eggs, it is important to cook them. You should never feed your cat raw eggs. Similar to humans , cats can get foodborne illness – such as salmonella or E. Coli – when ...
In particular, one pair of adult fish is capable of laying 200–300 eggs in one morning in approximately 5 to 10 at time. [29] Male zebrafish are furthermore known to respond to more pronounced markings on females, i.e., "good stripes", but in a group, males will mate with whichever females they can find.