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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.
Calamity James, a British comic book character from The Beano; Calamity Jane, a 1953 film based on the person; Calamity Town, a 1942 novel by Ellery Queen; The Calamity, a central plot point for the 2011 video game Bastion; Calamity, a mod for the 2011 video game Terraria "Calamity", a song by Zayn from his 2021 album Nobody Is Listening
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The Amazon molly (Poecilia formosa) is a freshwater fish native to the warm waters of northeastern Mexico and the southern parts of the U.S. state of Texas. [1] [3] It reproduces through gynogenesis, and essentially all individuals are females.
Some common and widespread species are often kept as aquarium fish, while other have very small ranges and are seriously threatened. [3] Species in Poecilia are called mollies (e. g. P. sphenops) or guppies (e. g. P. reticulata) depending on body shape. Micropoecilia has been proposed to be included as a subgenus of Poecilia. [5]
Catostomus is a genus of fish belonging to the family Catostomidae, commonly known as suckers. This genus of fish usually lives in freshwater basins. [ 2 ] Most members of the genus are native to North America, but C. catostomus is also found in Russia.
The prickly leather-jacket is a medium-sized fish which grows up to 31 cm (12 in). [2] The body is highly compressed laterally, stocky, the mouth is terminal; the head size is big proportionally to the body. Dermal appendages are visible mainly on the body's margin and also on the sides. They are part of the fish's camouflage system.
Cobitidae, also known as the true loaches, is a family of Old World freshwater fish. They occur throughout Eurasia and in Morocco, and inhabit riverine ecosystems. Today, most "loaches" are placed in other families (see below). The family includes about 260 described species. New species are being described regularly. [2] [3] [4]