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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.
Fishes are a paraphyletic group and for this reason, the class Pisces seen in older reference works is no longer used in formal taxonomy.Traditional classification divides fish into three extant classes (Agnatha, Chondrichthyes, and Osteichthyes), and with extinct forms sometimes classified within those groups, sometimes as their own classes: [1]
Most male fish have two testes of similar size. In the case of sharks, the testes on the right side is usually larger [citation needed].The primitive jawless fish have only a single testis, located in the midline of the body, although even this forms from the fusion of paired structures in the embryo.
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
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.
Commercial fisheries exist for the largest species, making them important food fish. However, the U.S. Food and Drug Administration warns pregnant or breastfeeding women against eating tilefish and some other fish due to mercury [broken anchor] contamination. [6] [7] Exceptionally colorful smaller species of tilefish are favored for aquariums.
Cuttlefish eat small molluscs, crabs, shrimp, fish, octopuses, worms, and other cuttlefish. Their predators include dolphins, larger fish (including sharks), seals, seabirds, and other cuttlefish. The typical life expectancy of a cuttlefish is about 1–2 years. Studies are said to indicate cuttlefish to be among the most intelligent ...
It is a demersal fish native to marine or brackish waters of the Northeast Atlantic, Baltic Sea and the Mediterranean Sea. It is an important food fish. [ 4 ] Turbot in the Black Sea were often included in this species, but are now generally regarded as separate - the Black Sea turbot or kalkan ( S. maeoticus ). [ 5 ]