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The males do not have to compete with other males, and female anemone fish are typically larger. When a female dies a juvenile (male) anemone fish moves in, and "the resident male then turns into a female and reproductive advantages of the large female–small male combination continue". [22] In other fishes sex changes are reversible.
In Sweden it is common in all regions except the northernmost mountains and on the island of Gotland, and it is the provincial fish of Västmanland. The Swedish record weight is 12.007 kg. [19] The arguably most popular fish in Swedish fresh water is the European perch, and the annual catch is around 2,000
Female triplewart seadevil, an anglerfish, with male attached near vent (arrow) Some species of anglerfish also display extreme sexual dimorphism. Females are more typical in appearance to other fish, whereas males are tiny rudimentary creatures with stunted digestive systems.
A number of different species, most belonging to the family Clupeidae, are commonly referred to as herrings.The origins of the term "herring" is somewhat unclear, though it may derive from the same source as the Old High German heri meaning a "host, multitude", in reference to the large schools they form.
Roach generally spawn at the same location each year. Large males form leks, which females enter. [7] Males trail the females and fertilize their eggs. Their behaviour is rough and the fish often jump out of the water. A female can lay up to 100,000 eggs. When the pH of the water is below 5.5, the roach cannot reproduce successfully. [3]
Marlins have a continuous fossil record from the Miocene onwards, with the oldest uncontroversial fossil dated to 22 million years ago. [7] It is thought that they probably evolved in the Paratethys Sea. [8] The following fossil genera are known: [9] [10] †Morgula Gracia et al., 2022
There's a new study of Earth's marine life that suggests the ocean has gotten alarmingly roomy. To put a finer point on it, there are half as many fish in the sea today as there were in 1970 ...
Considered by many scientists the fastest fish in the ocean, [8] sailfish grow quickly, reaching 1.2–1.5 m (4–5 ft) in length in a single year, and feed on the surface or at middle depths on smaller pelagic forage fish and squid. Sailfish were previously estimated to reach maximum swimming speeds of 35 m/s (125 km/h), but research published ...