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The spot (Leiostomus xanthurus), also known commonly as the spot croaker, [1] Norfolk spot[2] and the Virginia spot, is a species of small short-lived saltwater fish in the family Sciaenidae. The species inhabits estuary and coastal waters from Massachusetts to Texas, and derives its name from the prominent dark spot behind each gill.
Fish reproduction. A pair of bettas spawning under a bubble nest. Fish reproductive organs include testes and ovaries. In most species, gonads are paired organs of similar size, which can be partially or totally fused. [ 1 ] There may also be a range of secondary organs that increase reproductive fitness.
Pregnancy in fish. Appearance. 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, e ...
The twospot astyanax (Astyanax bimaculatus), [2] [4] also called the two-spot tetra, is a small species of freshwater fish native to South America.It is a middlingly common tetra in the aquarium industry, with hobbyist reports of its sale and presence, and it is also a well-studied member of the genus Astyanax in wild settings.
The spotted garden eel is a small fish that can reach a maximum length of 40 centimetres (16 in; 1.3 ft). Its body is anguiform (eel-like): long, thin, with a circular cross-section (14 millimetres (0.55 in) in average diameter) and a head of the same diameter as the body. The head appears shortened because the large mouth is close to the also ...
The Atlantic croaker (Micropogonias undulatus) is a species of marine ray-finned fish belonging to the family Sciaenidae and is closely related to the black drum (Pogonias cromis), the silver perch (Bairdiella chrysoura), the spot croaker (Leiostomus xanthurus), the red drum (Sciaenops ocellatus), the spotted seatrout (Cynoscion nebulosus), and the weakfish (Cynoscion regalis).
Euglena is a genus of single cell flagellate eukaryotes. It is the best known and most widely studied member of the class Euglenoidea, a diverse group containing some 54 genera and at least 200 species. [ 1 ][ 2 ] Species of Euglena are found in fresh water and salt water. They are often abundant in quiet inland waters where they may bloom in ...
Outline of fish. The following outline is provided as an overview of and topical guide to fish: Fish – any member of a paraphyletic group of organisms that consist of all gill -bearing aquatic craniate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as ...