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The area where a pregnant guppy's abdomen meets the tail is sometimes called the "gravid patch", or "gravid spot". When pregnant, there is a slight discoloration that slowly darkens as the guppy progresses through pregnancy. The patch first has a yellowish tinge, then brown and become deep orange as the pregnancy develops.
The brood pouch may have moved locations when there was strong a correlated selection for a prehensile tail and diminutive size, resulting in a very small, trunk brooding organism. [15] Viviparity and male-pregnancy in Syngnathidae have a complex evolutionary history with many independent origins of similar traits.
Many are very weak swimmers in open water, moving slowly by means of rapid movements of the dorsal fin. Some species of pipefish have prehensile tails, as in seahorses. The majority of pipefishes have some form of a caudal fin (unlike seahorses), which can be used for locomotion. [2] See fish anatomy for fin descriptions.
The ridge scaled rattail [2] or ridge-scaled grenadier, [3] Macrourus carinatus, is a species of deep-water fish in the family Macrouridae. [1] [2] It has southern circumglobal distribution in temperate to subantarctic waters (34°S–65°S) and is found in the Southern Atlantic, Indian and Pacific Oceans and in the Southern Ocean [1] [2] at depths of about 200–1,200 m (660–3,940 ft).
The coelacanth — a giant weird fish still around from dinosaur times — can live for 100 years, a new study found. Females don’t hit sexual maturity until their late 50s, the study said ...
Generally, males reach 1.5 in (3.8 cm) and females 2.5 in (6.4 cm). These fish are a livebearer species, and as such, the females are larger and more rounded than the males. Pregnant females are also easily recognizable by their gravid spot; a darker area on their bellies where they hold the fry.
The rummy-nose tetra (Petitella rhodostoma) is a species of tropical freshwater characin fish originating in South America, popular among fishkeepers as a tropical aquarium fish. [2] One of many small tetras belonging to the same genus, it is on average 5 cm (2 in) long when fully grown. [ 3 ]
Hemigrammus ocellifer is a South American freshwater fish, also known by the Common names of beacon fish, beacon tetra, head-and-tail light tetra and head-and-taillight tetra. [3] [4] It is found in the rivers of Guyana, Suriname, French Guiana, and the Amazon Basin of Brazil and Peru. Most specimens offered for sale in the aquatics trade are ...