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The guppy (Poecilia reticulata), also known as millionfish or the rainbow fish, [3] is one of the world's most widely distributed tropical fish and one of the most popular freshwater aquarium fish species. It is a member of the family Poeciliidae and, like almost all American members of the family, is live-bearing. [4]
It requires a temperature of 24 °C (75 °F) to 28 °C (82 °F). The fish is intolerant of stagnant water, being susceptible to bacterial infections, making it necessary to change about 30% of the aquarium water twice a month. Aquatic plants help reduce its natural skittishness. [2] The knife livebearers are best kept in a single species aquarium.
Livebearers are fish that retain their eggs inside the body and give birth to live, free-swimming young. They are especially prized by aquarium owners. They are especially prized by aquarium owners. Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include: guppies , mollies , platies and swordtails .
Adaptive hypotheses, including the locomotor hypothesis, [7] Trexler-DeAngelis Model [8] (reproductive allotment), and life-history facilitation, [9] [6] broadly suggest that the placenta evolved to facilitate the evolution of another advantageous trait in the fish's environment. The conflict hypothesis suggests the placenta is a nonadaptive ...
The zebrafish (Danio rerio) is a freshwater fish belonging to the minnow family of the order Cypriniformes.Native to South Asia, [2] it is a popular aquarium fish, frequently sold under the trade name zebra danio [3] (and thus often called a "tropical fish" although it is both tropical and subtropical).
Live-bearing fish exhibit either vivipary or ovovivipary and sometimes both. Note : If a species or grouping of fish species appears here and is known to be either ovoviviparous or viviparous please redirect to the relevant category.
Every now and then, photos of weird wildlife surface on the internet and cause absolute chaos on social media.In June, the Twitterverse went wild when an old photo of a human-sized bat in the ...
Poecilia vivipara, sometimes called the southern molly, is a small euryhaline livebearer fish distributed along the Atlantic coast of South America. It is most frequently found in standing brackish water. It has been introduced outside its native range to control mosquito populations and is occasionally kept in home aquariums.