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Population density also matters in simpler environments because higher intraspecific competition causes a decrease in reproductive rate and somatic growth rate, and a corresponding increase in juvenile mortality rate due to cannibalism. [22] It was confirmed that in low-predation environments, guppy populations are in part regulated by density ...
Guppy fry. 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. Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include: guppies, mollies, platies and swordtails.
Guppies are highly prolific livebearers [43] giving birth to between five and 30 fry, though under extreme circumstances, she may give birth to only one or two or over 100. The gestation period of a guppy is typically 21–30 days, but can vary considerably. The area where a pregnant guppy's abdomen meets the tail is sometimes called the ...
When they have developed to the point where they are capable of feeding by themselves, the fish are called fry. When, in addition, they have developed scales and working fins , the transition to a juvenile fish is complete and it is called a fingerling , so called as they are typically about the size of human fingers .
Poecilia wingei is a very colorful guppy species, similar to the fancy guppy often found in pet shops. The species was first collected from Laguna de Patos in Venezuela by Franklyn F. Bond in 1937, and rediscovered by Dr. John Endler in 1975.
Robert John Lechmere Guppy (1895) [1] considered this species synonymous with the taxon Schrammia schrammia (Crosse, 1872) from Guadeloupe, but that species is larger and higher-spired, and therefore Guppy's name was resurrected. Horace Burrington Baker (1927) [2] suggested that Guppy's species probably belongs in the genus Alcadia, subgenus Idesa.
Cyprinodontiformes / ˌ s ɪ p r ɪ n oʊ ˈ d ɒ n t ɪ f ɔːr m iː z / is an order of ray-finned fish, comprising mostly small, freshwater fish. [1] Many popular aquarium fish, such as killifish and live-bearers, are included.
Najas guadalupensis is a species of aquatic plant known by the common names southern waternymph, [4] guppy grass, najas grass, and common water nymph.It is native to the Americas, where it is widespread.