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Just before birth, the eyes of fry may be seen through the translucent skin in this area of the female's body. [64] When birth occurs, individual offspring are dropped in sequence, typically over a period of one to six hours. The female guppy has drops of two to 200 fry at a time, though typically ranging between 30 and 60. [65]
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 .
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The original japan blue wild type guppy was a Poecilia reticulata collected from Lac du Rorata. Lac du Rorota is a reservoir in French Guiana. Karen Koomans received a single male japan blue guppy and crossed it with Cumana Endler females to preserve the strain. Karen Koomans introduced this strain to the hobby as the 'Japan blue wild type guppy'.
Genetic modification is conducted in some hatcheries to improve the quality and yield of farmed species. Artificial fertilisation facilitates selective breeding programs which aim to improve production characteristics such as growth rate, disease resistance, survival, colour, increased fecundity and/or lower age of maturation. [7]
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.
A number of studies have shown that fish can retain information for months or years. Anecdotally, channel catfish (Ictalurus punctatus) can remember the human voice call announcing food five years after last hearing that call. [19] Goldfish remember the colour of a tube dispensing food one year after the last tube presentation. [19]