guppy

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guppy

a small aquarium fish up to 1.5 inches long in many color combinations. Called also Poecilia reticulata.
References in periodicals archive ?
Guppies need plants and little structures, like castles, in their tank.
So, while the behavior of all the guppies changed depending on the situation - for example, all becoming more cautious in more stressful situations - the relative differences between individuals remained intact," Houslay said.
Researchers deployed guppies in several streams as part of a study on evolutionary change.
If guppies were dependent only on carotenoids for their orange coloration, one would expect to find large changes in the color of their orange patches because the availability of algae varies by location.
When we compare those results (redrawn in Figure 2) with the response to the crayfish (right panels in Figure 2), the most striking difference is the willingness of solo guppies to approach the barrier during the chemical-only trial.
Male guppies spend most of their time displaying to females.
The fish used in this study were healthy, wild-type guppies (Poecilia reticulata) imported from Colombia and bred through several generations in 500-L stainless-steel tanks at 25 [+ or -] 2 [degrees] C and a daily 12-hr simulated daylight illumination.
Three 10 gallon aquarium tanks filled with de-chlorinated tap water were stocked with guppies and black mollies from a local supplier.
If the age-specific predation hypothesis is true, then we predict that the mortality rates of juvenile guppies relative to adults will be high in Rivulus localities.
Reznick explained that male guppies are brightly colored and very variable in coloration.
However, when he and his colleagues compared guppies from streams with many predators with streams posing few threats, the prediction failed.
Though the differences are tiny - imperceptible to a layperson - the researchers found that the lizards were changing physically at a pace rivaled only by the Trinidad guppies.