Guppy Personality Traits

I haven't came across much on guppy behavior aside from them being considered "schooling" or "community" fish, basically meaning they like to be kept with other fish (preferably their own kind I'd assume).
Honestly males and females act totally different most of the time...

~Males tend to chase, school together and occasionally pick a fight with other males.
~Females act more independent, not always looking for affection and generally eat more.

In a guppy world where eating and breeding are basically what they do, it only makes sense that they generally act this way. Occasionally I will see a guppy showing unusual behavior then its tank mates, which makes me question their true intelligence and individuality.

Here are two examples of this individual personality...

During a full tank cleaning I began removing all my guppies from the tank, which guppies are generally very easy to net as opposed to other fish I have. After checking to make sure no guppies were left in my tank I began to scan the water to see if I had any possible fry hiding in the gravel. Upon my visual search I then barely noticed one adult female cowering and hiding behind my filtration system, this was an unusual personality trait in my usually friendly guppies.

I had a female store bought guppy that really only felt comfortable around younger fish and fry, but it took me observing my fish daily to realize her behavior didn't seem too normal. I remembered when I had purchased her it was just her and tiny fry living together in a busy frequented pet store. She was either infertile or was reluctant to mate, as the entire time I had her (over a year at least) she had never reproduced. She was much more shy around older guppies and she would even occasionally stress herself resulting in an ick outbreak (but this was only once in a blue moon) while my other guppies were all happy, never had an ick outbreak and age was never an apparent issue.


Although I've found that some guppies act different in major ways it makes me question how different each guppy personality really is and if their relationships, health, well-being and so forth can change a guppies personality traits (rather then its mood on occasion as when a fish is ill), or if it's just an inheritated trait much like the way the majority of my males and females generally behave.

Sexing Guppy Fry

I believe I've figured out how to sex tiny guppy fry and it doesn't seem to be a super easy task but here's a new method which I believe MIGHT be accurate from my knowledge of guppy breeding (I haven't done any outside research on this topic).

Guppy fry are about a few millimeters in length with possibly no color thus far and it may take a few weeks or perhaps days to actually tell your male and female guppies apart using my method here. It helps to have a bright tank light on and to use your eyes rather then up-close photos to actually them apart.

As tiny guppies you may notice if you look VERY closely that some of the fry actually flex their gonopodium up toward their bodies and back out again, the guppies you see doing this are probably males as adult males are generally doing this during mating rituals with females. It may take some patience to see a guppy flex its gonopodium but if you can at least get a good visual on the transparent fins then it makes it slightly easier. If it doesn't flex its gonopodium after at least 5 minutes of viewing then it's possibly a female.

Another way is to look at the shape and size of their bodies. Female fry I believe are slightly more rounded in the chest/belly area and males tend to be slender/straight thus appearing very slightly smaller then female fry.