Pintail or Speartail Guppies


I started messing around with a line of these a few months ago. It’s a useless fish in terms of the IFGA, as there is no point class for it. I was trying to decide if this line is considered a pintail, or a speartail. It seems like there is some crossover.  Here is a typical “traditional” guppy tail chart for reference:


My thought is that a speartail is a rounded tail that simply comes to a “flame” point. A pintail is a round tail that comes to a point, but then continues extending beyond that point with a tapering, linear pin. If I look at the chart above, my breeder male wouldn’t fit as a speartail because the point continues traveling beyond where a clean taper would naturally fall. In other words, the point is too long. But according to the diagram, it’s not a pintail because there’s too much taper. If you look closely at the diagram, it’s as if the pintail has a round caudal and there is a sharp and immediate transition into the pin. In my breeder, the tail tapers to a pin.

In my opinion, if there is any “pin” at all, it should be categorized as a pintail. If the last 1/8th inch of his tail was removed, he would be a speartail.

Here’s an example of young F1’s that are beginning to develop from this line.



Someone on a Facebook group mentioned how ugly the females are in this line, and it’s true. I initially thought the females in this line had some type of parasite that flattened their torsos. That horizontally compressed body trait must be part of the genetic makeup that helps bring the male caudals to a point at the end. Probably half of the females had such compressed bodies that they seemed deformed and barely able to function. After culling back to the better females, I have a few decent fish to work with in the F1 generation. Really, you only need a pair to get things going, so I am ahead in the game.

I had planned to cross these into some of my other fish to create new color combinations. But I decided to just cross the F1 females back to the original male. I feel like this line is tricky and every cross is critical. Otherwise, the pin shape could be lost and I’m stuck with fish that are taking up tank space. It seems like from what I’ve read that they are a compatible cross with double and single swordtails to maintain the lines or give them extra hardiness, or even develop the dorsal length.

A few other snapshots around the fishroom:

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