Format Tail Guppy Fish
Rating on format guppy’s tail
Guppy Veiltail (veil tail): The caudal fin should have the shape of an isosceles triangle of 45, 10/10 body length
Guppy Triangle tail (delta tail): The caudal fin should have the shape of a triangle of 70, 8/10 of the body length.
Fantail Guppy (fan/blower): The caudal fin is gently curved in the upper and lower edges. Its length corresponds to 8/10 of the body length.
Scarftail Guppy (scarf/flag): The flow has a rectangular shape and its length corresponds to 8/10 of the body length.
Double Swordtail Guppy (double swordtail): The caudal has an oval basic shape and two sword-shaped extensions on the upper and lower tail rays.
Top Swordtail Guppy (upper blade): The flow has an oval basic shape and a sword-shaped extension on the upper radius
Bottom Swordtail Guppy ( lower) Sword: The flow has an oval basic shape and a sword-shaped extension on the lower radius.
Lyretail Guppy (tail Lira): The flow has the shape of a lyre. The basic shape is round and should not exceed 4/10 of the body length.
Cofertail Guppy (paddle-shaped tail): The shape of the flow looks like a shovel. The onset of flow is round and opens parallel to the body axis.
Speartail Guppy (lance-shaped): The flow has the shape of the tip of a spear. Its length corresponds to 8/10 of the body length.
Roundtail Guppy (round tail): The caudal is round with a diameter of 5/10 of the body length.
Guppy Pintail (pintail): The basic shape of the caudal is rounded, with a diameter of 4/10 of the body length. The back is fine and rises, steep at first. Already the end is pointed and tapers from the last third of its length.


information from
https://en.wiktionary.org/wiki/Poecilia_reticulata