How to breed Japanese Blue Grass Guppy – Part III: Key points for picking a male Blue Grass as parent fish

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In general, the selection standards of male Blue Grass include four main aspects: body shape, fins shape, pattern, and color.

About fish age

Usually, we pick 2 to 6-month-old male fishes as parent fishes. 2-month-old fishes are the best, because they can be parent fishes for 4 months. But it’s a little difficult to confirm whether a two-month-old fish meets the standards because it is still growing.

Next, we talk about the four main aspects.

1. Body shape

This standard is fit for all types of guppies.

a. Size

Usually, the length of whole fish needs to be more than 4cm(1.57inches), of course the bigger the size the better. The length ratio of caudal fin to body is at least 1:1, it’s better that caudal fin is longer than the body. This size standard is fit for all varieties of guppies.

b. Caudal peduncle

General speaking, the best caudal peduncle is thick and short. Such a caudal peduncle can better support dorsal fin and caudal fin, making the swimming stroke more beautiful and elegant.

c. Junction

The junction means the connection between dorsal fin or caudal fin and fish body, the bigger the better.

2. Fins shape

a. Caudal fin

There are two tail shape of Blue Grass, fan tail and delta tail. And we will choose the one who has a big included angle, wide, and thick tail.

Guppy Fish Tail Shape (source – CC BY-SA 4.0)

b. Dorsal fin

Dorsal fin also needs to be big, wide, and thick. And the pattern on dorsal fin is the same as the grass tail.

It’s important to point out that don’t just emphasize the large dorsal fin and ignore the tail. The genes that control the size of the dorsal fin and caudal fin restrict each other. Someone has bred one type of large dorsal fin guppy for commerce. But the tail of this guppy is very short and small, looks very uncoordinated overall. We can say that this type ruined the beauty of guppies.

In a word, what we pursue is coordination and well-proportioned.

3. Patterns

a. Black speckles

The black speckle is the Iconic feature of Blue Grass Guppy. The quality of speckles directly determines the level of Blue Grass. Let’s see the requirements.

  • i. The speckles evenly distribute on dorsal fin and caudal fin. The speckles are all round shape, the smaller and more exquisite the higher quality.
  • ii. The speckles must be full of sense of concavo-convex, just like paste on the fins.
  • iii. In usual, the size and spacing of speckles on dorsal fin are bigger than on caudal fin. The smaller the difference, the better the quality.

b. Diamond marking

The diamond marking is the unique characteristic of Grass Guppy. It appears on the sides. The good diamond marking begins from the pectoral fin, and cover to caudal peduncle, and in dense color.

4. Color

Blue Grass Guppy, as its name suggests, we favor the endless blue. The bluer the more beautiful. Previously, Blue Grass was very blue, but there is yellow marking on the root of tail. That’s natural color. Because Blue Grass is a hybrid with heterozygous blue and red alleles. And some people tried to remove the yellow marking by hybridization, but the side effect is the blue became lighter. As the saying goes, You can’t have your cake, and eat it. For the choice of color, follow your own aesthetic.

Today, we talked about the key points for picking a male Blue Grass. In the next article, we will introduce female Grass Guppy. Stay tuned.

Related posts

Three kinds of most popular Guppy in Japan – Blue Grass

How to breed Japanese Blue Grass Guppy – Part I: Genetic formulas for Blue Grass Guppy

How to breed Japanese Blue Grass Guppy – Part II: Which formula will we use

How to breed Japanese Blue Grass Guppy – Part III: Key points for picking a male Blue Grass as parent fish

How to breed Japanese Blue Grass Guppy – Part IV: Key points for picking a female Grass Guppy as parent fish

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