No one can select tosai for male or female 100%. Some tosai will show the characteristic of male or female 100% but some won?t, and some may be neutral fish. As your knowledge improves you will have better percentage of selecting male or female. These are some guide line when you are selecting male or female tosai.
| Male | Female |
| 1. 80% male develop color early (finished) | 1. 80% female won?t develop color early ( finished) |
| 2.
The beni and shiroji are rough, yellowish skin, or the body white but
the head is yellowish, especially the mouth, nose and cheek area. If the fish have all of the above, 90% chance they are male.male. |
2. Beni and shiroji soft and shiny, the shiroji is even from the tip of the mount, head, cheek to the tail. If the fish have all of the above, 90% chance they are female. |
| 3.
The pectoral fins are thicker. The primary and secondary bone look darker white color tone. If you have 20/20 eyes sight you may see the little stars in pectoral fins. If you're good at this technique, it would be almost 100% male selection. |
3.
The pectoral fins are thin, look translucent. The primary and second bone look lighter in color and won't have little stars in pectoral fins. It you are good at this technique, you'll get almost 100% female selection. |
| 4.
Anus look tear drop, look long and sink in. Possible 90% male. |
4.
Anus round and rise up, it does not sink in. Possible female 99% |
If you master all 4, you will be able to select male or female 95% or more.
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