2. Understand the age and reproductive number of fish.

3. When selecting small fish, we should first exclude the incomplete and morbid larvae.

4. The distribution of luminous beads on larvae should not be too small.

5. The scale of larval ink spots should be obviously generated from beginning to end (the scale of larval ink spots varies greatly, even if they are connected in a line, the most important thing is to be clear and obvious).

6. When the larval fish 1.5 inch, you can tell whether it is short or not when you grow up, so you should choose a wider, rounder and bigger larval fish.

7. The fin should be stretched upright and the tail fin should be wide (fan tail). Advise you whether to raise arhat or buy sub-adult arhat seedlings. There may be almost no beginning, but it's ugly, not the head.