Triploids, in particular, are characterized by the problems of chromosomal pairing and segregation during meiosis, which may cause aneuploid gametes and results in sterility. Thus, they are generally considered to reproduce only asexually. ... Fully sexualized worms begin reproducing by copulation rather than fission.

Why are triploids sterile?

Triploid fish simply have 3 sets of chromosomes instead of 2 and for this reason are not able to reproduce, but are otherwise normal fish. ... Using pressure treatment at a specific time in the egg development, the polar body and chromosome is retained. With 3 chromosomes the fish is sterile and cannot reproduce.

Are triploids fertile?

The natural triploid is 80 percent fertile, and morphologically similar to A. shortii. The unexpectedly high fertility of the triploid hybrids may be due to any one, or some combination, of a number of factors.