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CTSA# 134

Aquafarmer Information Sheet: Triploid Chinese Catfish

Arlo W. Fast, Ph.D.


Opening Paragraph:
Triploidy induction is a process whereby an entire chromosome set is added to a fertilized egg. Normal individuals are diploid (2N), receiving one chromosome set (1N) from each parent. Triploid (3N) individuals have an additional chromosome set derived from the second polar body (1N). The second polar body is produced during an egg’s meiotic cell division and is normally lost soon after fertilization. If appropriate shock is applied soon after fertilization, the second polar body is retained by the fertilized egg, thus producing a triploid individual.
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