But this raises the problem of mating with close family members, creating the risk of diseases from too narrow a gene pool. Chen Te-chin thus has been doing genetic tests on each cetacean in order to clarify their exact relationships.
但是為了避免近親交配產生的病變，陳德勤事前會替每隻海豚進行基因鑑定，以釐清血緣關係。