Triploidy Induction in an Atherinid Fish, the Pejerrey (Odontesthes bonariensis)

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Abstract
Experiments were conducted on triploidy induction and effects of triploidy on growth and survival of embryos, larvae, and juveniles of pejerrey, a freshwater atherinid fish. Eighty minutes of cold shock (0.5–0.8°C) starting 6 min after egg activation at 18.5°C consistently induced 100% triploidy, as assessed by chromosome counting of juvenile offspring from five different females. Cold-shocked groups had mean relative survival rates of 94.26, 84.15, 53.16, 65.97, and 68.60% at 20 h and 6–7 d after egg activation, at hatching, and at 2 and 20 d after hatching, respectively. Cumulative mortality among cold-shocked groups up to 20 d after hatching exceeded 80%. Critical mortalities were encountered between the eyed-egg stage and a week after hatching. Triploids showed higher rates of embryo and larval abnormalities (ocular malformation, dilation of the pericardial cavity, bulges in the head, and curling or bending of the body). Triploid larvae and juveniles had variable performance in short-term sur...

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