Vertebral variation in zebrafish (Brachydanio rerio) related to the prefertilization temperature history of their parents

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Abstract
Four breeding pairs of zebrafish were maintained at a low temperature (21, 22, or 24 °C), and their eggs placed immediately after laying at one of a variety of temperatures (ranging between 21 and 33 °C). in which they were reared until vertebral count was determined. The same breeding pairs were at another lime maintained at a high temperature (29 or 30 °C), and eggs were similarly placed for rearing at one of a variety of temperatures. Vertebral counts were compared between sets of samples reared at the same temperature and originating from the same parents but laid during periods with different parental holding temperatures. In the three cases where differences between such pairs were statistically significant, vertebral counts were higher in the sample originating from the higher parental holding temperature. If meristic characters are in fact partly dependent on temperature history of the parents before fertilization, many published experimental and racial studies may need to be reinterpreted.

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