Fig. 3. Survival rate of wild-type and bre zebrafish larvae raised at 25°C, 28°C or 31°C during the first days of development. For each group 10 separate batches of animals were observed, with about 100 animals in each batch. Total number of hatched larvae (N) at the beginning of the experiment were 826 (25°C), 802 (28°C) and 467 (31°C) for bre larvae, and 435 (25°C), 716 (28°C) and 809 (31°C) for wild-type larvae, respectively.