PLOS ONE · 9 authors, 2 centres
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Embryos of Downs herring were experimentally reared at 8°C, 10°C, and 14°C from fertilization to hatching, and higher temperatures negatively affected fertilization rate, egg diameter, hatching rate, and yolk sac volume. Substantial family-level variability and maternal attribute effects were also detected for key embryonic traits.
This experimental study assessed the impact of three constant temperature regimes (8°C, 10°C, and 14°C) on embryonic development of Downs herring (Clupea harengus) from fertilization to hatching under standardized controlled conditions. Key traits measured included fertilization rate, mean egg diameter at eyed stage, hatching rate, yolk sac volume, and developmental stage frequency of newly hatched larvae. Overall negative impacts of increased temperature were found on fertilization rate, mean egg diameter at eyed stage, hatching rate, and yolk sac volume, with a faster developmental rate and altered development stage frequency observed at higher temperatures. A strong variability in trait values across families was demonstrated for four key traits. Limitations include the use of constant temperature regimes rather than fluctuating temperatures, a limited number of families, and the single-stressor design.
