The absence of magnetic fields can affect fish embryogenesis. The influence of hypomagnetic field on the survival of roach (Rutilus rutilus) embryos was estimated. Delayed consequences of R. rutilus embryos and prelarvae exposure to these magnetic conditions were also studied. Hypomagnetic field during embryogenesis led to an increased mortality of embryos. The juveniles developed from the exposed embryos were characterised by reduced vertebral phenotypic diversity. The influence of hypomagnetic field on roach prelarvae led to changes in the size–mass indices of juvenile fish. Present results differ from those that were previously obtained in experiments with simulated geomagnetic storms and artificial low-frequency magnetic fields and emphasise the importance of the magnetic environment for the fish embryogenesis. Possible mechanisms of the described effects are discussed.

磁场的缺乏会影响鱼类的胚胎发生。估计了低磁场对蟑螂（Rutilus rut​​ilus）胚胎存活的影响。迟发后果R.鲤还研究了胚胎和幼虫在这些磁性条件下的暴露。胚胎发生过程中的低磁场导致胚胎死亡率增加。从暴露的胚胎发育的幼虫的特征是椎体表型多样性降低。低磁场对蟑螂前幼体的影响导致幼鱼的大小质量指数发生变化。目前的结果不同于先前在模拟地磁风暴和人造低频磁场实验中获得的结果，并强调了磁环境对鱼类胚胎发生的重要性。讨论了所描述效果的可能机制。