ABSTRACT
Magnetoreception is an ability of an organism to perceive, and respond to, effects of the external magnetic field, changes in its direction, intensity, and gradient, the ability being manifested as specific responses. This chapter reviews observations and data on changes in embryonic development, embryonic and larval locomotion, physiological responses, and directional responses of fish embryos and larvae to artificial and natural magnetic fields. It presents magnetoreception in fish embryos and larvae, frequently associated with organismic orientation. After the test magnetic field was switched on, changes in the heart rate were observed to occur with a high regularity. Constant magnetic field and the geomagnetic field were found to affect the direction of embryonic body alignment.
