[2][5] The coloration is generally grayish tan to brown above; some individuals have several pairs of faint ocelli.

[4] If threatened by a predator, it exhibits a characteristic defense behavior in which it erupts from the bottom, arches its back, and performs a "somersault" in the water column.

[8] Reproduction is ovoviviparous, in which the developing embryos are nourished by uterine "milk" produced by the mother.

[2] The reproductive cycle is annual, with ovulation and fertilization taking place in July and August.

[10] Known parasites of the giant electric ray include the tapeworms Acanthobothrium franus and A. inbiorium, and the copepod Taeniacanthodes dojirii.