Like other members of the order Lamniformes, the bigeye thresher is an aplacental, viviparous species with intrauterine oophagy
, bearing 2-4 pups per litter, resulting in an extremely low fecundity (Moreno and Moron, 1992; Gilmore, 1993; Chen et al.
For example, these include notes on oophagy
by eels, consumption of eel leptocephali by bluefish, and taxonomy of Cyprinodon.
This unusual process is called oophagy
(from the Greek oion, meaning egg and phagy eat.
As in other lamnids, young are nourished through oophagy.
Lamnid sharks are ovoviviparous and nourish their embryos by oophagy (Lohberger, 1910).
A slight modification to our knowledge of oophagy would be the possible consumption of the late-fertilized ova capsules that had small undeveloped and decomposing embryos along with unfertilized ova, as mentioned previously.
Gilmore (1993) reviewed the reproductive biology of lamnoid sharks and included a redrawn sketch of the Sanzo (1912) embryo, still identified as a white shark, and also incorrectly stated that Sanzo (1912) had documented oophagy
for the white shark.