But there can be no doubt that very many other pelagic animals, when alive, are phosphorescent.
On two occasions I have observed the sea luminous at considerable depths beneath the surface.

Near the mouth of the Plata some circular and oval patches, from two to four yards in diameter, and with defined outlines, shone with a steady but pale light; while the surrounding water only gave out a few sparks.

The appearance resembled the reflection of the moon, or some luminous body; for the edges were sinuous from the undulations of the surface.

The ship, which drew thirteen feet water, passed over, without disturbing these patches.

Therefore we must suppose that some animals were congregated together at a greater depth than the bottom of the vessel.
Near Fernando Noronha the sea gave out light in flashes.