Based on decades of observations, marine biologists assumed that all squids laid their eggs in clusters on the sea floor, where the eggs developed and hatched without any help from their parents. However, through observations of the deep-sea squid Gonatus onyx using MBARI’s ROVs, scientists learned that females brood their eggs, carrying the eggs between their arms until the young hatch and swim away.
Read more about this amazing adaptation here: MBARI
This female Gonatus onyx squid was observed at nearly 2,000 m depth swimming slowly through the water, carrying her sack of eggs. Because they cannot swim very quickly, brooding squid may be easy prey for deep diving marine mammals.