In order to be officially classified as caviar, roe must come from a sturgeon. There is no such thing as "tuna caviar," even if the tuna roe is brined, salted, and served exactly as caviar might.

Failure of chromosomal organization within human egg and sperm cells result in miscarriages and infertility. However, the mechanisms controlling these processes are not understood.

A single-cell fish egg evolves into a multi-cell embryo in less than two hours after fertilization. Within these two hours, the cytoplasm, which will later form the animal body, must separate ...

Masago roe comes from smelt, small fish similar to trout in structure. Ikura, also called red caviar, refers to salmon eggs. These three types of roe are sometimes confused or substituted for caviar.

Splash tetras lay their eggs outside of the water, but how do they do this, and why? Learn more about their unique ...

Parental egg-care in fish traps them in an evolutionary dead-end through the loss of the chorion-hardening system, according to scientists from the Institute of Science Tokyo. Fish have diverse ...

The eggs of marine fish are so difficult to discern from one another that even aquarium curators like Kylie Lev, who works at the California Academy of Sciences’ Steinhart Aquarium, often have ...

Masago is a type of fish egg, or roe, often used in sushi. It has several beneficial nutrients, including protein and heart-healthy omega-3 fatty acids. But it also tends to be high in sodium, so ...

In the lab, a few carp eggs survived and even hatched after being pooped out by ducks. The finding may help explain how fish reach isolated waterways.