While most fish reproduce by laying eggs, some species are live-bearing, or viviparous, and carry their offspring internally.

If a baby fish manages to avoid being eaten and to find ... blue strands of polyethylene and polypropylene, commonly used to make fishing gear, in the stomachs of larval swordfish, marlins ...

Studies have shown that eating plenty of fish is healthy for pregnant women and their babies. But mercury can harm the developing brain of a baby whose mother eats too much contaminated fish ...

The earliest "babies" known to science have been uncovered in the remains of a primitive fish found in Orkney. Researchers say the unborn embryos discovered in a fossil from the island of South ...

When well cared for, around 80% of babies will make it to adulthood. But in the wild, the number of survivors is much lower.