Not quite two years ago physicians and prospective parents welcomed the news that a small, carp-like fish could tell whether or not a woman was going to have a baby (TIME, Jan. 7, 1935). Called ...

Reproduction of native and invasive bitterling fishes and their hybridisation was studied in Japan. We collected mussels in which these bitterlings lay their eggs, kept them in aquaria, collected eggs ...

The minute a woman becomes pregnant certain hormones appear in her urine. If she wants to make sure of her pregnancy and can afford the expense, she may send a vial of her urine to her obstetrician.

Bitterling fishes (Subfamily: Acheilognathinae) spawn in the gills of living freshwater mussels obligately depending on the mussels for reproduction. On the Matsuyama Plain, Japan, populations of ...