The amount of sperm released decreased sharply with each mating during a single day, reducing the males' fertilization rate.

The adult fish that make the journey, of which there are millions, have a particularly obnoxious mating call that, when multiplied, can be downright hostile to the ears. The mating calls of the ...

But just what are the upper limits of gamete production? For a tiny fish called the medaka (Oryzias latipes), males have a mating capacity of 19 times per day. The findings are detailed in a study ...

Observations of mating behavior in whale sharks are very ... behaviors in other species within the subclass of cartilaginous fish that the whale shark belongs to," study co-author Christine ...

He said the likely cause is amorous black drum fish, which are in their mating season right now and typically rendezvous at night. The low-frequency drumming sounds are produced when the fish flex ...

3. Shoaling Up Offers More Breeding Options While mating, fish can be extremely vulnerable to attacks from predators. Grouping up can alleviate ... [+] some of that risk. Shoaling behavior among ...

and 30 percent fewer transgenic fish survived to that age. The researchers calculated that large males had a four-fold mating advantage, based on observations of wild-type medaka. Computer models then ...