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

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 ...

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 ...

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 ...

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 ...

But mating isn’t the only reason these tiny fish roar. The loud sounds may also serve as a deterrent to predators. In the fish’s clear-water habitat, where it might otherwise be vulnerable due ...

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 ...

Betta fish—also known as Siamese fighting fish ... olive, or brown. Before mating, the male spends hours blowing bubbles at the water’s surface to build what’s called a mucus bubble ...

Researchers have recently witnessed behavior in the wild that could offer critical clues about how the endangered whale shark ...

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 ...