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

Working out the kinks of mating in the animal kingdom helps to gain insights into the survival of species. Among animals that ...

For any animal, releasing sperm cells requires a bit of time and energy. Using up so much energy can keep them from the other ...

WEST LAFAYETTE, Ind. – Purdue University researchers have found that releasing a transgenic fish to the wild could damage native populations even to the point of extinction. A transgenic organism is ...

Osaka Metropolitan University researchers have uncovered a daily mating capacity for medaka, providing important insights ...

Compared with other fish, sex determination in medaka has been closely scrutinized. Homologous targets of Sry — the mammalian gene that directs male development — are known in medaka ...

Working out the kinks of mating in the animal kingdom helps to gain insights into the survival of species. Among animals that have multiple partners ...

Three major approaches were taken: large scale screening of mutant Medaka fish defective in embryogenesis; a Wnt family-focused in-depth investigation of signaling systems; and a modernized revisit to ...

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 ...

"Medaka are among the fish that spawn, where fertilization occurs after the eggs and sperm are released in water. As these gametes are difficult to collect, the number of sperm released and the ...