When autumn-spawning bitterling, Acheilognathus rhombea (known as the kanehira
bitterling in Japan) were held under a constant short photoperiod (10 hr light-14 hr dark) at …

The kanehira bitterling, Acheilognathus rhombea, which breeds during autumn in the
underyearlings and during summer and autumn in the yearlings, was exposed to various …

Materials and Methods Juvenile bitterling(TL 10-20 mm) were collected from Lake Biwa
(35•‹ N, 136•‹ E) in June 1981 and May 1982, and reared in an outdoor pond (area, 14m2; …

Ovarian developmental stages and serum steroid hormone levels were examined at six
different times of day (0100, 0600, 1000, 1300, 1600, 2000 h) in a marine teleost, the …

Most of the experiments were conducted with the tiny freshwater teleost, Oryzias Zatipes.
This species, called “Medaka” in Japanese, is native to the Far East and very suitable as the …

Annual, lunar, and diel samplings were taken from a strain of mummichog (Arasaki strain)
reared in outdoor tanks under natural conditions, to examine gonadal maturity. Gonads of …

Mummichog, a spring and summer spawning teleost, were exposed to various photoperiod
and temperature conditions to investigate the environmental regulation of the annual …

To clarify the whole aspect of the annual reproductive cycle of the chichibu-goby Tridentiger
obscurus, we examined the seasonal gonadal changes of adult fish caught from its natural …

Materials and Methods The bitterling were collected from Lake Kasumigaura and its
adjacent rivers, and fed in an outdoor pond(area 14m2, maximum depth 50cm) till …

The annual reproductive cycle, including the first maturity of ovarian development and
plasma levels of testosterone (T) and estradiol-17β (E2), was examined in female Japanese …