open access

https://hdl.handle.net/2115/38816

Gonadal Maturation of Female Ribbon Prickleback in Funka Bay, Hokkaido

日本語

産卵期

1995

The Japanese Society of Scientific Fisheries

Bulletin of the Japanese Society of Scientific Fisheries

61(5)

707-712

Gonadal maturation of female ribbon prickleback, Lumpenus sagitta, collected in Funka Bay, Hokkaido, from September 1991 to Mayebruary 1994 was examined histologically. Oocytes from the chromatin nucleolus stage to the migratory nucleus stage were observed in the ovary. Based on the developmental stages of ovarian eggs, the maturity of female of L. sagitta was divided into five stages: the yolk vesicle stage, the oil drop stage, the early yolk formation stage, the late yolk formation stage and the migratory nucleus stage. In January, 91.6% of the femals had oocytes at the yolk vesicle stage and 8.4% at the oil drop stage. In the same period, postovulatory follicles were found in the ovary. Percentages of oocytes at the oil drop stage increased to 80% in May. In the middle of September, all of the females were in the late yolk formation stage. In Novemver, many oocytes at the migratory nucleus stage were observed. These observations, indicate that L. sagitta spawn from December to January in Funka Bay.

学術雑誌論文

Version of Record

© 1995 The Japanese Society of Fisheries Science

0021-5392

1349-998X

AN00193422