Reproductive biology of female Rikuzen sole (Dexistes rikuzenius)*

Narimatsu, Yoji and Kitagawa, Daiji and Hattori, Tsutomu and Onodera, Hirobumi (2005) Reproductive biology of female Rikuzen sole (Dexistes rikuzenius)*. Fishery Bulletin, 103(4), pp. 635-647.

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The annual ovarian cycle, mode of maturation, age at maturity, and potential fecundity of female Rikuzen sole (Dexistes rikuzenius) from the North Pacific Ocean off the coast of Japan were studied by 1) histological examination of the gonads, 2) measurement and observation of the oocytes, and 3) by otolith aging. The results indicated that ovulation occurs from September to December and peaks between September and October. Vitellogenesis began again soon after the end of the current season. Maturity was divided into eight phases on the basis of oocyte developmental stages. Mature ovaries contained developing oocytes and postovulatory follicles but no recruiting oocytes, indicating that this species has group-synchronous ovaries and is a multiple spawner. Almost all females matured first at an age of 1+ year and spawned every year until at least age 8+ years. Potential fecundity increased exponentially with body length and the most fecund fish had 15 times as many oocytes as the least fecund fish. Potential fecundity and relative fecundity were both positively correlated with age from 1 to 6+ years, but were negatively correlated, probably because of senescence, in fish over 7 years. These results emphasize that the total productivity of a D. rikuzenius population depends not only on the biomass of females older than 1+ but also on the age structure of the population.

Item Type: Article
Title: Reproductive biology of female Rikuzen sole (Dexistes rikuzenius)*
Personal Creator/Author:
Narimatsu, Yoji
Kitagawa, Daiji
Hattori, Tsutomu
Onodera, Hirobumi
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 103
Number: 4
Page Range: pp. 635-647
Date: 2005
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Item ID: 9020
Depositing User: Patti M. Marraro
Date Deposited: 03 Aug 2012 15:13
Last Modified: 03 Aug 2012 15:13

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