NDLI: Sex ratios of nigorobuna Carassius auratus grandoculis reared in paddy fields with fluctuating temperatures during larval and juvenile growth stages

Content Provider	Springer Nature Link
Author	Fujioka, Yasuhiro Nemoto, Morihito Kikko, Takeshi Isoda, Takane
Copyright Year	2014
Abstract	The sex ratios of the nigorobuna Carassius auratus grandoculis reared in paddy fields during the sex differentiation periods of larval and juvenile stages were examined, since the phenotypic expression of sex in the fish is thermolabile, so that sex determination is under the control of genetic factors and temperature. After 2 days from hatching, the larvae were introduced into five paddy fields at five different densities in late May. After 37 or 41 days from hatching the juveniles were collected when the water was drained from the paddy fields, and reared in laboratory tanks supplied with running freshwater pumped from the lake shore until the age of 144–164 days. The mean water temperatures in the paddy fields were 22.4–24.1 ºC, and the maximum water temperature during the day frequently exceeded 30 ºC during the supposed critical period of sex determination of the fish. The sex ratios in the five paddy fields did not show a male-bias. Instead, all fields produced either balanced or slightly female-bias sex ratios. These results suggest that temporary high and fluctuating temperatures in paddy fields with low mean temperatures have hardly any masculinization effects on genotypic females of C. auratus grandoculis during sex differentiation stages.
Starting Page	985
Ending Page	991
Page Count	7
File Format	PDF
ISSN	09199268
Journal	Fisheries Science
Volume Number	80
Issue Number	5
e-ISSN	14442906
Language	English
Publisher	Springer Japan
Publisher Date	2014-08-03
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carassius auratus grandoculis Fluctuating temperature Nigorobuna Paddy field Sex ratio Sex determination Fish & Wildlife Biology & Management Freshwater & Marine Ecology Food Science
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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