CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Marine & Freshwater Research   
Marine & Freshwater Research
Journal Banner
  Advances in the Aquatic Sciences
blank image Search
blank image blank image
blank image
  Advanced Search

Journal Home
About the Journal
Editorial Board
Online Early
Current Issue
Just Accepted
All Issues
Special Issues
Research Fronts
Sample Issue
For Authors
General Information
Instructions to Authors
Submit Article
Open Access
For Referees
General Information
Review an Article
Referee Guidelines
Annual Referee Index
For Subscribers
Subscription Prices
Customer Service
Print Publication Dates

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with us
blank image
facebook twitter youtube


Article << Previous     |     Next >>   Contents Vol 30(6)

Natural Sex Inversion in the Giant Perch (Lates calcarifer)

R Moore

Australian Journal of Marine and Freshwater Research 30(6) 803 - 813
Published: 1979


A detailed examination of the sexuality of L. calcarifer led to the conclusion that it was a protandrous hermaphrodite. The smaller length classes are almost exclusively male, the percentage of females increasing with increased total length. Length frequencies, calculated from the dissection of 5202 mature specimens, give a male mode at 89.5 cm and a much smaller female one at 101.5 cm. The overall sex ratio is 3.8:1 in favour of males. There is a small proportion of primary females and also the possibility that some males do not undergo the change to female. Biopsy experiments were used to confirm protandric sex inversion.

As the gonads of L. calcarifer are strongly dimorphic, inversion of sex requires a complete reorganization of gonad structure as well as function. Few hermaphrodite gonads were detected, this being attributed to a rapid transition phase from male to female and the lack of sampling during the period when transitions are most likely to occur.

Full text doi:10.1071/MF9790803

© CSIRO 1979

blank image
Subscriber Login

PDF (685 KB) $25
 Export Citation
Legal & Privacy | Contact Us | Help


© CSIRO 1996-2015