sexing larval fish

[christian lawrence]

greetings.  does anyone out there have a quick and dirty method of 
determining the sex of individual zebrafish prior to full sexual 
maturation (by this i mean the point at which the sexual phenotype 
is readily apparent by virtue of coloration, morphology, and 
breeding ability/behavior). thanks, Christian Lawrence Zebrafish 
Facility The Biological Laboratories Harvard University 16 Divinity 
Street Cambridge, Massachusetts 02138 Tel: 617.496.8193 
clawrenc at fas.harvard.edu