Fry from each replicate of each treatment group remained in their
own 10-litre aquaria until they were approximately 5 mm in length
(about 6e8 weeks of age), after which each replicate was transferred
to its own 39-litre aquaria. Maturity was confirmed by the presence
of fertilized eggs found in breeding baskets in each aquarium after
individuals in each replicate were about 12 weeks old