nurglespuss
Fish Gatherer
Hmmm this is an odd area really...
Yes, there is an hormonal effect, but it would be seriously small (in an aquarium sized environment) - the other stressors would have a mich greater effect...
BUT, there is evidence of slower growth (but no loss in eventual size) in some species of Cyprinid... but its a delay in growth (this can happen naturally in hundreds of species of animal - dependent on resources/territory etc. - a good mammal example is the bottlenose dolphin which grows larger out to see, but stays at a smaller size for longer near harbours).
Yes, there is an hormonal effect, but it would be seriously small (in an aquarium sized environment) - the other stressors would have a mich greater effect...
BUT, there is evidence of slower growth (but no loss in eventual size) in some species of Cyprinid... but its a delay in growth (this can happen naturally in hundreds of species of animal - dependent on resources/territory etc. - a good mammal example is the bottlenose dolphin which grows larger out to see, but stays at a smaller size for longer near harbours).