Are fry and young fish more sensitive to salt than adults?
Yes, lab studies have shown that fry are not as tolerant to salt as larger fish. Rothen et al. (2002) studied the effects of salt on the fry of Blue gouramis, Zebra danios, Black widow tetras and Buenos Aires tetras. All fry tolerated up to 1ppt, and doses as high as 3ppt had little effect on Blue gourami fry. The tetras and danios were OK at 1ppt, but started to suffer at higher dosages. Exercise caution.
