This is a discussion on Susceptibility of Fry to Ich? within the Tropical Fish Diseases forums, part of the Freshwater Fish and Aquariums category; -->
Just a general question --- are fry more susceptible to Ich then fully grown fish? Or to displaying the white spots? I am treating ...
Just a general question --- are fry more susceptible to Ich then fully grown fish? Or to displaying the white spots? I am treating a tank for Ich now unfortunately - the 16 fully grown fish (Barbs/Rasboras/Oto Cats) display no spots although a few of the barbs "flash" from time to time. The Barbs had fry (yay!) and over the last two days 3 of the 5 fry have developed the white spots and have been "flashing". This just led me to wonder if Fry are more susceptible or it was just coincidence that it has only been my fry to display so far.
Just guessing, but if fish immune systems develop anything like humans, it takes a little time for their immune systems to ramp up after being born, so they may be more susceptible. It's just a guess however!
DKRST is on the right track, fry are more susceptible to any illness than a healthy adult fish will be, however, that also means they are more sensitive to medications, too. Most medications are too harsh for most fry that are very young and many people end up killing fry by treating them with meds rather than losing them to the actual illness.
I would suggest moving forward with caution and to avoid medications with fry whenever possible. In situations with ich, most healthy fish can fight it naturally without the use of medication, so its not surprising that you aren't seeing it on the adult fish.