Velvet (Amyloodinium) infections in fish can easily be avoided.

“5. Conclusions

Our results indicate that infestations of […] the gill parasite A. ocellatum can be avoided if a defined pattern of water quality is kept within production ponds with a defined fish stocking level. This pattern of water quality can be achieved by water renewal with night tides, which should be carried out by considering the dissolved oxygen values in production ponds.”

What?

Velvet can be avoided. 
It is not inevitable. 
Even in a scenario where it’s commonplace.

How?

Stocking levels matter.
Water quality (not our definition*) matters.

This is something I (and others) have been stating for years — mostly against stiff opposition in social media forums.  (Folks who generally see infections as inevitable and chemical treatments as mandatory….which they are if you don’t know or heed this info.)

Hyperparasitism of trichodinid ciliates on monogenean gill flukes of two marine fish

Hyperparasitism of trichodinid ciliates on monogenean gill flukes of two marine fish A. Colorni*, A. Diamant Dis Aquat Org 65: 177–180, 2005, Published June 30 doi:10.3354/dao065177 Full PDF is (also) available on the Int-Res link above! Under perturbed environmental conditions, specificity between fish hosts and their parasitic fauna often breaks down (Rohde 1982, Thoney & […]

Book: Biology of Stress In Fish – Fish Physiology (Chapter 12 – Stress Management And Welfare)

Book: Biology of Stress In Fish – Fish Physiology (Chapter 12 – Stress Management And Welfare) Lynne U Sneddon, David C.C. Wolfenden, Jack S Thomson Biology of Stress in Fish – Fish Physiology, pp.463-539 The Chapter 12 authors have posted their work on Research Gate here: https://www.researchgate.net/publication/309613409_Stress_Management_and_Welfare DOI: 10.1016/B978-0-12-802728-8.00012-6 (Science Direct) There is not only a lack of […]