A recent paper from the Hocking Lab describes a simple method for obtaining electroretinogram measurements from zebrafish. Excitingly, it works for larval, juvenile and adult fish. Well done Nate Nadolski on your success following painstaking work to develop the new procedure.
Nadolski NJ, Wong CXL, Hocking JC. Electroretinogram analysis of zebrafish retinal function across development. Doc Ophthalmol. 2020. doi:10.1007/s10633-020-09783-y