The TECO Perch Vitellogenin ELISA is the only commercially available ELISA for Perch/Perciformes. At the moment, there is not enough demand for an ultra-sensitive protocol. One option using the current protocol is to lower the dilution factor from 1:10 (50μL sample + 450μL extraction buffer) to 1:6 (50μL sample + 250μL extraction buffer). In development, this has been shown to increase the sensitivity of the assay appropriately.