I use it for pike and they really loves it
Lukumbuzya M, Schmid M, Pjevac P, Daims H (2019) A multicolor fluorescence in situ hybridization approach using an extended set of fluorophores to visualize microorganisms
For new lures, our R&D team creates 3D drawings and prototypes from descriptions, drafts, or samples
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And then we can pick that up
But, not many fish are spawning mid-summer so eggs may not be your best choice then, however, they are still worth a try, and I do find that in mid-summer, going small like a 6mm or 8mm trout bead often works better than a big spawn sack will