The 2 I kept this year one had emeralds only and the other had emeralds and a crawfishabout 1" long in it .
I have caught pike ,bass(LMB,SMB) perch, steelhead and brown trout all out of Erie that have had emeralds,crawfish,gobies and smelt I think they will eat anything that will fit in their mouths even caught jumbo's with small 1-2" perch in their bellies.