Frozen fish include:

Lake whitefish:   boneless, skin-on fillets

Lake trout:  boneless fillets or steaks

Chinook salmon (King salmon):   boneless, skin-on fillets or steaks

Walleye:  boneless,  skin-on fillets  

Yellow perch:  boneless. skin-on fillets 

Lake herring (Cisco):  boneless, skin-on fillets

Rainbow smelt:  head off - gutted