I am trying to bake frozen Costco cod fillets. The directions say to pre-heat the oven to 400 degrees, thaw the fillet, then bake for 10 to 12 minutes or until the internal temp. is 145 degrees. After 12 minutes the cod didn't seem to flake very well (not like my tilapia or salmon) and the internal temp. was only 115. It took about 10 more minutes to get the internal temp. up to 140 degrees (close enough) . . . At that point the cod fish was tough and leathery and chewy . . . over-cooked. Any insights you can give me here would be most appreciated . . . Maybe cod fish does not flake like tilapia or salmon . . . maybe an internal temp of 145 is unrealistic. Any thoughts would be appreciated.