Spikes are the larvae of the Bluebottle Fly. They also are an excellent bait for panfish, walleye and trout. They are underrated as a summer bait and often can be the most effective bait in your arsenal, especially during light bites. They ship well in the summer months despite their reputation of being intolerant of warm temperatures. HOLD IN THE DOUBLE 'ZIP LOCK' TYPE BAGS at 33 to 40 degrees for best results. Again, use a small container to take only what you will use for the day. Constant swings in temperature can contribute to early pupation, a reddish brown shell. Cold temperatures plus restricted air produce best results. Do not give Spikes the unlimited air supply that you would Wax worms.  This is the reason for the 'zip lock' type bags, to control air supply.