I have emailed the companies of the two brands I find at petco.

Ocean Nutrition and San Fransisco brand "Sally's Silversides" to find out the latin name of the fish they both sell. I keep hearing things like "Only pond smelt are safe" well, pond smelt are from the arctic. These fish they sell as silversides at petco are smelt. Plain and simple. Just like the ones that can be netted on the west coast U.S.A.. Now the debate is, do they contain thiaminase or not? Just like the goldfish I fed my garters for years with no issues, other people have been using these silversides or smelt, or whatever you want to call them, for years and have had no problems.

I hope they respond with an answer soon.