[KITKAT]

Each paragraph below is a quote from a different website. Put the information together, and you get the result that Sardines ***DO*** contain thiaminase, but herring do not. Some sardines sold for human consumption are actual sardines, while others are herring. Therefore, since labelling does not reveal which species of fish is in the package, I would advise garter keepers to avoid anything labelled sardine. However, if you are able to purchase Herring, labelled as such, it is one of the species that does NOT contain thiaminase.

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Six species of sardine are generally recognized: five in the Pacific and Indian Oceans (Sardinops species) and Sardinia pilchardus in the Atlantic and Mediterranean. In 1998 US researchers announced, following analysis of mitochondrial DNA from the Sardinops species, that they were in fact probably widely dispersed regional populations of the same species, rather than different species.

The sardine, or pilchard, is an ocean going fish well known for traveling in large groups, or schools. The sardine is related to the herring, and sometimes canned fish labeled as sardine is actually herring.

Some species of fish belonging to the sardine and anchovy families contain enzymes that degrade thiamin contained in the trash fish itself.