Why is thiamine not found in carp?

Thiamine, or vitamin B1, is not typically found in carp due to their dietary habits and the types of food they consume. Carp primarily feed on detritus, plant matter, and smaller organisms that may not be rich in thiamine. Additionally, the presence of thiaminase, an enzyme that breaks down thiamine, in some of their natural food sources can further hinder thiamine availability. This combination of dietary factors and enzymatic activity contributes to the low levels of thiamine in carp.