Gamma and electron beam irradiation in seafood preservation effectively damages microbial DNA without significantly affecting inorganic elements. Minerals (such as calcium, phosphorus, iron, and iodine) are chemically indestructible by ionizing radiation, whereas vitamins (especially thiamine and vitamin A) and polyunsaturated fatty acids (PUFA) are susceptible to free radical oxidation.

Aflatoxins are highly toxic, carcinogenic mycotoxins synthesized by molds belonging to the genus Aspergillus, predominantly Aspergillus flavus and Aspergillus parasiticus, which grow on improperly stored smoked and dried fish in humid tropical conditions.

Glazing is the process of dipping frozen fish briefly into cold potable water ($1^\circ\text{C} - 4^\circ\text{C}$) or spraying it to form a continuous thin protective glaze of ice over the surface. This ice jacket acts as a sacrificial barrier that prevents freezer burn (desiccation) and surface lipid oxidation during frozen cold storage.

C-enamel ('Corn-enamel') is an oleoresinous lacquer formulated with finely dispersed zinc oxide ($\text{ZnO}$). When fish or other high-protein sulfur-bearing foods are retorted, liberated sulfur volatiles react with $\text{ZnO}$ to form harmless, white zinc sulfide ($\text{ZnS}$), successfully preventing the formation of unsightly black iron sulfide ($\text{FeS}$) staining on the tinplate.