Abstract:

The concentration of formaldehyde in 1013 fishery product samples, which including 314 samples of 12 species of freshwater fishes, 356 samples of 19 species of marine fishes, 147 samples of 9 species of crustaceans, 137 samples of 5 species of shellfish and 59 samples of 4 species of cephalopods, were determined by acetylacetone spectrophotometric method. The results showed that the median of formaldehyde content in fresh fishery products is 0.25 mg/kg, which was far below the average concerntration (6.31 mg/kg), indicating that most samples have low formaldehyde contentration. In the survey of 49 species, bombay duck（Hacpodon neheceus）, cod（Cadous macrocephalus, Theragra chalcogramma and Miciomesistius poutassou）, squid (Loligo chinensis), squill (Oratosquilla) and swimming crab (Portunus trituberculatus and Portunus pelagicus) had higher levels of formaldehyde in the background. While formaldehyde content in tilapia seemed to be significantly higher than other freshwater fish species (p<0.05). Significant differences on types showed that the formaldehyde conerntration in marine fish samples were great, followed by samples of cephalopods, crustaceans and shellfish, however, samples of freshwater fish was in the lowest formaldehyde content (p<0.05).