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The study on the spread of visible nematode larvae in frozen and fresh ocean and sea fish, marked in Bulgaria, has been conducted during the period 2017-2020. A total of 222 whole fish with head and offal (132 – frozen and 90 – fresh) were collected. The analyses were performed in accordance with Regulation (EC) 2074/2005. Presence of visible nematode larvae with sizes from 3 to 11 mm was found mainly on the walls of the abdominal cavity and the black membrane (94 %) and less frequently on the genitals (3 %). In the frozen fish was found only dead nematode larvae, but in the fresh fishes – alive. The prevalence of nematodes reaches to 100 % and the intensity of invasion varied from 1 to 25 larvae in the mackerel. In the case of fresh sprat, the extension invasion was in the range of 13 to 100 % and the intension invasion from 1 to 58 larvae. In the sample from hake, the prevalence of nematode larvae was 40-100 % and the intensity of the invasion – from 1 to 16 larvae. 50 % of the horse mackerel was infected with 1 to 6 parasites. The highest degree of intensity was found in fresh sprat, where the number of nematode larvae reaches 58. The health standards for fishery products, introduced by Regulation (EC) No 853/2004 do not allow infected fish with visible parasites to be marketed in the Community. The presence of live nematodes in fish creates a potential health risk to public health.
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