THE SEA OF OKHOTSK COMMERCIAL FISH HELMINTHS AFFECTING HUMAN HEALTH AND THE QUALITY OF FISH PRODUCTS

Abstract

The purpose of the study is to determine the epidemiological significance of commercial fish in the Northern Priokhotye within the boundaries of the Magadan Region. Objectives: to study the species composition of pathogens of helminth-zooanthroponoses and helminths that affect the quality of fish products; the degree of invasion of fish (extensiveness of invasion – EI, intensity of invasion – AI) and development dynamics for monitoring and developing a plan for veterinary and sanitary examination of veterinary service institutions. During the period from 1989 to 2022, 6654 individuals of 11 species of commercial fish were studied using the method of incomplete helminthological dissection: pink salmon (Oncorhynchus gorbuscha), chum salmon (Oncorhynchus keta), coho salmon (Oncorhynchus kisutch), herring (Clupea pallasii), catfish smelt (Osmerus mordax dentex), smallmouth smelt (Hypomesus olidus), halibut (Hippoglossus hippoglossus stenolepis), blue halibut ( Reinhardtius hippoglossoides matsuurae), navaga (Eleginus gracilis), spiny flounder (Acanthopsetta nadeshnyi), pollock (Theragra chalcogramma). 6 types of helminths of epidemiological significance were identified: Anisakis simplex, Pseudoterranova decipiens, Diphyllobothrium luxi, Diphyllobothrium dendriticum, Diphyllobothrium sobolevi, Corynosoma strumosum and 2 types of helminths not dangerous to human health: Pyramicocephalus phocarum, Nybelinia surminicola. The infestation of Anisakis simplex and Pseudoterranova decipiens for all years of fishing reaches high values: for chum salmon 100.0 %, coho salmon 98.9 %, pink salmon 71.3 %, Pacific herring 91.2 %, halibut 67.4 %. Navaga is infected with Pyramicocephalus phocarum: EI – 55.2 %, AI on average 6.6 with localization in the body cavity and on internal organs without capsules. Catfish smelt is infested with Diphyllobothrium sobolevi by 61.8 %, AI on average 4.5; localization in the body cavity and on internal organs in an encapsulated state. The greatest epidemiological significance is observed in chum salmon, pink salmon, coho salmon, spiny flounder, catfish smelt and smallmouth smelt, since the helminths of zooanthroponoses: Anisakis simplex, Pseudoterranova decipiens, Diphyllobothrium luxi, Diphyllobothrium dendriticum were located in the thickness of the muscles of the studied fish species.