CATCH HANDLING AND THE POSSIBLE MIGRATION OF ANISAKIS LARVAE IN HERRING, CLUPEA-HARENGUS

The behavior of larvae of Anisakis sp. in North Sea herring (Clupea ha rengus) after capture was examined by a sensitive quantitative method (digestion). In one winter and one summer experiment, the mean numbers of worms in freshly caught herring were 0.06 and 0.09 (in double fill ets), 0.19 and 0.24 (in double belly flaps), and 10.4 and 7.8 larvae ( in viscera), respectively. In each experiment herrings were stored ung utted for up to 5 1/2 d on ice (0-degrees-C), in refrigerated/chilled sea water (-1-0-degrees-C), or in warm sea water (10-degrees-C), but n o changes in the numbers of Anisakis larvae in the belly flaps and the fillets could be demonstrated. The present results show that Anisakis larvae are present in the flesh of herring already at capture, but no significant postmortem migration into the flesh could be demonstrated during storage. Thus, immediately gutting on board cannot eliminate o r even reduce the risk from eating raw or inadequately processed herri ng.