In conclusion, incubation of internal organs for recovery of nematode larvae, as proposed in the present study, is a simple and efficient method that can be easily employed in all laboratories and is strongly recommended following visual examination of fish. Observation by eye is a poor method for detecting worms, not only because small anisakid or raphidascarid larvae may be easily missed, but also due to many of them being embedded deeply in tissues of internal organs. Reports of the absence of anisakid larvae in fish, particularly inwild fish, or farmed fish cultured in open systems is doubtful unless a combined method has been used. We suggest that results, conclusions or recommendations
made in studies that claim no anisakids/ascaridoids larvae were found in a fish should be approached carefully if it is based only on visual examination of the fish.