| Summary: | The present investigation was undertaken with the object of determining the food and feeding habits of the commoner gadoids in Manx waters. The work was carried out between October 1956 and August 1958 A total of thirteen gadoid--species were studied and four of these - cod, whiting, coaltish and pollack - were investigated in some detail. In the course of the work knowledge was gained on other aspects of the biology of most of the species, including their habits, abundance and seasonal movements. The effect of these biological aspects on the food and feeding habits of the particular gadoid was noted, While investigating the pelagic postlarval phase of some of the gadoids, whiting with a length-range of 21 to 53 mm were taken in some nubers associated with large scyphomedusae(Rhizostoma octopus L.). Whiting of these sizes have rarely been taken before and little was known of their bionomics. In this work, their food was found to be 'modified as a result of the association with the acyphomedusae; other characteristics of this interesting association are briefly presented.
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