Abstract

Chub mackerel Scomber japonicus (Scombridae) is a pelagic species that inhibits warm and temperate coastal waters of the Atlantic, Indian and Pacific Oceans. The topological characteristics of the mouth cavity of the carnivorous fish S. japonicas was studied by using light microscope. The results revealed that all the teeth of S. japonicas are pointed and canine-like, papilliform teeth present on the premaxillae and the anterior regions of the dentaries are associated with seizing, grasping and holding of prey. The morphology and distribution of different taste buds of S. Japonicas were predominantly localized at tongue and the anterior regions of the mouth cavity. Two types of taste buds are elevated from the epithelium at different levels, which may be useful for ensuring full utilization of the gustatory ability of the fish, detection and analyzing of taste substances, as well as for assessing the quality and palatability of food, during its retention in the mouth cavity. Observations of the surface architecture of the mouth cavity of S. japonicas have been discussed within the context of feeding and habitat preferences, as well as ecomorphological adaptation of the species.