There are two types of oily fish (containing wax in the body, not suitable for digestion, often pretending to be silver cod). The scientific names are:

Gempylidae, rose-banded fish (Gempylidae) (Gempylidae) ) Ruvettus fish

The picture below shows the rose-banded snake mackerel (Spiny-scaled snake mackerel) Ruvettus pretiosus, commonly known as oil fish and black-skinned bull

The spine-scaled snake mackerel is long and slightly flattened. The dorsoventrally is curved, the mouth and eyes are smaller than those of other fish in the same family, and it has a lower and ribbed first dorsal fin. In addition, the pupils can emit bright phosphorescence, the fish body is smooth and dark brown in color, the scales are small and needle-shaped, and each row has a row of alternating small stomata. The fish meat is yellow-white in color and has a texture similar to poultry meat. Spiny scale snake mackerel contains wax ester, a component similar to wax oil that the human body cannot absorb

There is a lot of oil, and eating too much can easily cause diarrhea. Therefore, the consumption of this fish is regulated in many areas of the world, and its import and sale are even prohibited in Japan and Italy. Commonly found in tropical and temperate oceans around the world.

Lepidocybium fish in the same family as Lepidocybium flavobrunneum

The picture below shows Lepidocybium flavobrunneum, commonly known as oil fish , Jade Barracuda, White Jade Dolphin

The appearance is similar to the spiny-scale snake mackerel, but the scales are larger, there is a ridge in the center of the tail peduncle, the lateral lines are large curved lines, and the fins are also slightly different. The snake mackerel has a shiny body with a dark brown color that gradually turns black as it grows. The dorsal fin has 8 to 9 hard spines; the dorsal fin has 16 to 18 soft rays; the anal fin has 1 to 2 hard spines; and the anal fin has 12 to 14 soft rays.