ZHOU Shengjie, YANG Rui, YU Gang, LIU Yunteng, MA Zhenhua. Description of Euthynnus affinis vertebrae and appendages[J]. South China Fisheries Science, 2022, 18(1): 84-89. DOI: 10.12131/20200175
Citation: ZHOU Shengjie, YANG Rui, YU Gang, LIU Yunteng, MA Zhenhua. Description of Euthynnus affinis vertebrae and appendages[J]. South China Fisheries Science, 2022, 18(1): 84-89. DOI: 10.12131/20200175

Description of Euthynnus affinis vertebrae and appendages

  • In order to reveal the bone morphology of Euthynnus affinis, we studied its X-ray photography. The fish consisted of 20 trunk vertebrae and 18 tail vertebrae. The 4th–30th vertebrae connected with 27 spinal spines. The 16th–28th vertebrae extended downward and connected to each other to form a special bone structure. The upper and lower sides of the 35th–37th vertebrae extended obliquely to the rear to form three supraccaudal bones and three lower tail bones. The back half of the 38th vertebra evolved into a whole tailbone. The shoulder girdle was located at the 5th–6th vertebrae. The girdle bone was located below the 6th spine. The 1st dorsal fin was located above the 6th–16th vertebrae. The 2nd dorsal fin was located above the 21st–24th vertebrae. The anal fin was located below the 23rd–26th vertebrae. There were 7–8 small fins behind the dorsal fin, and the branch fin bone extended between the two spinal spines. There were 6–7 small fins behind the anal fin, and the fin bones extended between the two spines.The results show that the X-ray method can observe the bones of E. affinis clearly, but the head bones are not clear because of more overlapping; the X-ray method can achieve harmless fish bone research; in order to adapt to high-speed swimming in the sea, E. affinis has a unique bone structure. The study of bones of E. affinis enriches the research of tuna in the South China Sea, providing references for its classification and evolution, as well as providing ideas for the harmless study of rare fish.
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