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Little yellow croaker ( Larimichthys polyactis ) and big head croaker ( Collichthys lucidus ) are economically important fishes of the Lyusi fishing ground. The intestinal bacterial communities of  L. polyactis  and  C. lucidus  were examined using 16S rRNA high-throughput sequencing technology. The Shannon and Chao-1 indices of the small body length group were significantly larger than those of the large body length group, and the Simpson index was the opposite ( P  &lt; 0.05).  Pseudomonas  and  Photobacterium  of  L. polyactis  were significantly less abundant than those of  C. lucidus  ( P  &lt; 0.05), and  Clostridium sensu stricto  and  Acinetobacter  were significantly more abundant than those of  C. lucidus  ( P  &lt; 0.05). The abundance of  Pseudomonas  in  L. polyactis  increased significantly with increasing body length ( P  &lt; 0.05), and the abundances of  Psychrobacter  and  Acinetobacter  decreased significantly with increasing body length ( P  &lt; 0.05). The abundance of  Clostridium sensu stricto  in the large body length group was significantly increased compared with that in the small body length group ( P  &lt; 0.05). The abundance of  Vibrio  first increased significantly and then decreased significantly ( P  &lt; 0.05) with increasing body length. The abundances of  Pseudomonas  and  Photobacterium  of  C. lucidus  increased significantly with increasing body length ( P  &lt; 0.05). The abundance of  Psychrobacter  in the large body length group was significantly lower than that in the other groups ( P  &lt; 0.05).  Clostridium sensu stricto  was significantly more abundant in the small body length group than in the other groups ( P  &lt; 0.05).  Vibrio  was significantly more abundant in the small body length group than in the other groups ( P  &lt; 0.05). Studies have shown that the feeding range of  L. polyactis  is wider than that of  C. lucidus . Compared with  C. lucidus ,  L. polyactis  is less carnivorous and more herbivorous. The carnivorous habit of the two fish became more and more obvious with the increase of body length. The  Clostridium sensu stricto  related to herbivory of the two fishes may be related to the need to degrade indirectly ingested plants. The larval stages of the two fishes had a higher proportion of  Vibrio .

marine biology research

Study of the characteristics of intestinal bacteria of little yellow croaker ( Larimichthys polyactis ) and big head croaker ( Collichthys lucidus ) from the Lyusi fishing ground