A study was made on the distribution and seasonal variation in biomass and density, the characteristics in growth and death, and the behaviors in feeding and reporduction of Clu-panodon punctatus in the waters of Dongshan Island, Fujian Province. it was found to have a monthly mean biomass of 222. 21 kg/km2, representing 27. 22% of the monthly total biomass of necton in that area and making it become a dominant species. its biomass and density were found to be lowest in spring but highest in winter(524. 9 k...