Oxygen consumption and ammonia-N excretion rates of Coelomactra antiquata The genetic differentiation analysis on Coelomactra antiquata Zhangzhou populations based on nad5: taking that of two Mactra species as a reference Stock difference of Coelomactra antiquata based on nuclear (ITS2) and mitochondrial (16S rRNA) DNA sequence and secondary structure ITS1 sequences variation and phylogenetic analysis on five geographical stocks of Coelomactra antiquata