双壳纲又称瓣鳃纲或斧足纲，是软体动物门各纲中种类较多和经济价值最大的一个纲。
不过，协定没有涉及到双壳贝类、水产品卫生和检疫问题。
However, it does not include trade of bivalves, fish health and quarantine issues.
变态过程是双壳贝类由幼虫向成体转变的一个必不缺少的发育阶段。
Metamorphosis is an important stage from larva to juvenile in bivalvia.
采用本发明可以于海区现场精确得浅水区潮间带双壳贝类的生物沉积作用。
The field measuring method and a field measuring method can accurately obtain the deposition action of bivalve living creatures in shallow water area intertidal zone in a sea area field.
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