摘要
对圆背角无齿蚌的钩介幼虫寄生变态及稚贝发育过程进行了形态学观察和比较。实验表明:在水温(19.0±1.0)℃时,钩介幼虫需要约13天的寄生变态才能从鱼体脱落。圆背角无齿蚌在变态发育过程中其外部形态、内部器官、营养源发生了较大变化:成熟的钩介幼虫仅仅可以作简单的双壳开合运动;刚脱落的稚贝外部形态与幼虫相似,但已经可以依靠斧足进行爬行,并逐渐开始滤食;稚贝经过一段时间的生长,从幼虫壳内侧长出一对新壳,形态逐渐趋向于成贝,而幼虫壳则逐渐退化为壳顶。因此,圆背角无齿蚌的变态发育包括两个明显的阶段:第一阶段为寄生变态期;第二阶段为贝壳分泌期。
Morphologies of glochidium and juvenile mussel were studied during parasitic metamorphosis development of Anodonta woodiana pacifica. The observation indicated that the parasitic period was approximately 13 days at mean water temperature between 18 ℃ and 20 ℃. During metamorphosis development, A. wp would change greatly in the external form, internal tissues and nutrient source. Mature glochidium was only capable of switching by shells, while the newly metamorphosed juveniles were near identical to glochidium in size and shape except for the ability of movement by foot. After a period of growth, newly shells which were similar to adults came out near side of glochidium shells, which were degenerating as shell bottom gradually. Accordingly, metamorphosis development of A. wp includes two identical phases： the first is parasitic metamorphosis phase; the second is shell exudation phase.
出处
《上海水产大学学报》
CSCD
北大核心
2006年第2期252-255,共4页
Journal of Shanghai Fisheries University
基金
国家科技部基础性研究
江苏省科技公关项目资助(BE2003359)
关键词
圆背角无齿蚌
寄生变态
钩介幼虫
稚贝
Anodonta woodiana pacifica
parasitic metamorphosis
glochidium
juvenile mussel
