Variation of total sugar content in the body of Cathaica fasciola before and after epiphragm-breaking
[Objective]To understand the variation characteristics of the total sugar content in the body of Cathaica fasciola be-fore and after epiphragm-breaking,and to provide information for further research on the biochemical mechanism of epiphragm-breaking.[Methods]The total sugar content in the feet and viscera in two weight groups of C.fasciola under dif-ferent conditions,including epiphragm-breaking,the duration of dormancy,feeding and starvation,were measured with the anthrone colorimetry.[Results]The total sugar content in the body of dormant snails increased after epiphragm-breaking,which was higher in the snail feet and viscera in weight group Ⅳ than that in weight group Ⅰ.There was a significant difference in the sugar content of snail feet between before and after epiphragm-breaking,while no significant difference was found in the viscera(P＜0.05).The total sugar content in dormant snails decreased with the increase of dormant duration,the differences between dormant durations were not significant except for the significant differences between the dormant durations of 1 d(27.62 μg/mg)and 5 d-15 d in the feet of weight group Ⅰ.After feeding,the variation of the total sugar content in the feet and viscera had basically similar tendency,which all increased after feeding for 12-24 h then decreased after feeding for more than 24 h Except for the feel in weight group Ⅳ,the total sugar content after feeding for 24 h was significantly higher than those for 12 h and 36 h.The total sugar content in the feet and viscera of active snails decreased with the increase of starvation duration,which was significantly lower after being starved for 24 h than 12 h.[Conclusion]The variation of total sugar content in the body of C.fasciola before and after epiphragm-breaking was affected by many factors,which reflected the physiological char-acteristics in epiphragm-breaking.
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