宁波市有毒织纹螺地域分布分析

目的了解宁波市有毒织纹螺的分布。分析各栖息地有毒织纹螺的毒性变化，为控制织纹螺中毒提供依据。方法采用美国分析化学家学会（AOAC）和中国进出口检验检疫（CIQ）的小鼠生物测试法，以美国食品药物管理局（FDA）的贝类麻痹性毒素（PSP）标准，判定本地织纹螺毒性的强弱，按年观察结果。结果1986～2003年，宁波市127份被检织纹螺中毒素平均含量最高的年份为1991年，达11900MU／100g螺肉，最低年份为1988年，其毒素含量也达403MU／100gN肉，其他年份的毒性波动在一定范围内。不同栖息地毒螺检出率镇海区为31．43％，北仑区为39．29％，宁海县为73．08％，奉化市为25．00％，经统计学处理差异有统计学意义（P〈0．01）；除宁海外，其余3个县（市、区）毒螺检出率差异无统计学意义（P〉0．05）。从新增织纹螺栖息地象山采集的30份织纹螺样品，毒素测定值均≤400MU／100g肉，未检出毒螺。结论宁波市各栖息地的织纹螺带毒严重，是一种引起织纹螺中毒的原因食物。各栖息地织纹螺毒性存在差异，以宁海县的织纹螺带毒最普遍。毒螺的分布和毒性的强弱与地域相关。织纹螺毒素的毒性可消长，但无规律性。

Investigation on region distribution of poisonous nassarius Sp in Ningbo city

Objective To investigate the region distribution of poisonous Nassarious sp and study the difference in the paralytic shellfish poisoning(PSP) toxins in various habitats for the control of poisoning caused by poisonous Nassarious sp.Methods Results were achieved annually with the Association of Official Analytical Chemists(AOAC) and CIQ mouse bioassay in which the toxin intensity was determined according to the standard for shellfish paralytic toxins from FDA in USA.Results Among the 127 samples measured in 18 years,the highest concentration of PSP toxins,11?900?MU in 100?g of tissue,was found in 1991 and the lowest in 1988 with a concentration of 403?MU in 100?g of tissue.Toxin concentration varied in a certain range in other years.The percentage of poisonous Nassarious sp detected was 31.43%,39.29%,73.08% and 25.00% in Zhenghai zone,Beilun zone,Ninghai county and Fenghua city,respectively,which was significantly different(P<0.01).While no significant difference existed among the investigated 3 regions excluding Ninghai county(P>0.05).The average concentration of PSP toxins from Nassarious sp in Xiangshan county,a new habitat,was below 400?MU/100?g tissue and no poisonous Nassarious sp was found there.Conclusion High concentration of PSP toxins was detected in Nassarious sp tissue in Ningbo city,which was a major cause of food poisoning.Difference in toxicology existed among Nassarious sp in various habitats while poisonous Nassarious sp was most commonly found in Ninghai county.There was relationship between the distribution and toxic intensity of poisonous Nassarious sp and its habitats.The toxic intensity fluctuated without regularity.