Investigation Of Regional Distribution And Countermeasures Of Major Marine Shellfish Toxins In Fujian Province

There are many kinds of algal toxins produced in red tide events including paralytic shellfish poisoning(PSP),diarrhetic shellfish poisoning(DSP),amnesic shellfish poisoning(ASP),neurotoxic shellfish poisoning(NSP)and ciguatera fish poisoning(CFP).Globally,PSP and DSP are the most harmful toxins,which cause lots of human poisoning and death events.At present,the occurrence of PSP and DSP in the coastal waters of Fujian is still lacking in continuous and systematic studies,which has affected the effective monitoring of the occurrence and distribution of shellfish toxins in the coastal waters of fujian.In this paper,from the spring of 2016 to the spring of 2017,17 varieties of shellfish,a total of 307 samples were collected from 11 areas in fujian coastal area,to carry out the comprehensive analysis and research on the distribution pattern of PSP and DSP,and thus to reveal the distribution characteristics of shellfish toxins depending on various season,area and variety.The research results could provide certain practical and theoretical significance for the progress of coastal economic shellfish breeding industry in fujian province,the food safety of shellfish seafood,and the establishment of scientific and reasonable shellfish toxin monitoring system.It can also provide theoretical reference for scientific decision-making of fishery,food and epidemic prevention.The main contents and results were as following:1.Among 307 collected shellfish samples,175 samples were found with DSP,among which 120 samples were over the standard,and the positive detection rate and the positive over-standard rate were 57% and39%,respectively.The species tested positive were Crassostrea,Sinonovacula constricta,Venerupis philippinarum,Patinopecten yessoensis,etc..The highest detection value of Crassostrea and Patinopecten yessoensis was as high as 0.8 MU/g,which significantly exceeded the alert value of 0.05 MU/g of DSP in China.The positive detection rate and over-standard rate of DSP show seasonal difference in shellfish samples;and the rates are highest in the north coastal areas of Fujian(Mindong areas),and lowest in the south coastal areas of Fujian(Minnan areas).2.Among 307 collected shellfish samples,PSP was detected out in15 samples mainly in spring,which means positive detection rate is 5%.The maximum value detected is 197 MU/100 g,which is lower than the present alarm value of 400 MU/100 g in China.It can be seen that the content of PSP in coastal fujian province is generally low,mainly occurring in spring.The spatial distribution of PSP in the coastal areas of fujian is relatively wide,which is detected in the waters of eastern fujian,central fujian and southern fujian.The positive detection rate of paralytic shellfish toxin in the shellfish samples extracted from southern fujian isthe highest,followed by eastern fujian and central fujian.Of the 17 shellfish species tested,Crassostrea and Venerupis philippinarum are more likely to accumulate PSP,while Sinonovacula constricta is the least likely to accumulate the toxin.3.Based on the seasonal,area and variety distribution characteristics of PSP and DSP in fujian province,this paper proposes the following countermeasures: further strengthening the implementation and supervision of the water quality standards of shellfish breeding waters and the market access standards of shellfish circulation;According to the pattern of shellfish toxin,the shellfish species in special season and sea area were monitored intensively;further strengthening standards for collecting and handling shellfish and ensure food safety.It provides valuable reference basis for the establishment of monitoring shellfish safety problems,early warning and emergency measures.