Ucwaningo lwakamuva olwenziwe yi-Aquaculture Research Institute lukhombise imiphumela ethembisayo ngokusetshenziswa kwei-trichloroisocyanuric acid(TCCA) ekulimeni izimfanzi.I-TCCA iyikhemikhali esetshenziswa kakhulu yokubulala amagciwane kanye neyokwelapha amanzi, kodwa amandla ayo okusetshenziswa ekukhuliseni izilwane zasemanzini abengakahlolisiswa kahle kuze kube manje.
Lolu cwaningo, obeluxhaswe yiNational Science Foundation, kuhloswe ngalo ukuphenya imiphumela ye-TCCA ekukhuleni nempilo yezimfanzi ezimhlophe zasePacific (i-Litopenaeus vannamei) ohlelweni lwe-aquaculture olujikelezayo.Abacwaningi bahlole ukugxila okuhlukene kwe-TCCA emanzini, kusukela ku-0 kuye ku-5 ppm, futhi baqapha izimfanzi isikhathi esingamasonto ayisithupha.
Imiphumela yabonisa ukuthi izimfanzi emathangini aphethwe yi-TCCA zinezinga eliphezulu kakhulu lokusinda kanye namazinga okukhula kunalawo aseqenjini elilawulayo.Ukuhlushwa okuphezulu kakhulu kwe-TCCA (5 ppm) kukhiqize imiphumela engcono kakhulu, ngezinga lokusinda lika-93% nesisindo sokugcina samagremu angu-7.8, uma kuqhathaniswa nezinga lokusinda lika-73% kanye nesisindo sokugcina samagremu angu-5.6 eqenjini lokulawula.
Ngaphezu kwemiphumela yayo emihle ekukhuleni nasekusindeni kwezimfanzi, i-TCCA iphinde yabonakala iphumelela ekulawuleni ukukhula kwamagciwane ayingozi nezimuncagazi emanzini.Lokhu kubalulekile ekufuyweni kwezimfanzi, njengoba la magciwane angabangela izifo ezingacekela phansi inqwaba yezimfanzi.
Ukusetshenziswa kweI-TCCAe-aquaculture ayikho ngaphandle kwempikiswano, nokho.Amanye amaqembu ezemvelo azwakalise ukukhathazeka mayelana namandla okuthi i-TCCA idale imikhiqizo eyingozi uma ihlangana nezinto eziphilayo emanzini.Abacwaningi abaqhuba ucwaningo bayakuvuma lokhu kukhathazeka, kodwa baveza ukuthi imiphumela yabo iphakamisa ukuthi i-TCCA ingasetshenziswa ngokuphepha nangempumelelo ekulimeni kwezilwane zasemanzini ezindaweni ezifanele.
Isinyathelo esilandelayo sabacwaningi ukwenza olunye ucwaningo ukuze baphenye imiphumela yesikhathi eside ye-TCCA ekukhuleni kwezimfanzi, impilo, kanye nemvelo.Bathemba ukuthi lokho abakutholile kuzosiza ekusunguleni i-TCCA njengethuluzi elibalulekile labalimi bezimfanzi emhlabeni wonke, ikakhulukazi ezifundeni lapho izifo nezinye izici zemvelo zibeka engcupheni enkulu kubantu bezimfanzi.
Sekukonke, lolu cwaningo lumele igxathu elibalulekile eliya phambili ekusetshenzisweni kwe-TCCA kwezasemanzini.Ngokubonisa amandla ayo okuthuthukisa ukukhula nokusinda kwezimfanzi, kuyilapho futhi elawula amagciwane ayingozi, abacwaningi baye babonisa ukuthi i-TCCA inendima ebalulekile okufanele idlale esikhathini esizayo sokulima izimfanzi esimeme.
Isikhathi sokuthumela: Apr-28-2023