## 4 Discussion
### Comparisons of LC\({}_{50}\) Values with Those of Other Species of Molluscs
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Molluscs** & **Species** & **Water Hardness** & **Live** & **Test** & **LC\({}_{\text{50}}\)** & **References** \\  & **(mg/L)** & **Stage** & **Duration** & **(mg/L)** & **References** \\ \hline Bivalves & _Corbicula fluminaa_ & 64 & NA & 96-h EC\({}_{\text{50}}\) & 6.04 & [PERSON] et al. [104] \\ _Actinonais pectorosa_ & 170 & Glochidia & 96-h EC\({}_{\text{50}}\) & 0.31 & [PERSON] et al. [104] \\ _Medionidus corradicus_ & 170 & Glochidia & 96-h EC\({}_{\text{50}}\) & 0.57 & [PERSON] et al. [104] \\ _Phychobranchus_ & & 170 & Juveniles & 96-h EC\({}_{\text{50}}\) & 0.21 & [PERSON] et al. [104] \\ _fascolaris_ & 160 & Juveniles & 96-h EC\({}_{\text{50}}\) & 0.27 & [PERSON] and [PERSON] [97] \\ _Utterbacia imbecillis_ & 80 & Juveniles & 96-h EC\({}_{\text{50}}\) & 0.44 & [PERSON] and [PERSON] [97] \\ _Utterbacia imbecillis_ & 60 & Juveniles & 96-h EC\({}_{\text{50}}\) & 0.36 & [PERSON] and [PERSON] [97] \\ _Utterbacia imbecillis_ & 80 & Juveniles & 96-h EC\({}_{\text{50}}\) & 0.59 & [PERSON] and [PERSON] [97] \\ _Villosa nebulosa_ & 170 & Glochidia & 96-h EC\({}_{\text{50}}\) & 0.66 & [PERSON] et al. [104] \\ _Actinonais pectorosa_ & 40 & Juveniles & 96-h EC\({}_{\text{50}}\) & 0.36– & McCann [105] \\ _Actinonais pectorosa_ & 160 & Juveniles & 96-h EC\({}_{\text{50}}\) & 1.06– & McCann [105] \\ _Villosa iris_ & 50 & Juveniles & 96-h EC\({}_{\text{50}}\) & 0.34 & McCann [105] \\ _Villosa iris_ & 160 & Juveniles & 96-h EC\({}_{\text{50}}\) & 1.12 & McCann [105] \\ _Villosa umbrans_ & 43 & Juveniles & 96-h EC\({}_{\text{50}}\) & 1.30 & [PERSON] et al. [98] \\ _Villosa nebulosa_ & 43 & Juveniles & 96-h EC\({}_{\text{50}}\) & 0.44 & [PERSON] et al. [98] \\ _Donax faba_ & 29.9 ppt & Adult & 96-h EC\({}_{\text{50}}\) & 3.61 & Din and Ong [81] \\ _Anadara granosa_ & 29.5 ppt & Adult & 96-h EC\({}_{\text{50}}\) & 7.76 & Din and Ong [81] \\ _Modiolus phillipipinarum_ & NA & NA & 96-h EC\({}_{\text{50}}\) & 2.34 & [PERSON] et al. [82] \\ \hline Gastropods & _Helsoma campanulatum_ & 20 & Adult & 96-h EC\({}_{\text{50}}\) & 0.87– & [PERSON] [106] \\ _Helsioma campanulatum_ & 100 & Adult & 96-h EC\({}_{\text{50}}\) & 1.27– & [PERSON] [106] \\ _P. heterostropha_ & 20 & Adult & 96-h EC\({}_{\text{50}}\) & 1.11 & [PERSON] [106] \\ _P. heterostropha_ & 100 & Adult & 96-h EC\({}_{\text{50}}\) & 3.16 & [PERSON] [106] \\ _Physa heterostropha_ & 20 & Juveniles & 96-h EC\({}_{\text{50}}\) & 1.39– & [PERSON] [106] \\ _Physa heterostropha_ & 100 & Juveniles & 96-h EC\({}_{\text{50}}\) & 1.39– & [PERSON] [106] \\ _Aminicola sp._ & 50 & Adult & 96-h EC\({}_{\text{50}}\) & 14.0 & [PERSON] et al. [83] \\ _Aminicola sp._ & 50 & Embryo & 96-h EC\({}_{\text{50}}\) & 20.2 & [PERSON] et al. [83] \\ _Viviparus bengalensis_ & 180 & NA & 96-h EC\({}_{\text{50}}\) & 0.64 & [PERSON] et al. [69] \\ _Lymnaea luteola_ & NA & NA & 96-h EC\({}_{\text{50}}\) & 6.13 & [PERSON] et al. [92] \\ _L. acumitata_ & 375 & NA & 96-h EC\({}_{\text{50}}\) & 10.5 & [PERSON] et al. [99] \\ _Phyas gyrina_ & 36 & Adult & 96-h EC\({}_{\text{50}}\) & 1.27 & [PERSON] et al. [71] \\ _Lymnaea luteola_ & 195 & Adult & 96-h EC\({}_{\text{50}}\) & 11.0 & [PERSON] and [PERSON] [28] \\ _Lymnaea luteola_ & 195 & Adult & 48-h EC\({}_{\text{50}}\) & 3.80 & [PERSON] and [PERSON] [28] \\ _Lymnaea luteola_ & 195 & Adult & 72-h EC\({}_{\text{50}}\) & 3.80 & [PERSON] and [PERSON] [28] \\ _Lymnaea luteola_ & 195 & Adult & 96-h EC\({}_{\text{50}}\) & 1.68 & [PERSON] and [PERSON] [28] \\ _Lymnaea luteola_ & NA & NA & NA & 58.0 & [PERSON] and [PERSON] [8] \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Comparison of LC\({}_{\text{50}}\) values (mg/L) of Zn in _Pomaea insularum_ with other molluss reported in the literature.