Study on Gonadosomatic Index of Thai Native Apple Snail (Pila ampullacea Linneaus, 1758) in the Rice Fields of Srimuang-mai District, Ubon Ratchathani and Effect of Diet on the Growth of Juveniles

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Thanathip Lamkom
Dechnarong Phosri

Abstract

With climate change and environmental destruction, Thai native apple snail (Pila ampullacea Linneaus, 1758) population decreased drastically in wetlands and rice fields. Information on the distribution of Thai apple snail and its feeding types is deficient. For this study, Thai native snails were collected annually from the rice fields and prepared for spawning in tanks.  In July, wild females could spawn and egg clutches were moved and nursed with fresh lettuce (Lactuca sativa) for 1 month.  Feeding studies consisted of four experiments with four treatments, namely, the control (fresh lettuce), 15 % (ISP), 25 % (25P), and 40 % (40P) protein level in artificial pellet feed.  Different food types were given to 1 month old juveniles for 120 days. The findings revealed that total weight, body weight, shell length, shell width and gonadosomatic index (GSI) of wild snails differed significantly over time (P < 0.05). Total weight, shell length, and shell width of spawning female ranged from 10.4-20.2 g, 30.26-40.79 mm and 26.25-38.92 mm, respectively. The percentage of hatching success (70.09-96.05 %) had a negative relationship with total weight, shell length, and shell width. In the feeding experiments, total weight, shell length, and shell width of juveniles fed on 15 % protein level in diet were significantly different (P < 0.05). No mortality was found in all the experiments. It was concluded that artificial pellet feed at 15% protein level can potentially induce growth of snails in captivity.

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How to Cite
Lamkom, T., & Phosri, D. (2017). Study on Gonadosomatic Index of Thai Native Apple Snail (Pila ampullacea Linneaus, 1758) in the Rice Fields of Srimuang-mai District, Ubon Ratchathani and Effect of Diet on the Growth of Juveniles. Journal of Fisheries and Environment, 41(1), 27–36. Retrieved from https://li01.tci-thaijo.org/index.php/JFE/article/view/87791
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