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ISSN : 1225-3480

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Vol.28 No.4

Change of Survival and Reproductive Indicator of the Manila Clam, Ruditapes philippinarum Following Chronic Exposure to Naphthalene

Jin, Young Guk
Kim, Tae Ik
Myeong, Jeong In
Hwang, Hyung Kyu
Park, Min Woo
The Korean Journal of Malacology / The Korean Journal of Malacology, (P)1225-3480;
2012, v.28 no.4, pp.305-312
https://doi.org/10.9710/kjm.2012.28.4.305
Jin,, Y. G. , Kim,, T. I. , Myeong,, J. I. , Hwang,, H. K. , & Park,, M. W. (2012). Change of Survival and Reproductive Indicator of the Manila Clam, Ruditapes philippinarum Following Chronic Exposure to Naphthalene. , 28(4), 305-312, https://doi.org/10.9710/kjm.2012.28.4.305

Abstract

Manila clam, Ruditapes philippinarum (SL; $32.74{\pm}2.18mm$, TW; $8.29{\pm}1.41g$, N; 450) were exposed to various concentrations of naphthalene for 20 weeks. Exposure concentrations of naphthalene established control, solvent control (ethanol), 30, 60, 90 and $120{\mu}g$ Nap $L^{-1}$ following results of 96h acute exposure. After exposure during 20 weeks, survival rate of the manila clam was lowed in 60, 90 and $120{\mu}g$ Nap $L^{-1}$ exposure group compared control group. Also, sex ratio of male was higher in $60{\mu}g$ Nap $L^{-1}$ exposure group (${\chi}^2=5.492$, P < 0.05) but lowed $90{\mu}g$ Nap $L^{-1}$ exposure group (${\chi}^2=4.214$, P < 0.05) and $120{\mu}g$ Nap $L^{-1}$ exposure group (${\chi}^2=30.118$, P < 0.05). Gonad development was delayed in female (> $60{\mu}g$ Nap $L^{-1}$) and male (> $30{\mu}g$ Nap $L^{-1}$). Intersex was 16.28% in female, 1.68% in male. In this result, naphthalene caused survival decrease, imbalance of sex ratio, delay of gonad development of the manila clam. Also, chronic exposure to naphthalene suggested abnormal effects in reproduction of the manila clam.

keywords
Manila clam, naphthalene, survival, reproductive indicator

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