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ISSN : 1225-3480

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Vol.26 No.3

Effect of Heating on the Sex Maturation and Egg Development of the Ark Shell, Scapharca Subcrenata

Jung, Choon-Koo
Oh, Bong-Se
Kim, Tae-Ik
Jin, Young-Guk
The Korean Journal of Malacology / The Korean Journal of Malacology, (P)1225-3480;
2010, v.26 no.3, pp.201-209
Jung,, C. , Oh,, B. , Kim,, T. , & Jin,, Y. (2010). Effect of Heating on the Sex Maturation and Egg Development of the Ark Shell, Scapharca Subcrenata. , 26(3), 201-209.

Abstract

The investigated of survival rate, sex ratio, condition index, gonad development frequency, gonad index, fertilization rate, hatching rate and time required development of D shape larvae of the ark shell, Scapharca subcrenata. Survival rate was lower in heating group compared with control group (P < 0.05). Sex ratio (female:male) observed 1:0.97 in control group, 1:0.62 in heating group. Condition index was significantly higher in heating group than control group (P < 0.05) and higher increased more than water temperature $17^{\circ}C$ of heating group. Gonad development observed slow in control group but more than ripe stage 80% in heating group (21-28 day, $20^{\circ}C$). Gonad index was higher in heating group compared with control group (P < 0.05). Fertilization rate and hatching rate of the ark shell was observed $82.17{\pm}3.55%$ and $63.57{\pm}2.36%$, respectively. The time required development of D shape larvae of the ark shell was observed 15 hour after fertilization. The suggested that results of the ark shell by heating were effective sex maturation and normal egg development.

keywords
Scapharca subcrenata, maturation, egg development, heating

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