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Relative Growth of the Melanin Snail, Semisulcospira libertina libertina and Monthly Composition of Larval Stages in its Brood Pouch
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 Title & Authors
Relative Growth of the Melanin Snail, Semisulcospira libertina libertina and Monthly Composition of Larval Stages in its Brood Pouch
CHANG Young Jin; CHANG Hae Jin; KIM Jae Jun;
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 Abstract
Relative growth and composition of larval development stages in brood pouch of the melania snail, Semisulcospira libertina libertina were investigated based on monthly field samples for a year. Total number of specimens examined was 1,200. Size values (meanS. D.) of shell height (SH), shell diameter (SD), total weight (TW), meat weight (MW) and shell weight (SW) were , , , and , respectively, Water temperature (WT) of the sampling site varied from . Relative growth equations among SH, SD, TW, MW and SW of S. libertina libertina specimens pooled were as follows: SD=0,3583SH+2.1648 , , and . Female S. libertina libertina had larvae in its brood pouch throughout the year, Average number of larvae in the brood pouch varied from to , decreasing in spring and increasing in autumn. In the monthly composition of larval stage in the brood pouch, trochophore, pre-veliger, veliger and juvenile showed maximum as in May, in November, in February and in January, respectively. Percent composition of the juveniles decreased in spring and autumn. In conclusion, S. libertina libertina is likely to have two main parturition periods, March to May and September and October.
 Keywords
Semisulcospira libertina liberina;Relative growth;Brood pouch;Larval composition;
 Language
Korean
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