Abstract
ABSTRACT Size-mass relationships were estimated for 4 species belonging to genus Semisulcospira from the Guem River, Korea. These 4 freshwater snail species: Semisulcospira libertina , Semisulcospira coreana , Semisulcospira gottschei , and Semisulcospira forticosta . Between June and November 2011, samples were caught by dredge (mesh size 10mm of multifilament nylon, total length 4.35 m) at depths of < 2 m. Estimates of for parameter b of the size-mass relationship ( W = aSH b ) ranged between 2.0072 ( Semisulcospira libertina ) and 2.3463 ( Semisulcospira gottschei ). Key words: Size-mass relationships, freshwater snail, Guem River Introduction The freshwater snail genus Semisulcospira is widely distributed in river, streams, and lakes (Davis, 1969). They have long been used as a healthy food source and provide an economically valuable fishery resource in Korea (Kim et al ., 2011; Lee et al ., 2005).Currently, wild populations of this species are declining due to over exploitation as well as environmental deterioration caused by sewage, pesticides, and the restructuring of riverbeds (Kim
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