In this study, we determined the content of chitooligosaccharides (COS) in Korean commercial salt-fermented shrimps by competitive direct enzyme-linked immunosorbent assays (cdELISAs), using anti-COS mixture (COSM) antibody and COSM horseradish peroxidase (HRP) conjugate. When COS6 was spiked into salt-fermented shrimps at the level of $10-300mu{g/g,}$ the average recovery was $120pm19%$ ($meanpmS.D.$). The COS contents of the 92 samples of Korean commercial salt-fermented shrimps collected during February 2000 and August 2002 were $36.3pm20.7mug$ COS6 equivalent/g (expressed as "$mug/g$" hereafter). Among the samples, the COS contents of yuk-jeot ( $40.3 pm 22.5 mug/g, n=27$) and buksaewoojeot ($40.2 pm 21.6 mug/g, n=5$) were higher than the others. The COS contents of salt-fermented shrimps produced at Gwangcheon ($47.1 pm 20.7 mug/g, n=18$) and Gomso ($44.1 pm 21.8 mug/g, n=6$) areas were higher than those produced at the other areas. This is the first report to determine COS of salt-fermented shrimps by cdELISA.