Objective To develop a colloidal gold strip for rapid detection of allergen in freshwater crayfish. Methods Colloidal gold marked with monoclonal antibody and polyclonal antibody against tropomyosin of red swamp crayfish and goat anti-mouse IgG were sprayed onto the nitrocellulose membrane as detection line and control line. Sample pad,gold jet-pad,nitrocellulose membrane and absorbent paper were assembled and cut into test strips respectively. Results The specificity results showed that only sample of fres...