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and The small fresh-water shrimp Neocaridina denticulata (de Haan), an inhabitant of rivers, is known to migrate. To study its migration, marking with two kinds of vital stains, trypan blue and trypan red, was carried out by Costello (1964) and Niwa (1994). Both stains accumulated in the gills after injection, ap- pearing as marked chevron-shaped patterns beneath the branchiostegite. This marking does not subsequently fade. In spite of the strong toxicity of the pigment to crustaceans, the shrimp can survive 50 times the amount given to the crayfish Procambarus clarkii (Girard) (see Ueno, in preparation). The ex- istence of nephrocytes in the gill is well known from earlier investigations (Cuenot, 1895; Hewitt, 1907; Drach, 1930; Vogt, 1931; Balss, 1944; reviewed by Johnson, 1987), and the relationship between vital stains and nephrocytes was discussed by Drach (1930), who used trypan blue. Vogt (1931) used many different stains to identify the nephrocyte. In addition to trypan red, carmine and indigo- carmine were also used, but he obtained best results with trypan blue. The studies by Cuenot, Drach, and Vogt showed that nephro- cytes are found in decapods and mysids. All these observations were made by light mi- croscopy, however, and
Journal of Crustacean Biology – Brill
Published: Jan 1, 1998
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