Studies on the marking of commercial shrimp with biological stains.
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To determine the effectiveness of biological stains as marking agents for commercial shrimp Penaeus setiferus, Penaeus aztecus, and Penaeus duorarum, experiments were conducted on captive shrimp held in storage tanks and aquariums supplied with circulating sea water. Some 26 stains were tested by immersion, injection, and feeding. Staining by immersion proved consistently unsuccessful Distinctive and fast abnormal coloration has been induced by injection with Fast Green FCF (National Anilin), Niagara Sky Blue 6B, Trypan Blue, and Trypan Red. Feeding with mullet (Mugil cephalus) previously stained with Trypan Red also results in abnormal coloration suitable for identification. The feeding technique constitutes a satisfactory method for marking shrimp under 80 mm. in length. Whether these stains will prove equally fast under natural conditions must be determined by field experiments.