Reference |
West, W. Q. B. and Chew, K. K. 1968. Application of the Bergman-Jefferts tag on the spot shrimp, Pandalus platyceros Brandt. Proceedings of the National Shellfish Association 58:93-100. |
Abstract |
The Bergman-Jefferts ferromagnetic wire tag was used in two
50-day experiments on captive spot shrimp in saltwater aquaria. The tag was
inserted into the abdominal musculature at the first somite. Tagged, untagged and wounded shrimp were used in this study. The wounded shrimp were processed in the same manner as the tagged ones, including puncture by the needle, and differed only in the lack of tags. A high incidence of mortality was generally observed among the test animals, but no marked difference was found between mortalities of tagged, untagged and wounded shrimp. A mortality of shrimp occurred when the pH dropped below 6.6. The feeding habit and general activity of shrimp were considerably affected by low pH and newly shed shrimp appeared to be more adversely affected. The percentage of shrimp that molted at least once was relatively high, 61.5% in Experiment 1 and 72.5% in Experiment 2, but only 2.5% molted twice in both experiments and most of these were in the small size group (<20 mm carapace length). No difference in molting was observed between the tagged, untagged and wounded shrimp. No abnormalities that could be directly attributed to the implantations of the wire tags in the shrimp musculature were noted. Hence, the wire tag has great promise in identifying shrimp and other crustaceans for migration, growth and population studies. |
Tag |
Coded Wire Tag (CWT) |
Objective |
Evaluate tags |
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