Survival of Tanner crabs tagged with Floy tags in the laboratory

Survival of Tanner crabs tagged with Floy tags in the laboratory

B.G. Stevens

Survival of Tanner crabs tagged with Floy tags in the laboratoryThis is part of Crabs in Cold Water Regions: Biology, Management, and Economics
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Description

Floy tags were tested for long-term tagging of Tanner crabs, Chionoecetes bairdi, in the laboratory. "T"-bar type tags with tapered shoulders were inserted to the epimeral line of 40 mature female Tanner crabs, and 39 control crabs were marked with leg bands. Crabs were maintained in the laboratory for 15 months. No Floy tags were lost, but mortality of tagged crabs was significantly higher than that of controls during the first 3 months. Tags often penetrated the hepatopancreas or ovary causing formation of a necrotic melanized knot around the tag base. Median survival time was 72 days for tagged crabs and 244 days for control crabs. Field programs of crab tagging should employ parallel controlled studies to determine appropriate rates of tag loss and induced mortality.

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