Reference |
Bordner, C. E., S. I. Doroshov, D. E. Hinton, R. E. Pipkin, R. B. Fridley, and F. Haw. 1990. Evaluation of marking techniques for juvenile and adult white sturgeons reared in captivity. American Fisheries Society Symposium 7:293-303. |
Abstract |
Hatchery-produced, 5-month-old, 39-g fingerlings of white sturgeon Acipenser transmontanus were marked by combinations of wire microtag implants and amputation of one of the four barbells. Six control and treatment groups were mixed and raised in tanks with artificial feeding for 6 months. Marking treatments did not affect fingerling survival (96-100%) or growth (3.0-3.6%d). All microtags were retained when implanted under the first dorsal scute or 4-5 mm deep in the snout cartilage. Shallow (2-3 mm) implantation in the snout resulted in 40% microtag loss. Amputated barbells did not regenerate, which allowed identification of fish after the 6-month rearing period. Radiographic and histological examinations of tagging sites indicated that there was very little disturbance of the tissue. Domestically raised white sturgeon brood stock, 3-6 years old, were marked by subcutaneous ink tattoos on the abdomen near the pelvic fins. Marks that identified the stock origin, sex, and individual identity were seen clearly after 1 year, and enabled us to make observations on growth rates of individual fish. These observations indicated that ripe males ceased growth during the winter season. |
Tag |
Coded Wire Tag (CWT) |
Objective |
Evaluate tags |
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