| Main Title |
Calibrated Mask-Bar for Underwater Measurement of Fish. |
| Author |
Swenson, W. A. ;
Gobin, W. P. ;
Simonson, T. D. ;
|
| CORP Author |
Wisconsin Univ.-Superior. Center for Lake Superior Environmental Studies.;Environmental Research Lab.-Duluth, MN. |
| Publisher |
c1988 |
| Year Published |
1988 |
| Report Number |
EPA-R-812215 ;EPA-R-810934; EPA/600/J-88/461; |
| Stock Number |
PB90-147836 |
| Additional Subjects |
Fishes ;
Measuring instruments ;
Underwater equipment ;
Calibrating ;
Diving suits ;
Breathing masks ;
Reprints ;
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB90-147836 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
5p |
| Abstract |
The paper describes a method for measuring fish under water by using a diving mask equipped with a calibrated mask-bar. The calibrated mask-bar consists of a plexiglass strip with calibration marks spaced 3.22 mm (1/8 in) apart, mounted to a diver's mask by aluminum straps. Relationships between calibration mark counts made by underwater observers and the length of objects were described by regression analysis. Measurements of stationary objects were accurate to within + or - 5%. Estimates of fish length under field conditions were generally accurate to within + or - 10%. Mean lengths calculated from multiple mask-bar measurements were consistent with those calculated from measurement of captured fish. (Copyright (c) by the American Fisheries Society 1988.) |
| Supplementary Notes |
Pub. in North American Jnl. of Fisheries Management, v8 p382-385 1988. Sponsored by Environmental Research Lab.-Duluth, MN. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Calibrated Mask-Bar for Underwater Measurement of Fish. |
| Category Codes |
98F; 48B; 47D; 95G |
| NTIS Prices |
PC A01/MF A01 |
| Primary Description |
600/03 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
007531432 |
| Origin |
NTIS |
| Type |
CAT |
