Performance Evaluations of a Developed Girth-Measurement Device
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Accession number;06A1017141
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| Title;Performance Evaluations of a Developed Girth-Measurement Device |
| Author;
YOKOTA KOSUKE
(Tokyo Univ. Marine Sci. And Technol., Tokyo, Jpn)
TOKAI TADASHI
(Tokyo Univ. Marine Sci. And Technol., Tokyo, Jpn)
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Journal Title;Fisheries Engineering
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Journal Code:F0449B
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ISSN:0916-7617
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VOL.43;NO.2;PAGE.161-166(2006)
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| Figure&Table&Reference;FIG.3, TBL.4, REF.20 |
| Pub. Country;Japan |
| Language;English |
| Abstract;A girth-measurement device was developed with non-stretchable measuring tape and acrylic plastic case to improve efficiency and precision in fish-girth measurement for fishing-gear selectivity study. We evaluated the efficiency and precision of the device by comparing time required and errors in girth measurement of rainbow trout (Oncorhynchus mykiss) between with the device and with a non-stretchable string. In girth measurement of thirty rainbow trout with the device and with the string by five testers, time required for measurement of girth with the device was shorter (about 1.2-3.6 times) than that with the string, regardless of measurement skill of tester. In ten time girth measurement of each twenty rainbow trout with the device and with the string, the range of CV (coefficient of variation) was from 0.46 to 0.98 in the device and from 1.18 to 3.20 in the string. The device provided more precise measurement values than the string. After a set of one hundred rainbow trout of which fork length was recorded was prepared, two testers measured girth of each trout with the device and the string. There was no significant between-tester variation in relationship of fork length to girth in measurement with the device (p>0.05, multiple regression analysis), but significant difference was found in that with the string (p=0.02). This means less variation between users and that the device provided more stable values in girth measurement than the string. The girth-measurement device developed in this study allows us to measure fish girth more efficiently and precisely. (author abst.) |
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