Journal Article

Estimation of shrimp (<i>Pandalus borealis</i>) carapace length by image analysis

Alf Harbitz

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 64, issue 5, pages 939-944
Published in print July 2007 | ISSN: 1054-3139
Published online April 2007 | e-ISSN: 1095-9289 | DOI:
Estimation of shrimp (Pandalus borealis) carapace length by image analysis

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Harbitz, A. 2007. Estimation of shrimp (Pandalus borealis) carapace length by image analysis. — ICES Journal of Marine Science, 64: 939–944.

An image analysis technique was examined to assess its ability to estimate automatically the carapace length of shrimp (Pandalus borealis). Carapace length, pixel area, and weight were measured in a sample of 285 shrimp. An accurate slide calliper was used to measure the carapace length (13–30 mm) by an experienced operator with a precision (standard deviation) of ∼0.2 mm. A high-resolution still image camera was used to produce an 1810 × 1710 pixel colour image containing all 285 shrimp. The individual shrimp were segmented from the background by intensity thresholding. A linear model on a log-log scale of length in relation to pixel area yielded a precision of 0.43 mm. Despite differences in precision, the length frequency distributions based on manual and imaging techniques were similar. The central processing unit time spent by the image analysis program was <0.01 s per shrimp. This indicates the potential for precise, efficient, automatic processing of large numbers of shrimp lengths by, for example, video records of shrimp on a moving transport band.

Keywords: image analysis; length frequency distribution; length–weight relationship; shrimp carapace length; slide calliper measurements

Journal Article.  4084 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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