Skip Navigation


ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on April 25, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(5):939-944; doi:10.1093/icesjms/fsm047
This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrow All Versions of this Article:
64/5/939    most recent
fsm047v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Harbitz, A.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Harbitz, A.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Estimation of shrimp (Pandalus borealis) carapace length by image analysis

Alf Harbitz

Institute of Marine Research, PO Box 6404, N-9294 Tromsø, Norway

tel: +47 77 609731; fax: +47 77 609701; e-mail: alf.harbitz{at}imr.no

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 x 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

Received 27 January 2006; accepted 5 March 2007; advance access publication 25 April 2007.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.