Nofima reports

Rapport/Report 18/2003 English summary

Sivertsen, Agnar Holten; Heia, Karsten

Publication details

Publisher: Nofima AS (tidligere Fiskeriforskning)

Issue: 18/2003

Number of pages: 18

International Standard Numbers:
Printed: 82-7251-529-6

Open Access: green


The market value of the King crab (Paralithodes camtschaticus) legs is heavily influenced by the muscle content. There exist no objective method for measuring the muscle content in boiled crab legs, and its common to use the ratio between the muscle diameter and the shell diameter as an estimate for the fullness ratio. We have seen that this estimator can overestimate the fullness ratio with 60%. We have proposed a new estimator which halves the mean square error of the fullness ratio. To day there exist no methods for measuring the fullness ratio legs from in live crabs. We have tested two different methods for measuring the fullness ratio in fresh crab legs: NIR transmission and NIR transflection. We conclude that NIR transflection shows promising results, but it is to early to conclude upon whether this method can be used on live crabs or not.