Effects of freezing on length and mass measurements of Atlantic cod Gadus morhua in the Baltic Sea

K. McQueen*, M. Mion, A. Hilvarsson, M. Casini, Hans Jakob Olesen, Karin Hüssy, K. Radtke, U. Krumme

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

An aggregated sample of 925 Atlantic cod Gadus morhua collected by four countries in different regions of the Baltic Sea during different seasons were measure (total length, LT = 161–890 mm and weighed (mass, M = 45–6900 g) both before freezing and after defrosting. The cod were found to decrease significantly in both LT and M following death and frozen storage. There was an average (± SD) change in LT of –2.91% (± 0.05%) following freezing, independent of starting LT. Total M changed by –2.65% (± 0.14%), independent of starting mass. Shrinkage of LT and M did not differ significantly between 1 and 4 months frozen storage, though LT shrinkage was significantly greater after 1 or 4 months in the freezer compared with after 5 days. There was significant variation in LT and M shrinkage between regions of capture. A significant negative relationship between condition of cod and LT or M change was also observed. Equations to back‐calculate fresh LT and M from thawed LT, M and standard length (LS), gutted LT, gutted LTg and gutted mass (Mg) are provided.
Original languageEnglish
JournalJournal of Fish Biology
Volume95
Issue number6
Pages (from-to)1486-1495
ISSN0022-1112
DOIs
Publication statusPublished - 2019

Keywords

  • Baltic Sea
  • Cod
  • Freezing
  • Gadus morhua
  • Measurement bias
  • Shrinkage

Cite this

McQueen, K. ; Mion, M. ; Hilvarsson, A. ; Casini, M. ; Olesen, Hans Jakob ; Hüssy, Karin ; Radtke, K. ; Krumme, U. / Effects of freezing on length and mass measurements of Atlantic cod Gadus morhua in the Baltic Sea. In: Journal of Fish Biology. 2019 ; Vol. 95, No. 6. pp. 1486-1495.
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title = "Effects of freezing on length and mass measurements of Atlantic cod Gadus morhua in the Baltic Sea",
abstract = "An aggregated sample of 925 Atlantic cod Gadus morhua collected by four countries in different regions of the Baltic Sea during different seasons were measure (total length, LT = 161–890 mm and weighed (mass, M = 45–6900 g) both before freezing and after defrosting. The cod were found to decrease significantly in both LT and M following death and frozen storage. There was an average (± SD) change in LT of –2.91{\%} (± 0.05{\%}) following freezing, independent of starting LT. Total M changed by –2.65{\%} (± 0.14{\%}), independent of starting mass. Shrinkage of LT and M did not differ significantly between 1 and 4 months frozen storage, though LT shrinkage was significantly greater after 1 or 4 months in the freezer compared with after 5 days. There was significant variation in LT and M shrinkage between regions of capture. A significant negative relationship between condition of cod and LT or M change was also observed. Equations to back‐calculate fresh LT and M from thawed LT, M and standard length (LS), gutted LT, gutted LTg and gutted mass (Mg) are provided.",
keywords = "Baltic Sea, Cod, Freezing, Gadus morhua, Measurement bias, Shrinkage",
author = "K. McQueen and M. Mion and A. Hilvarsson and M. Casini and Olesen, {Hans Jakob} and Karin H{\"u}ssy and K. Radtke and U. Krumme",
year = "2019",
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Effects of freezing on length and mass measurements of Atlantic cod Gadus morhua in the Baltic Sea. / McQueen, K.; Mion, M.; Hilvarsson, A.; Casini, M.; Olesen, Hans Jakob; Hüssy, Karin; Radtke, K.; Krumme, U.

In: Journal of Fish Biology, Vol. 95, No. 6, 2019, p. 1486-1495.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effects of freezing on length and mass measurements of Atlantic cod Gadus morhua in the Baltic Sea

AU - McQueen, K.

AU - Mion, M.

AU - Hilvarsson, A.

AU - Casini, M.

AU - Olesen, Hans Jakob

AU - Hüssy, Karin

AU - Radtke, K.

AU - Krumme, U.

PY - 2019

Y1 - 2019

N2 - An aggregated sample of 925 Atlantic cod Gadus morhua collected by four countries in different regions of the Baltic Sea during different seasons were measure (total length, LT = 161–890 mm and weighed (mass, M = 45–6900 g) both before freezing and after defrosting. The cod were found to decrease significantly in both LT and M following death and frozen storage. There was an average (± SD) change in LT of –2.91% (± 0.05%) following freezing, independent of starting LT. Total M changed by –2.65% (± 0.14%), independent of starting mass. Shrinkage of LT and M did not differ significantly between 1 and 4 months frozen storage, though LT shrinkage was significantly greater after 1 or 4 months in the freezer compared with after 5 days. There was significant variation in LT and M shrinkage between regions of capture. A significant negative relationship between condition of cod and LT or M change was also observed. Equations to back‐calculate fresh LT and M from thawed LT, M and standard length (LS), gutted LT, gutted LTg and gutted mass (Mg) are provided.

AB - An aggregated sample of 925 Atlantic cod Gadus morhua collected by four countries in different regions of the Baltic Sea during different seasons were measure (total length, LT = 161–890 mm and weighed (mass, M = 45–6900 g) both before freezing and after defrosting. The cod were found to decrease significantly in both LT and M following death and frozen storage. There was an average (± SD) change in LT of –2.91% (± 0.05%) following freezing, independent of starting LT. Total M changed by –2.65% (± 0.14%), independent of starting mass. Shrinkage of LT and M did not differ significantly between 1 and 4 months frozen storage, though LT shrinkage was significantly greater after 1 or 4 months in the freezer compared with after 5 days. There was significant variation in LT and M shrinkage between regions of capture. A significant negative relationship between condition of cod and LT or M change was also observed. Equations to back‐calculate fresh LT and M from thawed LT, M and standard length (LS), gutted LT, gutted LTg and gutted mass (Mg) are provided.

KW - Baltic Sea

KW - Cod

KW - Freezing

KW - Gadus morhua

KW - Measurement bias

KW - Shrinkage

U2 - 10.1111/jfb.14171

DO - 10.1111/jfb.14171

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