An aggregated sample of 925 Atlantic cod Gadus morhua collected by four countries in different regions of the Baltic Sea during different seasons were measured (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 LS and gutted M are provided.
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 H.J.; Hussy K.; Radtke K.; Krumme U.. - In: JOURNAL OF FISH BIOLOGY. - ISSN 1095-8649. - STAMPA. - 95:6(2019), pp. 1486-1495. [10.1111/jfb.14171]
Effects of freezing on length and mass measurements of Atlantic cod Gadus morhua in the Baltic Sea
Casini M.;
2019
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 measured (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 LS and gutted M are provided.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.