The association between 'mushy halibut syndrome' and micronutrient and fatty acid composition of Greenland halibut fillets (Reinhardtius hippoglossoides)

This study investigated the micronutrient and fatty acid composition (FAC) of Greenland halibut fillets with and without 'Mushy Halibut Syndrome' (MHS). Fillets severely affected by MHS had significantly decreased potassium content and increased sodium content. Monounsaturated fatty acids (MUFAs) constituted the largest fraction of fatty acids for all fillets; however, MHS-fillets showed decreased levels of MUFAs 18:1 (n-9) and 16:1 (n-7), and increased levels of MUFAs 22:1 (n-11) and 24:1 (n-9). Saturated fatty acids (SFAs) were the second largest fatty acid fraction in normal fillets, but in MHS-fillets, polyunsaturated fatty acids (PUFAs) constituted the second largest fraction. Our findings indicate a difference in dietary status between halibut with and without MHS, reflected by altered FAC and micronutrient content. This suggests a difference in feeding behavior, prey selection, or nutrient assimilation. The information in this study provides valuable input for quality control and for differentiation of composition features related to MHS.