WWW.WAS.ORG • WORLD AQUACULTURE • MARCH 2014 63 SFA content, the sturgeon hybrids fed the control diet presented a 1:1.5:1.3 ratio, which is still a favorable value. Moreover, the ratio of PUFA/SFA was considered a criterion in the quantification of healthy meat product. The minimum value should not be less than 0.45 (Nürnberg et al. 1998). From a dietetic point of view, the ratio of n-6 and n-3 fatty acids have great importance. Simopoulos (2001) recommended a n-6/n-3 ratio of 4-6 in functional food products. The n-6/n-3 ratio in sturgeon hybrid fillets was favorable. The control diet resulted in a ratio of 0.52 and the experimental diet was 0.86 (Fig. 3). This can be explained by the increased linseed oil content of the diet, which resulted in an increase in n-6 content relative to fish fed the control diet. variable were analyzed. Experimental data results were processed by Statistica Statsoft Version 09 (ANOVA) and Microsoft Excel. Results There was a signficant difference in the dry matter and lipid content of fillets from fish fed the two diets (Table 2). The lipid content of fillets of sturgeon hybrids fed the control diet was greater than that of the diet supplemented with linseed oil. Table 3 presents the fatty acid composition of fillets of fish from control and linseed-supplemented diets. The diet supplemented with linseed oil resulted in greater PUFA and n-6 content of fillets. According to Okuyama et al. (1996) the ratio of SFA/MUFA/PUFA 1:1.5:1 is the ideal value. Because of the lower (CONTINUED ON PAGE 64) TABLE 1. Proximate composition (in percent of dry matter for each constituent) of experimental fish diets. Diet Dry matter Crude protein Crude fat NFE Crude ash Fiber sturgeon diet 90.3 45 15 21 8 2.5 sturgeon diet 90.3 45 20 21 8 2.5 + 5 percent linseed oil TABLE 3. Fatty acid composition (as percent of total lipid content) of hybrid sturgeon samples. Diet SFA MUFA PUFA n-6 n-3 sturgeon diet 23.8b 34.5b 30.7a 10.6a 20.1a sturgeon diet 21.6a 32.0a 36.3b 16.7b 19.6a + 5 percent linseed oil Mean values with a different superscript within the same column are significantly different at (P< 0.05). TABLE 2. Chemical composition (in percent of each constituent) of sturgeon hybrid fillet samples. Diet Dry matter content Crude protein content Crude lipid content sturgeon diet 27.9b 18.2a 7.5b sturgeon diet 25.7a 18.1a 5.9a + 5 percent linseed oil Mean values with a different superscript within the same column are significantly different at (P< 0.05). TABLE 3. n-3 fatty acid content of fish fillets. Diet n-3 as percent of total lipid content Lipid content (g/100 g fillet) n-3 content (g/100 g fillet) sturgeon diet 20.1 7.53 1.52 sturgeon diet 19.6 5.91 1.16 + 5 percent linseed oil
RkJQdWJsaXNoZXIy MjExNDY=