Mevlut Aktas, Munevver Ayce Genc, Ahmet Bozkurt, Ercument Genc, Mehmet Naz
The objective of study was to evaluate the differences in the molecular weight profiles and the biochemical compositions of potential feed ingredients such as fish meal (FM), Artemia nauplii (ArtN), Artemia metanauplii (ArtMn), copepod meal (CopM), dry Daphnia sp. (dryD), Daphnia magna (freshD) and Tubifex. The lowest and highest ash (ArtN 5.84±0.05%, 45.18±1.17% dryD) lipid (dryD 4.71±0.06%, ArtN 30.19±0.65%) and protein contents (45.45±3.90% freshD, 66.74±0.2% CopM) were detected (p<0.05). The highest palmitic acid and oleic acid levels were found in dryD and ArtMn, respectively. Except for freshD, the linoleic acid levels were relatively low. Linolenic acid level was just found Tubifex and dryD. The highest docosahexaenoic acid and eicosapentaenoic acid levels were observed in fish meal and copepod meal, respectively. The highest and lowest levels of feed ingredients used were determined in 2532>= Da and 2532-13000 Da, respectively. The highest molecular weight profile belongs to 67000<=Da was observed in Tubifex. In conclusion, accorded to their nutritional levels of tested ingredients can make important contributions to microdiet formulations. Considering this molecular weight profiles data results cautioned that the use of all feed ingredients except for Tubifex in microdiet formulations may cause the high leaching ratios containing 2532>= Da molecular weight.
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