Evaluation of dietary fish oil: soybean oil ratios on growth performance feed utilization, haematological indices and body fatty acid composition of Keeled mullet, Liza carinata fingerlings | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 15, Volume 26, Issue 5, September and October 2022, Page 235-256 PDF (641.37 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2022.260722 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Ahmed M. Aboseif et al. | ||||
| Abstract | ||||
| Dietary fat is a vital component of fish nutrition. Fish oil (FO) is considered the best source of fat due to its balanced fatty acid content. This prompted nutritionists to consider reducing the reliance on fish oil in fish diets by substituting it for cheaper and more readily available vegetable oils. This study was conducted to investigate the effect of different dietary ratios of fish oil: soybean oil (SO). Four isonitrogenous (30.99% crude protein) and isolipidic (16.92%) diets were formulated to obtain four different dietary ratios of FO: SO. The formulated diets contained the tested oils, either as the sole source of (FO, FO100: SO0 and SO, FO0: SO100), or various combinations of FO and SO (FO75: SO25 and FO50: SO50). One hundred and eighty Liza carinata fingerlings with an initial weight of 1.54 ± 0.18 g were distributed into 12 plastic tanks (55L each, triplicate per treatment). The experiment was conducted for 60-days. The best significant (P < 0.05) FCR and protein efficiency ratio (PER) values were reported for FO75: SO25 diet, compared to the other experimental treatments. The results observed that the higher FO content (FO100: SO0 andFO75: SO25 diets) had higher n-3 FA content such as 20:5n3 EPA and 22:6n-3 DHA than the diet with higher SO ratios (FO50: SO50 and FO0: SO100). The results of the present study suggested that Liza carinata fingerlings fed diet FO75: SO25 for 60-days enhanced growth performance, diet utilization efficiency, FCR, and hematological indices. The body fatty acid (FA) profile in the experimental fish groups reflected the FA profile of their respective diets. | ||||
| Keywords | ||||
| Fish oil; Soybean oil; Fatty acid profile; Blood indicators; Liza carinata | ||||
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