Unrefined Peanut Oil as a Lipid Source in Diets for Juveniles of Two‐banded Seabream Diplodus vulgaris

Abstract

A feeding study with Two-banded Seabream Diplodus vulgaris was conducted to determine the effects of replacement of fish oil (FO) by unrefined peanut oil (PO) on growth performance, feed utilization, body composition, fatty acid composition, and serum biochemical and hematological variables. Three isonitrogenous (35.8%) and isoenergetic (21.15 kJ/g) diets were formulated by replacing dietary FO with PO at levels of level 0% (PO 0 ), 50% (PO 50 ), or 100% (PO 100 ). Fish were fed twice a day until satiation for an experimental period of 8 weeks. The best growth performance was observed in fish fed with the PO 0 and PO 50 diets. A significant increase was observed in hematocrit and mean corpuscular volume levels of fish fed with PO 50 diet compared with the other groups. Hemoglobin, mean corpuscular hemoglobin, total protein, albumin, and globulin were not affected by dietary PO treatment and did not differ among experimental groups. The glucose level was highest in the PO 100 group. Triglyceride and cholesterol levels were lower in fish fed diets with PO inclusions than in those fed the control diet. The fatty acid composition of fish was significantly affected by the experimental diets. Glutamic oxaloacetic transaminase, glutamic pyruvictransaminase, lactate dehydrogenase, and alkaline phosphatase were not affected by dietary PO treatment. The n-3:n-6 ratio in fish fed the PO 0 diet was also higher than in fish fed the PO-supplemented diets. The results of the present study showed that FO could be substituted by PO up to 50% in Two-banded Seabream diets without any negative effect on growth performance or serum biochemical and hematological features.The marine aquaculture industry in the Mediterranean region is mainly concentrated on two fish species, namely the Gilthead Seabream Sparus aurata and European Seabass Dicentrarchus

Evaluation of Protein Levels in Diets for Salema Porgy (<i>Sarpa salpa</i>) Juveniles, a New Candidate Species for the Mediterranean Aquaculture

“…In contrast, increased FCRs in zebra seabream [22] and gilthead seabream [43] were reported with increased dietary protein levels. The FCRs found in this study (1.24-1.89) were comparable with those reported earlier for two banded seabream (D. vulgaris) (1.50-1.80, 1.36-2.96, 1.67-1.92) [30,44,45], in zebra seabream (1.69-3.33) [22], and in gilthead seabream (0.91-3.06, 1.14-3.73, 1.22-1.74, 1.24-1.48, 1.37-1.53) [20,27,28,43,46], respectively. Higher FCR of 2.51 was found in axillary seabream (Pagellus acarne), introduced as a new candidate species for the Mediterranean aquaculture by [19], while lower FCRs of 1.1-1.2 were reported in gilthead seabream [47].…”

Effect of different dietary lipid sources on growth performance and nutrient utilization of + Nile tilapia ( Oreochromis niloticus ) fingerlings

“…Thus, VOs have been considered as a suitable replacement for marine FO, especially for fish species such as tilapia, which has preference for n -6 Fas [17,18]. Lipid sources from plants are considered to be good alternatives to FO to support sustainable aquaculture production; production of plant oils is increasing and prices are lower than those for FO [22]. However, the source and levels of dietary lipids in fish diets affect growth performance and health of fish [19,12].…”

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“…Growth performance and feed utilization of experimental fish were calculated described by Kesbiç et al, (2016).…”