The effects of different levels of boron supplementation to feed on the growth parameters of rainbow trout (Oncorhynchus mykiss) were investigated for the first time using four diet variations (0.01%, 0.05%, 0.10%, and 0.20% of boron in feed) in addition to a control diet (without boron). After 120 days of feeding, the final weight (FW), weight gain, condition factor, feed intake, feed conversion rates, specific growth rate, protein efficiency ratio, survival rates, economic conversion rate, and economic profit index were calculated for each treatment and compared with the control as growth parameters. The initial weight was 17.89 ± 1.12 g; at the end of feeding, the FWs were determined as 89.91 ± 2.11 g for the control and 90.56 ± 1.34 g, 99.21 ± 3.76 g, 88.14 ± 2.43 g, and 78.74 ± 1.47 g for 0.01%, 0.05%, 0.10%, and 0.20% of boron feed treatments, respectively. The results of this study show that feeding rainbow trout with 0.05% boron-supplemented feed stimulates the growth parameters, but 0.20% of boron supplementation inhibits the growth of rainbow trout.

In the present study, black cumin oil in the rates of 0.00 % (the control), 0.10 %, 0.40 %, 0.70 %, 1.00 % and 1.30% was added to rainbow trout feed for 144 days. After the feeding process, trout were harvested and stored at 2 ± 1°C in ice, and changes in chemical, microbiological, and sensory parameters were examined periodically. According to sensory analyses, black cumin oil used in fish meat did not cause a perceptible sensory change for all groups. Chemical analyses showed that the addition of black cumin oil to fish feed led to higher total volatile basic nitrogen content in the fish flesh. During the storage period, the highest peroxide values were observed in the groups with 1.0% and 1.3% black cumin oil added, and the lowest were in the groups with 0.0% and 0.1% added oil. The highest microbial count value was observed in the control group.

In this study, body composition and fatty acid profiles were compared between farmed and wild rainbow trout; the latter escaped from farms to nature and fed natural food. The total crude protein, lipid, ash, dry matter and fatty acid composition of fish meat were determined. The results indicated that the wild rainbow trout contained a significant higher amount of crude protein, ash, dry matter, total saturated fatty acids (SFA) and eicosapentaenoic acid (EPA); and a lower amount of lipid, total monounsaturated fatty acids (MUFA), total polyunsaturated fatty acids (PUFA), and docosahexaenoic acid (DHA) compared with the farmed rainbow trout.

The wide-ranging use of antibiotics and medicaments has resulted in chemical residue and resistant pathogens in cured fish. Chemical residue not only pollutes the environment, but also threatens consumer’s health. On the contrary, garlic as a well-known natural antibiotic that causes no environmental or physical side effects has shown to be effective for the treatment of many diseases in humans and animals. In aquaculture applications, garlic promotes growth, improves the immune system, stimulates appetite, and reinforces the control of fungal and bacterial pathogens. This review emphasis on the application of garlic in promotes of fish growth and the expectations of using garlic arrangements in aquaculture.

In this study, different amounts of glutamine were added to the diet of rainbow trout, and they were then fed for a period of 90 days. The current research investigated the effects of glutamine on various aspects of rainbow trout, including growth performance, condition factor, viscerosomatic index, hepatosomatic index, carcass composition, fatty acid profile, hematological parameters, and biochemical parameters. The study's findings revealed that adding glutamine to the diet of rainbow trout had a beneficial impact on their growth features. The rainbow trout group that was fed a 2% concentration of glutamine experienced the most notable increase in growth rate. A statistically significant difference in growth was observed among all groups (p < 0.05). Adding glutamine to the diet increased the amount of protein and decreased the fat content in the flesh of the fish. Glutamine exerted an influence on the blood and biochemistry parameters of fish, as well as their fatty acid composition. In conclusion, the inclusion of glutamine in the diet of fish could potentially enhance their immune system, improve the quality of their muscles, and enhance their growth performance.

In this study, the body composition and fatty acid profiles of Salmo trutta macrostigma living under natural conditions in Anatolia were analyzed. The total crude protein, lipid, ash, dry matter and fatty acid profile of fish meat were determined. Crude protein, lipid, ash and moisture of Salmo trutta macrostigma were 19.92%, 3.461%, 1.18% and 75.11% respectively. The predominant fatty acids found in Salmo trutta macrostigma muscle were myristic acid (C14:0, 2.23), palmitic acid (C16:0; 18.81%), palmitoleic acid (C16:1, 8.82%), stearic acid (C18:0; 4.11%), oleic acid (C18:1 n9; 11.93%), linoleic acid (C18:2n6, 3,72%), linolenic acid (C18:3n3, 9.27%), eicosapentaenoic acid (EPA; C20:5 n3; 7.48%) and docosahexaenoic acid (DHA; C22:6n3; 7.69%).The Fatty acid composition analyses showed that wild Salmo trutta macrostigma consisted of 29.17% saturated (SFA), 21.58% monounsaturated (MUFAs) and, 31.21% polyunsaturated acids (PUFAs).