scholarly journals The Synergistic Effects of Combined Use of Mentha longifolia, Thymus carmanicus, and Trachyspermum copticum on Growth Performance, Feed Utilization, and Expression of Key Immune Genes in Rainbow Trout (Oncorhynchus mykiss)

2022 ◽  
Vol 8 ◽  
Author(s):  
Mehdi Raissy ◽  
Mehdi Ahmadi Kabootarkhani ◽  
Kimia Sanisales ◽  
Mohammad Mohammadi ◽  
Ghasem Rashidian
Keyword(s):  
Rainbow Trout ◽  
Growth Performance ◽  
Growth Parameters ◽  
Synergistic Effects ◽  
Immune Gene ◽  
Positive Effects ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Mentha Longifolia ◽  
Trachyspermum Copticum ◽  
T1 And T2

Medicinal plants exhibit remarkable positive effects on different aspects of fish physiology. This study aimed to evaluate the possible impact of a combination of plants (Mentha longifolia, Thymus carmanicus, and Trachyspermum copticum) on growth performance, immune responses and key immune gene expression of rainbow trout. For this purpose, four diets were designed, including zero, 0.25, 0.5, and 1% of a mixture of plants per kg of diet, representing dietary treatments of control, T1, T2, and T3, respectively. Two hundred forty fish (weighing 23.11 ± 0.57 g) were fed 3% of body weight twice a day for 45 days. The results showed that growth parameters of weight gain (except for T1) and FCR were significantly improved in fish receiving all levels of plants, with T3 showing the best growth results. Digestive enzymes activities were notably increased in T1 and T2 compared to the control. Stress biomarkers (glucose and cortisol) were significantly decreased in T1 and T2, while T3 was not significantly different from the control. Immunological responses were significantly improved in T2, while T1 andT3 did not show a statistical difference in terms of lysozyme activity. Catalase activity was noticeably decreased in T1, although superoxide dismutase and malondialdehyde were highest in T2. Immune-related genes were significantly up-regulated in T3 compared to other treatments. Also, antioxidant enzyme coding genes were strongly up-regulated in T2 and T3. Overall, the present results suggest that 1% inclusion of the mixture of M. longifolia, T. carmanicus, and T. copticum (T2) can be used to improve the growth and immunity of rainbow trout.

scholarly journals Enhancement of growth performance and hematological changes in rainbow trout (Onchorhynchus mykiss) alevins fed with Bifidobacterium bacteria

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
Javad Sahandi ◽  
Hojatollah Jafaryan ◽  
Mehdi Soltani ◽  
Pouneh Ebrahimi
Keyword(s):  
Growth Rate ◽  
Rainbow Trout ◽  
Growth Performance ◽  
Feed Conversion ◽  
Growth And Survival ◽  
Commercial Diet ◽  
Positive Effects ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Significant Difference ◽  
Hematological Changes

The study of probiotic application as an important rearing strategy was started more than 30 years ago and most of these studies were carried out to increase growth and survival of larvae. Effect of Bifidobacterium animalis PTTC-1631 and B. lactis PTTC-1736 as probiotic supplement has been studied on growth performance and hematological changes on rainbow trout, Oncorhynchus mykiss alevins with initial body weight of 0.583 ± 0.197 g. The commercial diet was supplemented with graded levels of probiotics (1×107, 2×107 and 3×107 CFU g-1 dry feed) to obtain 3 sets of experimental diets (T1, T2, andT3 respectively) and fed four times a day for 60 days. T1 alevin showed the best growth performance in terms of specific growth rate, weight gain, metabolic growth rate, feed conversion ratio and survival rate. The highest red and white blood cell concentrations were noticed in fish fed T2 and T3 diets, respectively, no significant difference was observed in hemoglobin content. T1 showed the significant elevation of serum biochemical parameters and reduction of cortisol level. The results of present study might suggest likely positive effects of probiotic supplements with concentration of 1×107 CFU g-1 dry feed on growth and hematology on rainbow trout alevins.

Influence of defensible and indefensible pattern of food delivery upon the development of feeding anticipatory activity (FAA) and growth performance in rainbow trout (Oncorhynchus mykiss)

2011 ◽  
Vol 61 (1) ◽  
pp. 95-109
Author(s):  
M. Saeed Heydarnejad
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Growth Performance ◽  
Growth Parameters ◽  
Feeding Activity ◽  
Food Delivery ◽  
Fish Growth ◽  
Restricted Feeding ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Anticipatory Activity

AbstractUsing two methods of food delivery, defensible (D) and indefensible (ID), the effect of restricted feeding (RF) on the development of feeding anticipatory activity (FAA) and growth performance of rainbow trout (Oncorhynchus mykiss) was investigated. Six glass aquaria (120 × 30 × 80 cm), divided equally into 3 sections of morning, afternoon and evening of location of food delivery each with eight fish were selected for D and ID methods. The fish were subjected to a time-RF schedule for 70 days. Food delivery was restricted to three feeding periods; one hour per feeding session: morning (0800-0900 h), afternoon (1300-1400 h) and evening (1800-1900 h). Food was withheld on days 28, 42, 56 and 70 (test days) to assess FAA by the fish and fish growth parameters were determined at the end of the experiment. The present results clearly indicate that only using an indefensible (ID) pattern of food delivery, rainbow trout can simultaneously anticipate three daily meals and synchronise their feeding activity before the period of food availability and that the best FCR and SGR were achieved when an ID pattern of food delivery was offered. The lack of development of FAA for fish in the D method could be due to development of dominant hierarchies. This led to reduction of most growth parameters in the D method compared to the ID one.

scholarly journals Graded Incorporation of Defatted Yellow Mealworm (Tenebrio molitor) in Rainbow Trout (Oncorhynchus mykiss) Diet Improves Growth Performance and Nutrient Retention

Animals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 187 ◽  
Author(s):  
Paulo Rema ◽  
Subramanian Saravanan ◽  
Benjamin Armenjon ◽  
Constant Motte ◽  
Jorge Dias
Keyword(s):  
Body Composition ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Growth Performance ◽  
Tenebrio Molitor ◽  
Nutrient Digestibility ◽  
Protein Meal ◽  
Yellow Mealworm ◽  
Juvenile Rainbow Trout ◽  
Rainbow Trout Oncorhynchus Mykiss

Insects are emerging as a sustainable alternative to fishmeal and fish oil in aquafeeds. This study assessed the effect of graded incorporation levels of defatted yellow mealworm (Tenebrio molitor) protein meal on juvenile rainbow trout (Oncorhynchus mykiss) growth performance, body composition, and apparent nutrient digestibility. The trial comprised five dietary treatments: control diet with 25% fishmeal, and four experimental diets with yellow mealworm protein meal at 5%, 7.5%, 15%, or 25%, which corresponded to a fishmeal replacement of 20%, 30%, 60%, or 100%, respectively. After 90 days, the graded incorporation of insect protein meal led to a significant stepwise increase in final body weight, and a significant improvement of specific growth rate, feed conversion ratio, and protein efficiency ratio compared to the control treatment. Regardless of the incorporation level, the insect protein meal had no effects on fish whole-body composition and apparent digestibility coefficients of dry matter, protein, fat, phosphorus, and energy. Protein, phosphorus, and energy retention significantly increased in fish fed the diets with an insect protein meal. In conclusion, the yellow mealworm protein meal could effectively replace 100% of fishmeal in the diet of juvenile rainbow trout with positive effects on its overall zootechnical performance.

scholarly journals Pike-Perch (Sander lucioperca) and Rainbow Trout (Oncorhynchus mykiss) Fed with an Alternative Microorganism Mix for Reducing Fish Meal and Oil—Fishes’ Growth Performances and Quality Traits

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1799
Author(s):  
Michaela Schafberg ◽  
Karin Loest ◽  
Andreas Müller-Belecke ◽  
Sascha Rohn
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Growth Performance ◽  
Fish Meal ◽  
Control Diet ◽  
Sander Lucioperca ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Growth Performances ◽  
Pike Perch ◽  
Carcass Parameters

In the last decades, several plant-based materials were used for the substitution of fish meal and oil in aquaculture. The present study evaluated the fish quality and the sensory differences of rainbow trout (Oncorhynchus mykiss) and pike-perch (Sander lucioperca) from three different feeding groups, which were fed a commercially available industrial (standard) diet, a control diet, and a special microorganism-based feed mix. This feed mainly consisted of a mix made of Rhodotorula glutinis, Crypthecodinium cohnii, and Arthrospira sp. and had 50% less fish meal and fish oil compared to typical control diets. At the beginning, the pike-perch population was six months old, and the rainbow trout population was 15 months old. The feeding study duration was 16 weeks and every four weeks the growth performance and several morphometric parameters were recorded. Afterwards, sensory evaluation took place to identify possible trends. Sensory evaluation revealed that the rainbow trout groups did not show any significant differences to the standard and control fish fillets with regard to odor, texture, and taste. The effects on rainbow trout growth performances and carcass parameters were similar to the standard group. The feed mix was not optimal for pike-perch farming, which was also reflected by significantly adversely affected growth performance and carcass parameters. The sensorial evaluation showed an opposite trend: here, only small differences in the fillets from the feed mix and standard/control diet were observed.

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