scholarly journals The effects of dietary poly‐β‐hydroxybutyrate on growth parameters, intestinal microflora, and histopathology of rainbow trout, Oncorhynchus mykiss , fingerlings

2020 ◽  
Author(s):  
Tolga Şahin ◽  
Sevdan Yılmaz ◽  
İrfan Selçuk Yazıcı ◽  
Selçuk Berber
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Intestinal Microflora ◽  
Growth Parameters ◽  
Rainbow Trout Oncorhynchus Mykiss

Effects of Intermittent Chloramine-T Exposure on Growth, Serum Biochemistry, and Fin Condition of Juvenile Rainbow Trout (Oncorhynchus mykiss)

1994 ◽  
Vol 51 (8) ◽  
pp. 1728-1736 ◽  
Author(s):  
Mark D. Powell ◽  
David J. Speare ◽  
Neil MacNair
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Skin Diseases ◽  
Growth Parameters ◽  
Serum Biochemistry ◽  
Control Fish ◽  
Plasma Sodium ◽  
Juvenile Rainbow Trout ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Chloramine T

Chloramine-T is a commonly used therapeutic agent for the treatment of bacterial gill and skin diseases in the intensive aquaculture of salmonids; however, little is known about its effects on healthy fish. Juvenile rainbow trout (Oncorhynchus mykiss) were exposed weekly to 5, 10, and 20 mg active chloramine-T ingredient∙L−1 in a 20-tank replicate flow-through facility. Control fish were treated with tank water only. Growth parameters and haematocrits were taken twice weekly and serum biochemistry was measured on termination of the experiment. Absolute growth rates were suppressed but only statistically significantly in fish treated with 20 mg chloramine-T∙L−1 compared with controls. Fish exposed to 10 and 20 mg chloramine-T∙L−1 showed significant predisposition to an erosive dermatitis of the caudal fin which appeared to be caused by opportunistic pathogens of the genus Pseudomonas spp. and Flavobacter spp. Haematocrits decreased in controls and ail treatments. A significant concentration-dependent decrease in plasma sodium and chloride was observed. Plasma glucose levels did not vary and were similar to those reported for unstressed trout. We recommend that care be taken when using chloramine-T prophylactically and that concentrations of less than 10 mg∙L−1 be used.

scholarly journals Dietary valine improved growth, immunity, enzymatic activities and expression of TOR signaling cascade genes in rainbow trout, Oncorhynchus mykiss fingerlings

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ishtiyaq Ahmad ◽  
Imtiaz Ahmed ◽  
Nazir A. Dar
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Protein Content ◽  
Growth Parameters ◽  
Enzymatic Activities ◽  
Total Protein Content ◽  
Tor Signaling ◽  
Body Protein ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Dry Diet

AbstractThis study was conducted to determine the effects of dietary valine (Val) on growth, hemato-biochemical parameters, immunity, enzymatic activities, antioxidant status and expression of target of rapamycin (TOR) and 4E-BP genes in rainbow trout, Oncorhynchus mykiss (1.57 ± 0.03 g; 5.10 ± 0.34 cm). Six isonitrogenous (450 g kg−1) and isoenergetic (20.90 kJ 100 g−1, gross energy) diets were designed to represent varied Val levels (10.5, 13.0, 15.5, 18.0, 20.5 and 23.0 g kg−1 dry diet basis). Growth parameters improved significantly (P < 0.05) with the amelioration of dietary Val level up to 18.0 g kg−1. Highest (P < 0.05) body protein content was noted at 18.0 g kg−1 dietary Val. Significant differences in hematological, intestinal enzymatic activities and antioxidant parameters were noted. However, plasma variables did not show any significant differences except aspartate transaminase and uric acid. Total protein content increased significantly, while the albumin and globulin content did not show any significant (P > 0.05) difference. Moreover expression of TOR mRNA and elF4E-binding protein (4E-BP) was observed higher (P < 0.05) at 18.0 g kg−1 Val. On the basis of results, optimum dietary Val requirement for maximal growth of rainbow trout was determined to be 18.19 g kg−1 of dry diet, corresponding to 40.42 g kg−1 of dietary protein.

scholarly journals Partially Defatted Tenebrio molitor Larva Meal in Diets for Grow-Out Rainbow Trout, Oncorhynchus mykiss (Walbaum): Effects on Growth Performance, Diet Digestibility and Metabolic Responses

Animals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 229 ◽  
Author(s):  
Giulia Chemello ◽  
Manuela Renna ◽  
Christian Caimi ◽  
Inês Guerreiro ◽  
Aires Oliva-Teles ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Growth Parameters ◽  
Tenebrio Molitor ◽  
Negative Effects ◽  
Fishmeal Replacement ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Growth Trial ◽  
New Protein ◽  
Fish Performance

Insect meals are good candidates to replace fishmeal as new protein sources in aquafeeds. This study evaluated the effects of fishmeal replacement with different dietary inclusion levels of a partially defatted Tenebrio molitor (L.) larva meal (TM) on rainbow trout (Oncorhynchus mykiss Walbaum) growth, diet digestibility, and hepatic intermediary metabolism. A 154-day growth trial was performed with 252 rainbow trout (78.3 ± 6.24 g) randomly divided into twelve tanks and fed four experimental diets containing increasing levels of TM: 0% (TM0), 25% (TM25), 50% (TM50), and 100% (TM100) of fishmeal substitution, corresponding to TM dietary inclusion levels of 0%, 5%, 10%, and 20%, respectively. A digestibility trial was performed feeding 180 rainbow trout (94.6 ± 7.31 g) with the experimental diets used in the growth trial. The growth parameters were not affected by TM dietary inclusion. Regarding the evaluated apparent digestibility coefficients (ADC), only the ADC of crude protein was affected, showing the following trend: TM0 = TM25 > TM50 > TM100. The activities of key hepatic amino acid catabolic and lipogenic enzymes were not affected by the dietary composition. The results suggest that a partially defatted TM could totally replace fishmeal in commercial rainbow trout diets without negative effects on fish performance.

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