Effect of commercial diets on growth, condition factor and feed conversion of rainbow trout, Oncorhynchus mykiss Kamloops (Jordan 1892) during freshwater stage development

Aquaculture ◽  
1994 ◽  
Vol 124 (1-4) ◽  
pp. 290
Author(s):  
Maritza Leonardi ◽  
Rolando Vega ◽  
Eduardo Tarifeño
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Growth Condition ◽  
Condition Factor ◽  
Feed Conversion ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Commercial Diets ◽  
Stage Development

Relative Contributions of Dietary and Waterborne Copper to Tissue Copper Burdens and Waterborne-Copper Tolerance in Rainbow Trout (Oncorhynchus mykiss)

1993 ◽  
Vol 50 (8) ◽  
pp. 1683-1689 ◽  
Author(s):  
P. A. Miller ◽  
R. P. Lanno ◽  
M. E. McMaster ◽  
D. G. Dixon
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Growth Condition ◽  
Condition Factor ◽  
Copper Tolerance ◽  
Food Conversion ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Lethal Level ◽  
Cu Tolerance ◽  
Food Conversion Efficiency

In a 42-d study, rainbow trout (Oncorhynchus mykiss) were fed a diet containing either 13 or 684 mg Cu∙kg−1 and simultaneously exposed to waterborne-Cu concentrations of 5, 32, 55, or 106 μg∙L−1 (low-Cu diet) or 13, 38, 62, or 127 μg∙L−1 (high-Cu diet). There were no significant effects on mortality, growth, condition factor, or food conversion efficiency. Elevated dietary Cu increased Cu concentrations in liver (p < 0.001), kidney (p < 0.001), gill (p = 0.005), and digesta (p < 0.001). Increasing waterborne-Cu concentrations elevated Cu concentrations in liver (p = 0.018) and kidney (p = 0.002) but not in gill (p = 0.930) or digesta (p = 0.519). Waterborne-Cu exposure increased Zn concentrations in liver (p = 0.025) but decreased those in kidney (p = 0.045). For fish on the high-Cu diet, diet provided 99, 85, and 63% of the Cu in the liver for the 38, 62, and 127 μg∙L−1 waterborne-Cu treatments, respectively. Based on Cu tolerance (incipient lethal level for Cu), dietary and waterborne Cu partitioned into functionally different compartments. Although both waterborne-Cu (p < 0.00001) and dietary-Cu (p = 0.019) preexposure increased Cu tolerance, waterborne Cu had a much greater impact.

scholarly journals Growth, survival, and body composition of rainbow trout, Oncorhynchus mykiss, when dietary fish meal is replaced with silkworm (Bombyx mori) pupae

2016 ◽  
Vol 24 (1) ◽  
pp. 53-57 ◽  
Author(s):  
Matin Shakoori ◽  
Hamed Gholipour ◽  
Samira Naseri ◽  
Hossein Khara
Keyword(s):  
Body Composition ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Specific Growth ◽  
Feed Conversion ◽  
Sr Protein ◽  
Treatment Groups ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Silkworm Pupae ◽  
Dietary Fish

Abstract The effects of substituting fishmeal (FM) with different quantities of silkworm pupae (SP) on the growth, survival, and body composition of rainbow trout, Oncorhynchus mykiss (Walbaum), were investigated over the course of a 60-day experiment. A total of 360 fingerlings (55±3.42 g) were randomly allotted to four treatment groups (T1 – fish fed 52.5% FM; T2 – fish fed 5% SP + 47.5% FM; T3 – fish fed 10 % SP+ 42.5% FM; T4 – fish fed 15% SP + 37.5% FM). Each treatment group was divided into three replicates of 30 fish per replicate. One group served as the control. At the end of the experiment, the results showed that 10% of FM can be replaced with SP without any adverse effects on the values of the feed conversion ratio (FCR), specific growth rate (SGR), weight gain percent (WG), condition factor (CF), survival rate (SR), protein content, lipid content, or nutrition protein utilization (NPU).

scholarly journals Sublethal Cobalt Toxicity Effects on Rainbow Trout (Oncorhynchus mykiss)

2019 ◽  
Vol 77 (4) ◽  
pp. 243-252
Author(s):  
Fereshteh Nasri ◽  
Saeed Heydarnejad ◽  
Amin Nematollahi
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Specific Growth ◽  
The Body ◽  
Cobalt Concentration ◽  
Feed Conversion ◽  
Control Value ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Toxicological Studies ◽  
Essential Trace Elements

Abstract The purpose of this study was to investigate the sublethal Co toxicity on rainbow trout (Oncorhynchus mykiss). Trout were exposed to Co and selected parameters were evaluated at intervals of 1, 15 and 30 days. Fish exposed to higher levels of Co grew slower than fish exposed to lower levels of Co. Weight gain, specific growth rate (SGR) decreased linearly with the increase of cobalt in the water. The body condition factor (CF) of fish reared in water with low cobalt concentration decreased substantially but this decrease was not significant for fish exposed to higher cobalt concentration. The values of the feed conversion ratio (FCR) increased in fish exposed to higher levels of Co. Co significantly changed the activity of aspartate aminotransferase (AST) and alanine aminotransferase (ALT) and decreased at day 30, and in both cases this decrease was more remarkable at day 15 so that the level of AST and ALT reached the control value at day 30. The alkaline phosphatase (ALP) level also showed a remarkable 15-day decline. There was a significant increase in glucose (G) concentration in both Co-exposed groups on day 15. However, serum cholesterol (Chl) was significantly reduced on day 15 and increased on day 30; there were no significant differences in both exposed Co-groups. The triglyceride (TG) level also decreased substantially. There was no regular pattern of total protein (TP) in the serum, so that no significant differences were found in the level of TP between low and high-exposed fish. In summary, this study suggests that exposure of essential trace elements such as cobalt may change growth and biochemical parameters, and that measurement of these parameters may be used in toxicological studies to determine the general health status of fish.

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