scholarly journals Hermetia illucens meal as fish meal replacement for rainbow trout on farm

2017 ◽  
Vol 3 (3) ◽  
pp. 165-175 ◽  
Author(s):  
T. Stadtlander ◽  
A. Stamer ◽  
A. Buser ◽  
J. Wohlfahrt ◽  
F. Leiber ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Production Efficiency ◽  
Production Cycle ◽  
Feed Conversion ◽  
Hermetia Illucens ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Protein Utilisation ◽  
Certified Organic ◽  
Utilisation Efficiency ◽  
On Farm

In a 7-week on-farm feeding trial rainbow trout (Oncorhynchus mykiss) were provided with a diet containing 28% mechanically de-fatted insect meal prepared from larvae of the black soldier fly, Hermetia illucens (HIM) and compared to a control that received a certified organic and fishmeal based diet. In the test diet insect meal replaced almost 50% of the fishmeal. The whole experiment was conducted under practical conditions on an organically certified rainbow trout farm in Switzerland. Fish of initially 66.5±2.3 g body weight were grown to 125±4.5 g and assessed for their growth performance, as well as analysed for their proximate composition, feed conversion ratio, fatty acid contents and organoleptic properties. Improved lipid utilisation and decreased protein utilisation were observed in fish fed the HIM diet. Furthermore, in a controlled degustation no differences except a slightly darker coloration of fish fed HIM were observed. The experiment demonstrated that substantial replacement of fishmeal by insect meal is possible without compromising growth, feed conversion and product quality. However, the decreased protein utilisation efficiency in HIM fed fish might lower production efficiency when applied over a whole production cycle and not only over 7 weeks.

The impact of restricted rationing upon growth, food conversion efficiency and body composition of rainbow trout

1995 ◽  
Vol 31 (10) ◽  
pp. 219-223 ◽  
Author(s):  
M. Tomec ◽  
Z. Teskeredžic ◽  
E. Teskeredžic ◽  
M. Hacmanjek ◽  
E. McLean
Keyword(s):  
Body Composition ◽  
Rainbow Trout ◽  
Conversion Efficiency ◽  
Food Conversion ◽  
Lipid Levels ◽  
Feed Conversion ◽  
Body Lipid ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Feeding Regimes ◽  
The Impact

Juvenile rainbow trout, Oncorhynchus mykiss, maintained under commercial conditions, were subjected to four different feeding regimes. Duplicate groups of fish were fed to satiation 3 times/d for either 7, 3, 2 or 1 d/wk over a 10 wk period. At the end of the trial, evaluations were made of group growth performance, body composition, and feed conversion efficiency (FCE). At the end of the experiment, no differences were discerned between fish fed either daily or 3 times/wk with respect to growth, FCE or body composition. Animals placed upon the two lowest rations were significantly smaller (P<0.05) than those fed daily and exhibited decreased condition factors and body lipid levels (P<0.05) and increased moisture content (P<0.05). Food conversion was least efficient in those fish provided the largest ration.

scholarly journals Conjugated linoleic acid in diets for large-size rainbow trout (Oncorhynchus mykiss): effects on growth, chemical composition and sensory attributes

2007 ◽  
Vol 97 (2) ◽  
pp. 289-297 ◽  
Author(s):  
L. M. P. Valente ◽  
N. M. Bandarra ◽  
A. C. Figueiredo-Silva ◽  
P. Rema ◽  
P. Vaz-Pires ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Linoleic Acid ◽  
Conjugated Linoleic Acid ◽  
Liver Lipid ◽  
Dietary Treatment ◽  
Feed Conversion ◽  
Sensory Data ◽  
Liver Lipid Content ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Tissue Lipids

The effects of graded levels (0 %, 0·5 %, 0·75 and 1 %) of dietary conjugated linoleic acid (CLA) were assessed on 97 g rainbow trout. Fish were fed to satiation twice a day for 12 weeks. At the end of the experiment, all groups of fish weighed more than 250 g and no significant differences were detected in growth performance, feed conversion, nutrient or energy utilisation or body composition between treatments. A decrease in liver lipid content resulted from including CLA and was accompanied by a reduction in malic enzyme activity. The muscle saturated acid and PUFA content did not vary between dietary treatments, despite the increasing concentration of stearic acid and CLA. In the liver, however, both fractions increased significantly with dietary CLA. Moreover, the MUFA decreased significantly in both muscle and liver. CLA was incorporated into tissue lipids, with levels in flesh (2·1–4·2 %) being 2-fold higher than in liver (0·8–1·9 %). In muscle, the percentage of cis-9, trans-11 isomer ranged from 39·5 % to 41·8 % and that of trans-10, cis-12 isomer from 31·4 % to 33·4 % of total CLA. The incorporation of CLA isomers in the liver varied with dietary treatment, and the cis-9, trans-11 isomer seemed to be more efficiently incorporated than trans-10, cis-12. Sensory data indicated slight-to-moderate differences between the trout fed with and without CLA. The present results suggest that 250 g rainbow trout can incorporate CLA in both muscle and liver, contributing to the production of a functional food.

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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