scholarly journals Use of feeds with different levels of protein in feeding larvae and fry of rainbow trout

2020 ◽  
pp. 182-188
Author(s):  
V.M. Kondratiuk
Keyword(s):  
Rainbow Trout ◽  
Different Levels

Effect of Different Levels of Fine-Sediment Loading on the Escapement Success of Rainbow Trout Fry from Artificial Redds

2008 ◽  
Vol 28 (3) ◽  
pp. 758-765 ◽  
Author(s):  
Thomas S. Fudge ◽  
Kerry G. Wautier ◽  
Robert E. Evans ◽  
Vince P. Palace
Keyword(s):  
Rainbow Trout ◽  
Fine Sediment ◽  
Sediment Loading ◽  
Different Levels

scholarly journals Nutritional regulation of glucokinase: a cross-species story

2014 ◽  
Vol 27 (1) ◽  
pp. 21-47 ◽  
Author(s):  
Stéphane Panserat ◽  
Nicole Rideau ◽  
Sergio Polakof
Keyword(s):  
Rainbow Trout ◽  
Animal Species ◽  
Feeding Habits ◽  
Present Review ◽  
Nutritional Regulation ◽  
Dietary Carbohydrates ◽  
Biochemical Characteristics ◽  
Nutritional Importance ◽  
Carnivorous Species ◽  
Different Levels

The glucokinase (GK) enzyme (EC 2.7.1.1.) is essential for the use of dietary glucose because it is the first enzyme to phosphorylate glucose in excess in different key tissues such as the pancreas and liver. The objective of the present review is not to fully describe the biochemical characteristics and the genetics of this enzyme but to detail its nutritional regulation in different vertebrates from fish to human. Indeed, the present review will describe the existence of the GK enzyme in different animal species that have naturally different levels of carbohydrate in their diets. Thus, some studies have been performed to analyse the nutritional regulation of the GK enzyme in humans and rodents (having high levels of dietary carbohydrates in their diets), in the chicken (moderate level of carbohydrates in its diet) and rainbow trout (no carbohydrate intake in its diet). All these data illustrate the nutritional importance of the GK enzyme irrespective of feeding habits, even in animals known to poorly use dietary carbohydrates (carnivorous species).

Use of two vegetable by-products as protein sources in rainbow trout feeding

1992 ◽  
Vol 55 (2) ◽  
pp. 277-284 ◽  
Author(s):  
F. J. Moyano ◽  
G. Cardenete ◽  
M. de la Higuera
Keyword(s):  
Rainbow Trout ◽  
Dietary Protein ◽  
Fish Meal ◽  
Nutrient Utilization ◽  
Average Weight ◽  
Protein Levels ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Meal Protein ◽  
By Products ◽  
Different Levels

AbstractTwo experiments were designed to test the possibility of partially replacing fish-meal protein in rainbow trout either with maize-gluten meal (MGM) (experiment 1) or potato protein concentrate (PPC) (experiment 2). Rainbow trout (Oncorhynchus mykiss) 30 g initial average weight were given diets containing different levels of MGM or PPC proteins ranging from 0 to 0·4 or to 0·6 of dietary protein, respectively. Substitutions of fish meal either by MGM or PPC were carried out establishing two different total dietary protein levels; 350 and 450 g/kg. Results showed that the MGM diets were acceptable and gave a significant enhancement (over 0·37 in the better case) in nutrient utilization when compared with those including only fish meal. On the contrary, diets including PPC were poorly accepted, and the growth offish and nutrient utilization were negatively correlated with dietary levels of PPC. It is concluded that levels of MGM representing around 400 g/kg diet can be used in foods for rainbow trout, whereas PPC appears not to be a suitable protein source for those fish.

Effects of stress on plasma homeostasis, endolymph chemistry, and check formation during otolith growth in rainbow trout (Oncorhynchus mykiss)

2004 ◽  
Vol 61 (7) ◽  
pp. 1247-1255 ◽  
Author(s):  
P Payan ◽  
H De Pontual ◽  
A Edeyer ◽  
G Borelli ◽  
G Boeuf ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Plasma Concentrations ◽  
Growth Stress ◽  
Significant Rise ◽  
External Stress ◽  
Otolith Growth ◽  
Ph Variation ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Different Levels

This is the first study in which the effects of an external stress were analysed at different levels: plasma ho meostasis, endolymph chemistry, and otolith growth. Stress was applied to rainbow trout (Oncorhynchus mykiss) by exposure to Cl2 gas. In the plasma of Cl2-stressed trout, Na+ and Cl– decreased (70 mmol·L–1) and K+ increased (2.0 mmol·L–1), whereas total Ca was unchanged. A slight hypercapny (+2.4 mmHg (1 mmHg = 133.322 Pa)) was observed related to a significant rise (40%) in total CO2 without pH variation. In the endolymph, Na+ and Cl– also decreased, whereas other parameters (K+, PO43–, Mg, and, peculiarly, total Ca) remained stable. The important effect provoked by Cl2 stress in endolymph was an increase of proteins (factor of 2.6) and total CO2 (factor of 3.1) concentrations at the proximal side of the endolymph. The stress induced a decrease in otolith growth rate and produced a discontinuity (check) in the microstructure pattern of the otolith characterized by a large D zone. The variations in the endolymph composition are discussed and we propose that they result not only from changes in plasma concentrations, but also from changes (organic and crystallization) in otolith deposition.

Measurement of vitellogenin from rainbow trout by rocket immunoelectrophoresis: application to the kinetic analysis of estrogen stimulation in the male

1985 ◽  
Vol 63 (9) ◽  
pp. 982-987 ◽  
Author(s):  
Jean Louis Maitre ◽  
Catherine Le Guellec ◽  
Stephane Derrien ◽  
Martin Tenniswood ◽  
Yves Valotaire
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Immature Female ◽  
External Appearance ◽  
Seasonal Regulation ◽  
Low Levels ◽  
Estrogen Stimulation ◽  
Different Levels ◽  
Estradiol Levels ◽  
Stimulation Of

The study of the seasonal regulation of vitellogenesis in rainbow trout (Salmo gairdneri) is hampered by two features of the system which are not seen in species such as Xenopus. First, it is impossible to sex immature trout by external appearance and, secondly, the quantitation of the very low levels of vitellogenin in previtellogenic serum is technically difficult and tedious. We describe the preparation of a specific, sensitive anti-vitellogenin antibody and the use of this antibody in a rocket immunoelectrophoresis system to measure serum vitellogenin. The sensitivity of the assay is such that, using only 2 μL of serum, it is possible to detect vitellogenin at levels of 10 μg/mL, making this assay extremely useful for selecting immature female trout for further studies on the basis of the presence of vitellogenin. Using this system we have also measured the response of individual male trout to stimulation with different levels of estradiol, and we have shown that it is possible to measure the stimulation of vitellogenin by estradiol levels equivalent to those seen during the previtellogenic phase of the reproductive cycle in females. This simple assay system thus alleviates two of the major hurdles in studying vitellogenesis in trout.

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