Feeding behaviour of fast-and slow-growing strains of rainbow trout, Oncorhynchus mykiss (Walbaum), during first feeding

2001 ◽  
Vol 32 (10) ◽  
pp. 861-861
Author(s):  
L M P Valente ◽  
P Saglio ◽  
L M Cunha ◽  
B Fauconneau
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Feeding Behaviour ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
First Feeding ◽  
Slow Growing

Influence of Rainbow Trout (Oncothynchus mykiss) on Density and Feeding Behaviour of a Perlid Stonefly

1989 ◽  
Vol 46 (9) ◽  
pp. 1575-1580 ◽  
Author(s):  
Blair W. Feltmate ◽  
D. Dudley Williams
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Feeding Behaviour ◽  
Predator Avoidance ◽  
Feeding Rate ◽  
Avoidance Behaviour ◽  
Substrate Selection ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Paragnetina Media

Stonefly (Paragnetina media) density was reduced in a rainbow trout (Oncorhynchus mykiss) enclosure by approximately 35%, whereas in a trout exclosure no significant changes in density occurred. Of the 35% reduction, approximately two-fifths and three-fifths were attributable, respectively to direct consumption of stoneflies by trout, and emigration by stoneflies from the predator-stressed section of stream. With trout present in laboratory aquaria, predator avoidance behaviour resulted in stoneflies remaining significantly more on dark substrate on which they were less vulnerable to trout predators. Stoneflies consumed significantly fewer prey (enchytraeid whiteworms) over 24 h, in the presence of both small (2.0–4.0 cm) and large (10.0–12.0 cm) rainbow trout in aquaria, compared with stoneflies feeding in trout-free aquaria. Feeding rate and substrate selection did not differ between well-fed and starved (5 d) nymphs.

Antioxidant defense system is altered by dietary oxidized lipid in first-feeding rainbow trout (Oncorhynchus mykiss)

Aquaculture ◽  
2014 ◽  
Vol 424-425 ◽  
pp. 220-227 ◽  
Author(s):  
Stéphanie Fontagné-Dicharry ◽  
Emilie Lataillade ◽  
Anne Surget ◽  
Laurence Larroquet ◽  
Marianne Cluzeaud ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Antioxidant Defense ◽  
Antioxidant Defense System ◽  
Defense System ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
First Feeding

scholarly journals The development of the gut microbiota in rainbow trout (Oncorhynchus mykiss) is affected by first feeding and diet type

Aquaculture ◽  
2014 ◽  
Vol 424-425 ◽  
pp. 24-34 ◽  
Author(s):  
H.-C. Ingerslev ◽  
L. von Gersdorff Jørgensen ◽  
M. Lenz Strube ◽  
N. Larsen ◽  
I. Dalsgaard ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Gut Microbiota ◽  
Oncorhynchus Mykiss ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
First Feeding ◽  
Diet Type

Effects of different photoperiods on digestive enzyme activities in rainbow trout (Oncorhynchus mykiss) alevin and fry

2016 ◽  
Vol 94 (6) ◽  
pp. 435-442 ◽  
Author(s):  
Fereshteh Ramzanzadeh ◽  
Sakineh Yeganeh ◽  
Khosro JaniKhalili ◽  
Seyedeh Sedigheh Babaei
Keyword(s):  
Enzyme Activity ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Enzyme Activities ◽  
Digestive Enzyme ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
First Feeding ◽  
Significant Difference ◽  
Digestive Enzyme Activities ◽  
L 14

The aim of this study was to investigate the ontogeny of digestive enzymes and effects of photoperiod on pancreatic enzyme activity in rainbow trout (Oncorhynchus mykiss (Walbaum, 1792)) alevin and fry. After hatching, 3600 individuals of first-feeding alevin with a mean (±SD) mass of 119 ± 0.01 mg were reared in plastic tanks at four photoperiod levels (llight (L) : dark (D) cycle) for 6 weeks. Each replicate contained 300 alevin. Photoperiod treatments consisted of 14 h L : 10 h D, 10 h L : 14 h D, 4 h L : 20 h D, and 24 h L : 0 h D. During the rearing period, environmental variables including water temperature, oxygen, and pH were checked. Random sampling of alevin and fry was done at 0, 1, 3, 5, 8, 10, 15, 20, 25, 30, 39, and 44 days after the beginning of the first feeding (equal to 18, 19, 23, 25, 28, 30, 35, 40, 45, 50, 58, 63 days post hatching (dph)). The digestive enzyme activities in alevin and fry had a similar variation trend with age at all photoperiod levels. The specific activities of trypsin, chymotrypsin, and α-amylase at 24 h L : 0 h D were significantly higher than other treatments, but there was no significant difference in specific activity of lipase among treatments. The results demonstrated that growth, feeding efficiency, and digestive enzyme activity improved with longer exposure to photoperiod in rearing conditions.

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