scholarly journals Modeling of the rainbow trout feeding in the cage complex of the «Russian Sea - Aquaculture» company

2020 ◽  
Vol 539 ◽  
pp. 012189
Author(s):  
A Beloborodov ◽  
E Minchenok
Keyword(s):  
Rainbow Trout ◽  
Cage Complex ◽  
Trout Feeding

Rainbow Trout (Salmo gairdneri) and Cutthroat Trout (S. clarki) Interactions in Coastal British Columbia Lakes

1981 ◽  
Vol 38 (10) ◽  
pp. 1228-1246 ◽  
Author(s):  
Nils-Arvid Nilsson ◽  
Thomas G. Northcote
Keyword(s):  
Rainbow Trout ◽  
Aggressive Behavior ◽  
Prey Capture ◽  
Cutthroat Trout ◽  
Maximum Size ◽  
Salmo Gairdneri ◽  
Sympatric Populations ◽  
Food Size ◽  
Coastal British Columbia ◽  
Trout Feeding

Food, size, and growth of 17 allopatric and 10 sympatric lake populations of rainbow trout (Salmo gairdneri) and cutthroat trout (S. clarki) were compared as well as their aggressive behavior during feeding in experimental tanks. In allopatry, rainbow trout fed extensively on benthic, midwater, and surface prey. Allopatric cutthroat utilized mostly midwater prey but in contrast with rainbow trout also fish (Cottus, Gasterosteus) when available. In sympatry, rainbow trout exploited mainly limnetic surface and midwater prey whereas cutthroat trout utilized more littoral prey and were much more piscivorous in feeding. Allopatric rainbow attained a greater average and maximum size (length, weight) than allopatric cutthroat whereas in sympatric populations cutthroat were clearly larger than rainbow. Growth (size at specific ages) usually was higher for rainbow compared with cutthroat trout in allopatric populations but just the reverse in sympatric populations. When held as matched pairs in aquaria, rainbow consistently were more aggressive than cutthroat trout and displayed different patterns of threat as well as means of prey capture. Differences in feeding and growth in sympatry may result from interactive segregation, the more pronounced aggressiveness of rainbow promoting higher growth in cutthroat trout.Key words: rainbow trout, cutthroat trout, feeding, growth, habitat, aggressive behavior, feeding behavior, interactive segregation

Seasonal change in the gastric evacuation rate of rainbow trout feeding on natural prey

2007 ◽  
Vol 71 (6) ◽  
pp. 1873-1878 ◽  
Author(s):  
Y. Kawaguchi ◽  
H. Miyasaka ◽  
M. Genkai-Kato ◽  
Y. Taniguchi ◽  
S. Nakano
Keyword(s):  
Rainbow Trout ◽  
Seasonal Change ◽  
Gastric Evacuation ◽  
Natural Prey ◽  
Evacuation Rate ◽  
Gastric Evacuation Rate ◽  
Trout Feeding

scholarly journals Use of rice protein concentrate in rainbow trout feeding: preliminary results

2005 ◽  
Vol 4 (sup2) ◽  
pp. 591-593
Author(s):  
L. Gasco ◽  
G.B. Palmegiano ◽  
F. Gai ◽  
F. Daprà ◽  
B. Sicuro ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Protein Concentrate ◽  
Rice Protein ◽  
Preliminary Results ◽  
Trout Feeding

Extraction, Quantification, and Biological Availability of Fumonisin B1 Incorporated into the Oregon Test Diet and Fed to Rainbow Trout†

1998 ◽  
Vol 61 (8) ◽  
pp. 1034-1038 ◽  
Author(s):  
FILMORE I. MEREDITH ◽  
RONALD T. RILEY ◽  
CHARLES W. BACON ◽  
DAVID E. WILLIAMS ◽  
DAVID B. CARLSON
Keyword(s):  
Rainbow Trout ◽  
Chromatographic Analysis ◽  
Liver Toxicity ◽  
Fumonisin B1 ◽  
Biologically Active ◽  
Test Diet ◽  
High Pressure Liquid Chromatographic ◽  
Liquid Chromatographic Analysis ◽  
Liquid Chromatographic ◽  
Trout Feeding

The purpose of this study was (i) to determine whether pure fumonisin B1 could be incorporated into, recovered, and detected by high-pressure liquid chromatographic analysis from the semipurified Oregon test diet (OTD) used in rainbow trout feeding studies, and (ii) to determine if the incorporated fumonisin B1 was biologically available using the change in free sphingoid bases in liver, kidney, and serum as a mechanism-based biomarker. The results indicate that fumonisin is not easily quantified in the OTD. Recoveries ranged from 12 to 81% of the calculated concentrations based on the fumonisin B1 added to the OTD. However, the fumonisin B1 in the OTD was readily absorbed and biologically active as evidenced by marked increases in free sphinganine in liver, kidney, and serum. The magnitude of the increase in free sphinganine at 100 ppm in the OTD was comparable to that known to be associated with liver toxicity in rats, pigs, and ponies.

The essential oils of some medicinal plants on the immune system of rainbow trout (Oncorhynchus mykiss)

Planta Medica ◽  
2012 ◽  
Vol 78 (11) ◽  
Author(s):  
A Ghasemi Pirbalouti ◽  
E Pirali ◽  
G Pishkar ◽  
S Mohammadali Jalali ◽  
M Reyesi ◽  
...  
Keyword(s):  
Immune System ◽  
Rainbow Trout ◽  
Medicinal Plants ◽  
Oncorhynchus Mykiss ◽  
Essential Oils ◽  
Rainbow Trout Oncorhynchus Mykiss

Swim bladder mycosis in farmed rainbow trout Oncorhynchus mykiss caused by Phoma herbarum and experimental verification of pathogenicity

2020 ◽  
Vol 138 ◽  
pp. 237-246 ◽  
Author(s):  
J Řehulka ◽  
A Kubátová ◽  
V Hubka
Keyword(s):  
Rainbow Trout ◽  
Histopathological Examination ◽  
Periodic Acid ◽  
Bladder Wall ◽  
Swim Bladder ◽  
Cell Reactivity ◽  
Periodic Acid Schiff ◽  
Posterior Portion ◽  
Hepatic Congestion ◽  
Phoma Herbarum

In this study, spontaneous swim bladder mycosis was documented in a farmed fingerling rainbow trout from a raceway culture system. At necropsy, the gross lesions included a thickened swim bladder wall, and the posterior portion of the swim bladder was enlarged due to massive hyperplasia of muscle. A microscopic wet mount examination of the swim bladder contents revealed abundant septate hyphae, and histopathological examination showed periodic acid-Schiff-positive mycelia in the lumen and wall of the swim bladder. Histopathological examination of the thickened posterior swim bladder revealed muscle hyperplasia with expansion by inflammatory cells. The causative agent was identified as Phoma herbarum through morphological analysis and DNA sequencing. The disease was reproduced in rainbow trout fingerlings using intraperitoneal injection of a spore suspension. Necropsy in dead and moribund fish revealed extensive congestion and haemorrhages in the serosa of visceral organs and in liver and abdominal serosanguinous fluid. Histopathological examination showed severe hepatic congestion, sinusoidal dilatation, Kupffer cell reactivity, leukostasis and degenerative changes. Fungi were disseminated to the liver, pyloric caeca, kidney, spleen and heart. Although infections caused by Phoma spp. have been repeatedly reported in fish, species identification has been hampered by extensive taxonomic changes. The results of this study confirmed the pathogenicity of P. herbarum in salmonids by using a reliably identified strain during experimental fish infection and provides new knowledge regarding the course of infection.

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