Digestibility and Utilization of Canola Meal in Practical-Type Diets for Rainbow Trout (Salmo gairdneri)

1986 ◽  
Vol 43 (6) ◽  
pp. 1149-1155 ◽  
Author(s):  
J. W. Hilton ◽  
S. J. Slinger
Keyword(s):  
Rainbow Trout ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Protein Digestibility ◽  
Salmo Gairdneri ◽  
Canola Meal ◽  
Feed Ingredient ◽  
High Fiber ◽  
Dry Matter Digestibility ◽  
High Level

The digestibility study indicated that dry matter digestibility of canola meal (CM) was low (56.2–60.4%), probably due to the high fiber content of this product and its relatively high level of complex carbohydrates. Energy and protein digestibility of CM were 72.4 and 83.2%, respectively, and the essential amino acid digestibilities were similar to those of protein in the CM. CM cannot successfully replace either soybean meal or fish meal in practical-type diets for young rainbow trout (Salmo gairdneri) without sacrificing growth. Supplementation with additional arginine, lysine and zinc, or energy to CM-based diets did not overcome the growth depressing effects. CM supplementation to the trout diet affected the thyroid gland of the fish, producing a diffuse, microfollicular hyperplasia that increased in severity with increasing CM supplementation. Young rainbow trout appear to be more sensitive to dietary glucosinolates than chinook salmon (Oncorhynchus tshawytscha), and total glucosinolate levels of 158 μg/g or more are deleterious to these fish. We conclude that CM should not, at this time, be included as a feed ingredient in commercial trout diets for young rainbow trout.

Potentiated Sulfonamide Therapy of Enteric Redmouth Disease

1983 ◽  
Vol 40 (1) ◽  
pp. 101-102 ◽  
Author(s):  
G. L. Bullock ◽  
G. Maestrone ◽  
C. Starliper ◽  
B. Schill
Keyword(s):  
Rainbow Trout ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Effective Control ◽  
Salmo Gairdneri ◽  
Artificial Infection

Effective control of enteric redmouth disease was obtained during artificial infection of rainbow trout (Salmo gairdneri) and in natural outbreaks in rainbow trout and chinook salmon (Oncorhynchus tshawytscha) with a potentiated sulfonamide, Ro5-O037, a combination of five parts sulfadimethoxine and one part ormetoprim. Treatment was given at the rate of 50 mg/kg of fish for 5 d.Key words: potentiated sulfonamide, enteric redmouth, therapy, salmonids

Some Factors in Susceptibility of Juvenile Rainbow Trout and Chinook Salmon to Chondrococcus columnaris

1971 ◽  
Vol 28 (11) ◽  
pp. 1739-1743 ◽  
Author(s):  
M. P. Fujihara ◽  
P. A. Olson ◽  
R. E. Nakatani
Keyword(s):  
Immune Response ◽  
Rainbow Trout ◽  
Water Temperature ◽  
River Water ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Response Times ◽  
Salmo Gairdneri ◽  
Subsequent Infection ◽  
Columnaris Disease

Susceptibility of juveniles of chinook salmon (Oncorhynchus tshawytscha) and rainbow trout (Salmo gairdneri) to Chondrococcus columnaris disease appeared to be influenced by age offish, crowding, and water temperature. Rainbow trout of about 1 g and chinook salmon of about 3 g were less susceptible than smaller fish, and tests with chinook salmon suggested that age was more important than weight. When chinook salmon averaging 4.3 g were exposed from July to October to the pathogen in river water, mortality ranged from 1.0% in a trough with 50 fish to 12% in one with 900. Mortality of rainbow trout averaging 2.4 g that were exposed to the pathogen in trough river water averaged 4.7–22% after 4 weeks, at temperatures from 17.2 to 17.8 C; the survivors, however, were generally resistant to subsequent infection, suggesting development of an immune response. Times to 100% mortality of sibling chinook salmon averaging 3.9 g that were exposed for 25 min to about 2.5 × 105 organisms per liter of sterile river water were about 19 hr at 10 C and 8 hr at 22 C. Survival of rainbow trout was higher when they were held at 2.2 degrees C below than when held at 2.2 degrees C above seasonal river temperatures.

Occurrence of the eyefluke, Diplostomum (Diplostomum) baeri bucculentum Dubois et Rausch, 1948, in salmonid fishes of northern British Columbia

1985 ◽  
Vol 63 (2) ◽  
pp. 396-399 ◽  
Author(s):  
Hilda Lei Ching
Keyword(s):  
Rainbow Trout ◽  
Chinook Salmon ◽  
Sockeye Salmon ◽  
Lake Trout ◽  
Infected Fish ◽  
Salmo Gairdneri ◽  
Coregonus Clupeaformis ◽  
Lake Whitefish ◽  
Dolly Varden Salvelinus Malma ◽  
Prosopium Williamsoni

As a result of experimental infections in chicks, diplostomula found in the retina of chinook salmon from the Nechako River were identified as Diplostomum (Diplostomum) baeri bucculentum. Eyeflukes in other salmonids were considered to be the same species based on similar measurements and site in the eyes. These eyeflukes varied in prevalence and mean intensity in seven salmonid species surveyed in nine localities in 1979–1981. The following fish were sampled: rainbow trout (Salmo gairdneri), 505; mountain whitefish (Prosopium williamsoni), 334; lake whitefish (Coregonus clupeaformis), 32; Dolly Varden (Salvelinus malma), 66; lake trout (S. namaycush), 13; kokanee or sockeye salmon (Oncorhynchus nerka), 323; and chinook salmon (O. tshawytscha), 164. Eyeflukes had prevalences ranging from 84 to 100% in six lakes, 64% in the river, 53% in one reservoir site, and a prevalence of 15% in the other reservoir site. Mountain and lake whitefishes had high mean intensities while kokanee had low mean intensities. Correlation of increased intensity with increased fish size was significant for 6 of 27 samples. Four samples of lake whitefish, mountain whitefish, rainbow trout, and chinook salmon showed significant asymmetry when numbers of diplostomula were compared between eyes. More of the heavily infected fish showed asymmetry than did the lightly infected fish.

The effects of domestication on the relative vulnerability of hatchery and wild origin spring Chinook salmon (Oncorhynchus tshawytscha) to predation

2007 ◽  
Vol 64 (5) ◽  
pp. 813-818 ◽  
Author(s):  
Anthony L Fritts ◽  
Jennifer L Scott ◽  
Todd N Pearsons
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Chinook Salmon ◽  
First Generation ◽  
Oncorhynchus Tshawytscha ◽  
State Of The Art ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Salmon Fry ◽  
History Of ◽  
Relative Vulnerability

We tested whether one generation of state-of-the-art hatchery culture influenced the vulnerability of Chinook salmon (Oncorhynchus tshawytscha) fry to predators. Size-matched hatchery and wild origin spring Chinook salmon fry were exposed to rainbow trout (Oncorhynchus mykiss) and torrent sculpin (Cottus rhotheus) predators in 10.8 m3 net pens. The hatchery origin fry were the offspring of first generation hatchery-reared broodstock, and the wild origin fry had no history of hatchery culture; both originated from the same stock. Wild origin fry were found to have a 2.2% (p = 0.016) survival advantage over hatchery origin fry during 2 years of predation challenges. The most important findings of this study are (i) domestication can affect the susceptibility to predators after only one generation of state-of-the-art hatchery culture practices, and (ii) the domestication effect was very small.

scholarly journals Consequences of Piscine orthoreovirus genotype 1 (PRV‐1) infections in Chinook salmon ( Oncorhynchus tshawytscha ), coho salmon ( O. kisutch ) and rainbow trout ( O. mykiss )

2020 ◽  
Vol 43 (7) ◽  
pp. 719-728 ◽  
Author(s):  
Maureen K. Purcell ◽  
Rachel L. Powers ◽  
Torunn Taksdal ◽  
Doug McKenney ◽  
Carla M. Conway ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Coho Salmon ◽  
Genotype 1
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