RNA/DNA ratios in white muscle as estimates of growth in rainbow trout held at different temperatures

1990 ◽  
Vol 68 (7) ◽  
pp. 1494-1498 ◽  
Author(s):  
Moira M. Ferguson ◽  
Roy G. Danzmann
Keyword(s):  
Growth Rate ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
White Muscle ◽  
Specific Growth ◽  
Fish Size ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Different Temperatures ◽  
Specific Growth Rates ◽  
Rna And Dna

The concentrations of RNA, DNA, and protein in white muscle from 240 uniquely tagged rainbow trout (Oncorhynchus mykiss) held at three temperatures (5, 8 (control), and 11 °C) were measured. Both RNA and RNA/DNA ratios were better predictors of recent length- and weight-specific growth rates than they were of absolute fish size. Furthermore, RNA concentrations were better predictors of growth than RNA/DNA ratios. The strength of the regression between either RNA/DNA ratio or RNA and growth rate did not differ consistently among temperatures. Fish reared at warmer temperatures had lower concentrations of RNA for both a given growth rate and a given DNA concentration compared with cold-reared trout. Warm-reared fish also had lower concentrations of DNA and higher protein/DNA ratios than cold-reared trout when fish size was standardized. The concomitant decrease in both RNA and DNA concentrations resulted in marginally lower RNA/DNA ratios in warm-reared fish.

Metabolic Effects of Bovine Growth Hormone and Genetically Engineered Rainbow Trout Growth Hormone in Rainbow Trout (Oncorhynchus mykiss) Reared at a High Temperature

1990 ◽  
Vol 47 (7) ◽  
pp. 1292-1301 ◽  
Author(s):  
Roy G. Danzmann ◽  
Glen J. Van Der Kraak ◽  
Thomas T. Chen ◽  
Dennis A. Powers
Keyword(s):  
Growth Hormone ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Growth Rates ◽  
Specific Growth ◽  
Genetically Engineered ◽  
Bovine Growth Hormone ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Treated Fish ◽  
Specific Growth Rates

The growth promoting ability of bovine growth hormone purified from natural sources (bGH) and genetically engineered rainbow trout growth hormone (rtGH) were compared in rainbow trout (Oncorhynchus mykiss) reared at 17.0 °C. Fish were fed high (on-demand feeding) and low (2.8–4.6% of body weight/d) rations. On both rations, length specific growth rates were significantly higher in bGH treated fish than in all other treatments. No significant differences in weight specific growth rates were detected between treatments. Testosterone levels in fish fed the high ration and treated with 1.0 μg/g rtGH or bGH were significantly elevated compared with controls as were 17-β-estradiol levels in females. bGH significantly reduced condition factors of low ration fish, and bGH and rtGH significantly depressed hepatosomatic indicies of high ration fish compared with controls. In a second experiment, weight and length specific growth rates were higher in rtGH and bGH injected fish than in saline controls but these differences were not significant. DNA standardized RNA levels were higher in rtGH and bGH treated fish than in saline control fish and these differences were significant in bGH treated fish. Results indicate that at high rearing temperatures GH administration does not have a major influence on growth but does stimulate steroidogenic and metabolic activity.

scholarly journals Introduce the Siberian Sturgeon (Acipenser baerii) to Turkish aquaculture industry: Duoculture possibility with Rainbow Trout

2019 ◽  
Vol 36 (3) ◽  
pp. 211-217
Author(s):  
Kübra Ak ◽  
İlker Zeki Kurtoğlu ◽  
Ramazan Serezli ◽  
Şevki Kayış ◽  
İlhan Yandı
Keyword(s):  
Growth Rate ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Specific Growth ◽  
Condition Factor ◽  
Siberian Sturgeon ◽  
Acipenser Baerii ◽  
Acipenser Baeri ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Aquaculture Industry

Duo culture response of Siberian sturgeon (Acipenser baeri) and rainbow trout (Oncorhynchus mykiss) was evaluated in culture tank conditions. Triplicated culture groups were planned as: mono-culture sturgeon (M, n=10), duo-culture sturgeon (DM, n=10) and duo-culture trout (DA, n=10), and mono-culture trout (A, n=10). Examination of mono and duo culture of each species, showed neither sturgeon nor trout, was indicated any significance on specific growth rate (SGR) and condition factor (CF). As for final biomasses among groups, no significant differences were recorded (p<0.05).

Effects of fish size and route of infection on virulence of a Danish Yersinia ruckeri O1 biotype 2 strain in rainbow trout (Oncorhynchus mykiss)

Aquaculture ◽  
2019 ◽  
Vol 503 ◽  
pp. 519-526 ◽  
Author(s):  
Maki Ohtani ◽  
Kasper Rømer Villumsen ◽  
Helene Kragelund Strøm ◽  
Anne Hjørngaard Lauritsen ◽  
Bent Aalbæk ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Yersinia Ruckeri ◽  
Fish Size ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Route Of Infection
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