Dietary tetradecylthioacetic acid supplementation during the fall prevents an increase in body lipid levels but does not influence precocious male maturation rate in juvenile spring Chinook salmon

2021 ◽  
Author(s):  
Andrew L. Pierce ◽  
Lea R. Medeiros ◽  
Brian Hoffman ◽  
Ilana J. Koch ◽  
Shawn R. Narum ◽  
...  
1995 ◽  
Vol 31 (10) ◽  
pp. 219-223 ◽  
Author(s):  
M. Tomec ◽  
Z. Teskeredžic ◽  
E. Teskeredžic ◽  
M. Hacmanjek ◽  
E. McLean

Juvenile rainbow trout, Oncorhynchus mykiss, maintained under commercial conditions, were subjected to four different feeding regimes. Duplicate groups of fish were fed to satiation 3 times/d for either 7, 3, 2 or 1 d/wk over a 10 wk period. At the end of the trial, evaluations were made of group growth performance, body composition, and feed conversion efficiency (FCE). At the end of the experiment, no differences were discerned between fish fed either daily or 3 times/wk with respect to growth, FCE or body composition. Animals placed upon the two lowest rations were significantly smaller (P<0.05) than those fed daily and exhibited decreased condition factors and body lipid levels (P<0.05) and increased moisture content (P<0.05). Food conversion was least efficient in those fish provided the largest ration.


1979 ◽  
Vol 11 (6) ◽  
pp. 475-482 ◽  
Author(s):  
David Kritchevsky ◽  
David M. Klurfeld ◽  
Shirley A. Tepper ◽  
Maryanne A. Mueller ◽  
Lina Puglisi ◽  
...  

BMC Genomics ◽  
2012 ◽  
Vol 13 (1) ◽  
pp. 180 ◽  
Author(s):  
Fabian Grammes ◽  
Kjell-Arne Rørvik ◽  
Magny S Thomassen ◽  
Rolf K Berge ◽  
Harald Takle

Aquaculture ◽  
1999 ◽  
Vol 179 (1-4) ◽  
pp. 35-44 ◽  
Author(s):  
J.M Vergara ◽  
G López-Calero ◽  
L Robaina ◽  
M.J Caballero ◽  
D Montero ◽  
...  

Apidologie ◽  
2021 ◽  
Author(s):  
Vincent A Ricigliano ◽  
Kate E Ihle ◽  
Steven T Williams

AbstractWe tested the influence of genetic variation on responses to natural and artificial diets in Varroa-resistant Pol-line and Russian honey bee stocks. Newly emerged workers from six colonies per stock were fed pollen, spirulina (blue-green microalgae), and sucrose-only diets in 144 total cages. Diet type had a strong effect on sugar intake, body weight, fat body lipid content, and vitellogenin (vg) expression. Spirulina consumption was approximately half that of pollen, but led to higher head weights, equivalent thorax weights and vg levels, and marginally reduced fat body lipids. Bee stock and colony had a significant impact on nutritional response. Despite equivalent diet intakes, Pol-line bees accumulated higher lipid levels and consumed less sugar overall than Russian bees. Furthermore, pollen-fed bees sourced from Pol-line colonies had significantly higher vg levels. These differences in nutrient and energy allocation may reflect life history-related physiological tradeoffs. Our results suggest that genotype-dependent nutritional responses are present in honey bees, with promising implications for breeding efforts and tailored approaches to diet and health in a changing global climate.


2007 ◽  
Vol 64 (2) ◽  
pp. 256-271 ◽  
Author(s):  
Brian R Beckman ◽  
Brad Gadberry ◽  
Paul Parkins ◽  
Kathleen A Cooper ◽  
Kristen D Arkush

An experiment was performed to determine the relative effects of photoperiod at emergence and growth rate on smolting pattern and early male maturation rate in Sacramento River (California, USA) winter-run chinook salmon (Oncorhynchus tshawytscha) (listed as endangered under the US Endangered Species Act). Fry were ponded on the same day but at three different points in the seasonal photoperiod cycle (using artificial lighting) spanning the natural range of emergence timing in this population. Significant increases in gill Na+,K+-ATPase activity and seawater survival were found during March and April in all treatments, similar to yearling smolting patterns found in many salmonids. Fish that emerged early and grew at a relatively high rate also demonstrated signs of smolting in August–November. Male maturation was growth dependent, with HiFeed groups maturing at a rate double that found in LoFeed groups. Male maturation was also photoperiod dependent with a linear relation found between emergence date and rate of male maturation. These results demonstrate that individual life history pattern was variable and dependent on emergence timing and growth rate.


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