Comparison of milt and blood parameters including testosterone and gonadotropins levels of sex‐reversed female rainbow trout ( Oncorhynchus mykiss ) by different steroid hormones

2020 ◽  
Author(s):  
Burak Evren İnanan ◽  
Ümit Acar
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Steroid Hormones ◽  
Blood Parameters ◽  
Rainbow Trout Oncorhynchus Mykiss

scholarly journals Cinnamon Promotes Growth Performance, Digestive Enzyme, Blood Parameters, and Antioxidant Activity of Rainbow Trout (Oncorhynchus mykiss) in Low-Carbohydrate Diets

2021 ◽  
Vol 21 (07) ◽  
pp. 309-322
Author(s):  
Mitra Ravardshiri ◽  
Somayeh Bahram ◽  
Seyed Rohollah Javadian ◽  
Masoumeh Bahrekazemi
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Digestive Enzyme ◽  
Density Lipoprotein ◽  
Blood Parameters ◽  
Control Group ◽  
Carbohydrate Diet ◽  
Low Carbohydrate Diet ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Low Carbohydrate

This study was conducted to investigate the effect of cinnamon in high- and low carbohydrate diets on the physiology of rainbow trout (Oncorhynchus mykiss (16.12±1.33 g). Six experimental diets including control/LCarb (200 g/kg carbohydrate), LCarb-3C (200 g/kg carbohydrate, 30 g/kg cinnamon), LCarb-5C (200g/kg carbohydrate, 50 g/kg cinnamon), HCarb (300 g/kg carbohydrate), HCarb-3C (300 g/kg carbohydrate, 30 g/kg cinnamon), and HCarb-5C (300 g/kg carbohydrate, 50 g/kg cinnamon) were formulated to feed fish for eight weeks. The results showed that fish fed dietary LCarb-3C (72.64 g) and LCarb-5C (73.17 g) had higher weight gain as compared with treatments without cinnamon (P<0.05). Blood performance in LCarb3C (67.10) was significantly higher than the HCarb-3C group (P<0.05). Fish fed dietary LCarb-3C had the best performance so that cinnamon in this group lowered glucose, total cholesterol, and low-density lipoprotein, improved total protein, and highdensity lipoprotein contents. Supplementation of this herb also improved protease and lipase in LCarb-3C and LCarb-5C groups as compared with control. Individuals fed supplemented diets but not HCarb had a higher superoxide dismutase activity when compared with the control group (P<0.05). Generally, cinnamon improved parameters in this study in fish fed a low-carbohydrate diet rather than a high-carbohydrate diet.

Behavioural and metabolic effects of chronic exposure to sublethal aluminum in acidic soft water in juvenile rainbow trout (Oncorhynchus mykiss)

1999 ◽  
Vol 56 (4) ◽  
pp. 670-678 ◽  
Author(s):  
C J Allin ◽  
R W Wilson
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Blood Parameters ◽  
Metabolic Effects ◽  
Swimming Behaviour ◽  
Feeding Rates ◽  
Aluminum Exposure ◽  
Juvenile Rainbow Trout ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Index Of Exposure

Triplicate groups of 15 softwater-acclimated juvenile rainbow trout (Oncorhynchus mykiss) were randomly allocated to one of three treatments: pH 6.5 with no aluminum, pH 5.2 with no aluminum, and pH 5.2 with 30 µg labile aluminum·L-1. The aluminum dose was sublethal and continued for 34 days. Treatment effects on swimming behaviour, metabolism, feeding, food conversion efficiency, and blood parameters were determined. Fish exposed to aluminum displayed hypoactivity that was statistically distinct from both control groups from day 1 onwards. Exposure to acid alone elicited no behavioural effects. There were no significant differences in metabolic rates between the treatment groups. Feeding rates of the fish exposed to aluminum became depressed, reaching a minimum on day 15, and gradually recovered thereafter, but never to the preexposure levels. Swimming behaviour was a more sensitive index of exposure to aluminum than feeding. Fish exposed to aluminum had significantly fewer red blood cells and lower haematocrit than the controls, indicating haemodilution. Aluminum is known to act as a respiratory toxicant, restricting aerobic scope. In addition, these data suggest that fish respond to aluminum exposure by reducing metabolically costly activities such as routine swimming behaviour to allow for the increased maintenance costs associated with acclimation and damage repair.

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