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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: International Aquatic Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Survival,Growth rate,Rainbow trout,Probiotic,carcass quality,Saccharomyces cerevisia
- چکیده:
- چکیده انگلیسی: The effect of Saccharomyces cerevisia var. elipsoidous as probiotic in the diet of rainbow trout Oncorhynchus mykiss fry was studied during 25 days after the first feeding in ratios of 1%, 5% and 10%. After 25 days there was no significant difference in the fry growth performance (P > 0.05). There was also no significant difference (P > 0.05) in the effect of the dietary yeast on mortality, condition factor (CF) and food conversion ratio (FCR). Also an experiment with only fish oil (without yeast) was done and all results were compared with the control group. The specific growth ratio (SGR), body weight increase (%BWG) and protein efficiency ratio (PER) were significantly higher in the 5% yeast diet compared to the control diet (P < 0.05). A significant increase in the lipid content of the carcass was observed with a probiotic in the diet. With increase of the yeast in the diet, the ash content of the carcass increased and the protein content decreased. The results of these experiments showed that the use of yeast as additive in the diet during the early life stage of the rainbow trout fry is suitable and it is probable that a 5% concentration of yeast in the diet will have the best results on the growth performance and the feed efficiency ratio.
- انتشار مقاله: 14-03-1399
- نویسندگان: Molook Pooramini,Abolghasem Kamali,Abdolmajid Hajimoradloo,Morteza Alizadeh,Rasoul Ghorbani
- مشاهده
- جایگاه : پژوهشی
- مجله: International Aquatic Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Beluga,gonad development,Steroid Hormones,Gonadic stage,brackish water
- چکیده:
- چکیده انگلیسی: The experiment was carried out in one year on blood sexual hormones in 74 four-years old beluga sturgeon Huso huso held in 8 round cement tanks in brackish water with salinity of about 13.5 ppt. Fishes were biopsied at the beginning of the experiment in order to determine the sexuality and gonadic stage. Blood sampling was performed in caudal veins three times during experiment in fall, winter and spring seasons.Testosterone (T), Esteradiol (E2) and Progesterone (P) were measured by Radio Immune Assay (RIA) method. Test of profile was done in duplicate. Statistical results showed a significant elevation (p < /em> > 0.05) on measured factors in both sexes, especially in males.In males, testosterone (T) depends on gonadic stage had significant elevation; but in females, there was no significant increase (p < /em> > 0.05) in estradiol (E2) and progesterone (P) which probably resulted from their ages. In males, T level in stages II, II-III, III, IV, were 5.5, 4.4, 6.3, 2.6 ng/ml, respectively.The result indicated that the amount of T increased by development of gonads until III stage, then suddenly decreased in stage IV. Quantities of P and E2 were measured only in females.Amounts of P and E2 in stages of II, II-III, were 0.12, 0.13 and 1.455, 0.81 ng/ml, respectively, suggesting the increase of P and decrease of E2 were associated with gonad progress. According to the results, it was demonstrated that sexual hormones were affected by season, environmental conditions and gonadal stages.Therefore, inland underground brackish water as a new medium culture was effective in reduction maturity time in beluga.
- انتشار مقاله: 26-08-1399
- نویسندگان: Morteza Alizadeh,Ali Akbar Hedayati,Mahmoud Bahmani,Hamid Reza Jamalzadeh
- مشاهده