Publication Date:
2021-07-16
Description:
This research was done in a trout farm in Kohkiloyeh and Boyer- Ahmad province. The main object of this study was comparing of two sources of astaxanthin (synthetic or algae) in feed on reproduction efficiency of rainbow trout and some indices of egg quality. Therefore, it was considered 7 groups consisting 6 treatments of two different astaxanthin sources and a control (without astaxanthin). So, algal astaxanthin (haematococcus pluvialis) in the three levels of 2.67, 3.55 and 8gr/kg food (T1,T2, T3) and synthetic source in three levels of 40, 80 and 120mg/kg food in diet (T4, T5, T6) examined on 140 trout broods (3-4 years) for 4 months, before the spawning season. Reproduction efficiency analyzed through reproduction indices such as egg diameter, fecundity, fertilization, survival, hatching and eyed egg rates. Significant difference between treatments in terms of fecundity, eyed eggs rate and the number of eggs per gram was observed (P 〈0.05). Although in some factors such as diameter, egg weight per body and fertilization rate, no significant differences was observed. By increasing level of astaxanthin in both sources of algal and synthetic, hatching and eyed egg rates increased, but the effect of alga source on these indices was more perfect. Considering the results, the best result related to treatment of 8 gr/kg alga (T3). Observations during this research indicated no disease and mortality and also proper coloration and freshness of fishes. There was significant differences on blood factors (P 〈0.05). The broods were fed with algal astaxanthin had lower blood sugar. concentration of cholesterol was decressed alog with increasing in both the source of astaxanthin, however lower cholesterol relaed to algal astaxanthin. Total serum protein increased in treatments containing algal from 2.67 to 8 g/kg of astaxanthin. Increase in level of astaxanthin from 40 to 80 mg/kg, albumin increased and from 80 to 120 mg/kg, it was decreased. The changes in serum globulin treatments containing synthetic was not regular. Overall the results asserted that the application of astaxanthin improves reproduction performance of rainbow trout. It also concluded that natural astaxanthin (Haematococcus pluvialis) for the reason that contains supplementary nutritious, is extraordinary preferable than synthetic astaxanthin to improve reproductions indices and egg quality of rainbow trout.
Keywords:
Aquaculture
;
Iran
;
Kohkiloyeh and Boyer- Ahmad province
;
Rainbow trout
;
Astaxanthin
;
Haematococcus pluvialis
;
Reproduction efficiency
;
Larval stage
;
Broods health
;
Synthetic
;
Algal astaxanthin
;
Growth
;
Oncorhynchus mykiss
;
Eggs
;
Spawning
;
Fecundity
;
Fertilization
Repository Name:
AquaDocs
Type:
monograph
Format:
application/pdf
Format:
application/pdf
Format:
81
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