INDUCED SPAWNING IN FEMALE RAINBOW TROUT ONCORHYNCHUS MYKISS BY GNRH ANALOG

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DORAFSHAN S.; MAJAZI AMIRI B.; PEYKAN HEYRATI F.; HAJEEZADEH A.; MOSTAFAVI H.

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Journal: Iranian Scientific Fisheries Journal Year:2002 | Volume:11 | Issue:3 Page(s): 23-38

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Title

INDUCED SPAWNING IN FEMALE RAINBOW TROUT ONCORHYNCHUS MYKISS BY GNRH ANALOG

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Keywords

INDUCED SPAWNINGQ4

OVULATIONQ4

TESTOSTERONQ4

GNRHAQ4

RAINBOW TROUTQ2

Abstract

The effect of a synthetic GNRHA on INDUCED SPAWNING of female RAINBOW TROUT broodstocks was examined. Some aspects of this experiment was sychronization and acceleratation of OVULATION and the other was the control of quantity and quality of eggs. The fish samples were divided into 5 groups of 10 specimen. Injection were done interperutal and the dosage of GNRHA were 20, 30, 60 and 80 g/kg of body weight. Group 1 as control sample only received propylene glycol as a vehicle of hormone. The use of GNRHA injection could accelerate and synchronous OVULATION and spawning in female RAINBOW TROUT, the mean time to OVULATION was reduced from 19.6±2.45 days in control to 11.56±2.25, 12.75±2.72, 7.56±0.29 and 9.5±o.98 days in groups 2 to 5, respectively (p<0.05). Also cumulative spawning rate was increased in hormonal groups; up to 8thday after first injection. The cumulative spawning rate was 47.0, 34.4, 90.0 and 56.3% in groups 2 to 5 respectively. Although, until this time none of the females in control group were spawned. In the end of experimental period (day 26), this rate was completed in group 2 to 5, but only 50% of females in control group was spawned. The mean weight of stripped eggs, egg diameter and mean survival rate to the eyed stage did not show any significant difference between experimental groups (p>0.05). TESTOSTERONe levels were increased from 9.21±4.11 at time 0 to 23.47±14.29 ng/ml at 24 h after first injection, and then reduced to the basal levels in all hormonal groups (except group 5) at 72 h after first injection (10.91±3.11ng/ml) (p<0.05). There wasn't observed any TESTOSTERON levels fluctuation in control group.

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APA: Copy

DORAFSHAN, S., MAJAZI AMIRI, B., PEYKAN HEYRATI, F., HAJEEZADEH, A., & MOSTAFAVI, H.. (2002). INDUCED SPAWNING IN FEMALE RAINBOW TROUT ONCORHYNCHUS MYKISS BY GNRH ANALOG. IRANIAN SCIENTIFIC FISHERIES JOURNAL, 11(3), 23-38. SID. https://sid.ir/paper/4624/en

Vancouver: Copy

DORAFSHAN S., MAJAZI AMIRI B., PEYKAN HEYRATI F., HAJEEZADEH A., MOSTAFAVI H.. INDUCED SPAWNING IN FEMALE RAINBOW TROUT ONCORHYNCHUS MYKISS BY GNRH ANALOG. IRANIAN SCIENTIFIC FISHERIES JOURNAL[Internet]. 2002;11(3):23-38. Available from: https://sid.ir/paper/4624/en

IEEE: Copy

S. DORAFSHAN, B. MAJAZI AMIRI, F. PEYKAN HEYRATI, A. HAJEEZADEH, and H. MOSTAFAVI, “INDUCED SPAWNING IN FEMALE RAINBOW TROUT ONCORHYNCHUS MYKISS BY GNRH ANALOG,” IRANIAN SCIENTIFIC FISHERIES JOURNAL, vol. 11, no. 3, pp. 23–38, 2002, [Online]. Available: https://sid.ir/paper/4624/en

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