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Information Journal Paper

Title

MORPHOLOGICAL STUDY OF GONADS OF RAINBOW TROUT (ONCORHYNCHUS MYKISS) AFTER ADMINISTRATION OF 17 -Α- METHYL TESTOSTERONE VIA FEED AND/OR IMMERSION

Pages

  91-99

Abstract

 Objective: To study the morphology of gonads and sperm ducts of sex reversed male RAINBOW TROUT after administration of 17- α - methyl testosterone.Animals: RAINBOW TROUT, ONCORHYNCHUS MYKISS.Procedure: 17-α-methyl testosterone (17- α -MT) was administered to RAINBOW TROUT in 5 treatments as follows: I) two times immersion of eyed eggs and yolk sac alevins in 250 μg/l bath with 2 hours duration and 8 days interval. II) Three times immersion of eyed eggs and yolk-sac alevins in 250 μg/l bath with 2 hours duration and 4 days intervals. III) two times immersion of eyed eggs and yolk sac alevins in 250 μg/l bath with 2 hours duration and 8 days interval plus oral administration of 3ppm 17- α -MT starting from active feeding of larvae for 90 days. IV) oral administration of 3ppm 17- α -MT starting from active feeding of larvae for 70 days. V) oral administration of 30ppm 17- α -MT starting from active feeding of larvae for 120 days. In addition, a control group was maintained with no hormonal treatment. 20 fishes from each treatment as well as control groups were examined morphologically for their reproductive organ sat the age of 24 months.Results: A range of normal to totally atrophic reproductive organs was observed in different treatment groups. Four types of sperm ducts were detected ranging from normal open-ended sperm ducts containing fluid semen, close ended sperm duct containing fluid semen, close-ended sperm duct lacking fluid semen, to close-ended atrophic sperm duct with no semen. The highest number of functional males with the ability of production of fluid sperm was found in treatment.Conclusion: 17- α - MT administration in an optimal dosage and route to female RAINBOW TROUT can produce functional males with the ability of normal sperm production although the gonads and sperm ducts may be affected morphologically.

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    APA: Copy

    TALA, M., AMINI, F., & FATEMI, SEYED MOHAMMAD REZA. (2006). MORPHOLOGICAL STUDY OF GONADS OF RAINBOW TROUT (ONCORHYNCHUS MYKISS) AFTER ADMINISTRATION OF 17 -Α- METHYL TESTOSTERONE VIA FEED AND/OR IMMERSION. JOURNAL OF VETERINARY RESEARCH, 61(1), 91-99. SID. https://sid.ir/paper/34832/en

    Vancouver: Copy

    TALA M., AMINI F., FATEMI SEYED MOHAMMAD REZA. MORPHOLOGICAL STUDY OF GONADS OF RAINBOW TROUT (ONCORHYNCHUS MYKISS) AFTER ADMINISTRATION OF 17 -Α- METHYL TESTOSTERONE VIA FEED AND/OR IMMERSION. JOURNAL OF VETERINARY RESEARCH[Internet]. 2006;61(1):91-99. Available from: https://sid.ir/paper/34832/en

    IEEE: Copy

    M. TALA, F. AMINI, and SEYED MOHAMMAD REZA FATEMI, “MORPHOLOGICAL STUDY OF GONADS OF RAINBOW TROUT (ONCORHYNCHUS MYKISS) AFTER ADMINISTRATION OF 17 -Α- METHYL TESTOSTERONE VIA FEED AND/OR IMMERSION,” JOURNAL OF VETERINARY RESEARCH, vol. 61, no. 1, pp. 91–99, 2006, [Online]. Available: https://sid.ir/paper/34832/en

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