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<p>This study investigates the effects of combined anastrozole (AI) and 17α-methyltestosterone (MT) treatments on masculinization of commercially important ornamental fish <i>Trichogaster lalius</i>. Immersion treatments with varying doses of 500 AI + 500 MT, 700 AI + 300 MT, and 300 AI + 700 MT µg l<sup>−1</sup> were applied for 3&#xa0;h daily on the 3rd, 5th, and 8th days post-hatching. The results demonstrated that the treatments with 700 AI + 300 MT and 300 AI + 700 MT µg l<sup>−1</sup> resulted in 100% male populations, while 500 AI + 500 MT produced 85.38% males. Histological examination revealed atretic oocytes in treated groups, signifying the onset of sex reversal. Additionally, hormonal analysis showed significant alterations: testosterone levels increased, while estradiol levels decreased in treated groups compared to controls. Immersion treatment for 3&#xa0;h on the specified days post-hatching induced masculinization successfully in <i>T. lalius</i>, confirming the potential of combining AI and MT as a tool for sex manipulation in fish.</p>

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Induction of masculinization in Trichogaster lalius through combined anastrozole and 17α-methyltestosterone immersion treatment: Hormonal and histological insights

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • Milind B. Katare,
  • H. S. Mogalekar,
  • Sanjarambam Nirupama Chanu,
  • Mangesh M. Bhosale,
  • Manjulesh Pai,
  • Satyajit Belsare,
  • Prashant Telvekar,
  • Sandeep Gore

摘要

This study investigates the effects of combined anastrozole (AI) and 17α-methyltestosterone (MT) treatments on masculinization of commercially important ornamental fish Trichogaster lalius. Immersion treatments with varying doses of 500 AI + 500 MT, 700 AI + 300 MT, and 300 AI + 700 MT µg l−1 were applied for 3 h daily on the 3rd, 5th, and 8th days post-hatching. The results demonstrated that the treatments with 700 AI + 300 MT and 300 AI + 700 MT µg l−1 resulted in 100% male populations, while 500 AI + 500 MT produced 85.38% males. Histological examination revealed atretic oocytes in treated groups, signifying the onset of sex reversal. Additionally, hormonal analysis showed significant alterations: testosterone levels increased, while estradiol levels decreased in treated groups compared to controls. Immersion treatment for 3 h on the specified days post-hatching induced masculinization successfully in T. lalius, confirming the potential of combining AI and MT as a tool for sex manipulation in fish.