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首页> 外文期刊>Fish Physiology and Biochemistry >Effects of partial or total fish meal replacement by agricultural by-product diets on gonad maturation, sex steroids and vitellogenin dynamics of African catfish (Clarias gariepinus)
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Effects of partial or total fish meal replacement by agricultural by-product diets on gonad maturation, sex steroids and vitellogenin dynamics of African catfish (Clarias gariepinus)

机译：农业副产品日粮替代部分或全部鱼粉对非洲cat鱼（Clarias gariepinus）性腺成熟，性类固醇和卵黄蛋白原动力学的影响

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摘要

The establishment of the first sexual maturation was characterized in African catfish (Clarias gariepinus) in order to study the efficiency of replacement of fish meal (FM) by diets composed of local vegetable ingredients. Four diets were formulated containing decreasing levels of FM (50–0% for diet 1 to diet 4) and increasing proportions of vegetable ingredients (50–100%). Gonadosomatic index (GSI), diameter and percentages of developmental stages of oocytes, plasma sex steroids and vitellogenin dynamics were investigated from February to June using one-year-old fish. Fish were individually tagged, and 12 individuals from each diet were investigated monthly. Replacement of FM with plant ingredients did not affect the GSI neither in males, nor in females. All males were spermiating, and no abnormal gonads were found. In females, GSI and percentages of advanced stages of oocytes decreased during the dry season, indicating seasonal changes in gonad development. Moreover, oocytes were in late exogenous vitellogenesis, but no final maturation stages were observed, whatever the diet. Higher plasma levels of E2 in females and of androgens (T and 11-KT) in both sexes were observed in fish fed diet 4 than in those receiving diet 1 depending on the season. Levels of plasma E2 and ALP (indicator for vitellogenin) in males did not differ among treatments and seasons suggesting no phytoestrogenic activity. The results showed that total replacement of FM by vegetable diets composed of groundnut oilcakes, bean and sunflower meals has no deleterious effect on the onset of sexual maturation in African catfish but, may stimulate the sex steroid production and in turns may potentially exert some positive actions on reproductive success.
机译：非洲sexual鱼（Clarias gariepinus）具有首次性成熟的特征，目的是研究用当地蔬菜成分组成的饮食替代鱼粉（FM）的效率。配制了四种饮食，它们的FM水平降低（饮食1到饮食4的50-0％）和蔬菜成分的比例增加（50-100％）。从2月到6月，使用一岁大的鱼类调查了性腺体能指数（GSI），卵母细胞的直径和发育阶段百分比，血浆性类固醇和卵黄蛋白原动力学。鱼被单独标记，每种饮食中的12个人每月进行调查。用植物成分替代FM不会影响男性和女性的GSI。所有男性都在生精，没有发现异常的性腺。在女性中，GSI和卵母细胞晚期阶段的百分比在干燥季节下降，表明性腺发育的季节性变化。此外，卵母细胞处于外源性卵黄形成后期，但无论饮食如何，均未观察到最终的成熟阶段。饲喂日粮4的鱼类中，女性的E2血浆水平和男女中的雄激素（T和11-KT）的血浆水平均高于接受饮食1的鱼类，具体取决于季节。男性之间血浆E2和ALP（卵黄蛋白原的指标）水平在治疗和季节之间没有差异，表明没有植物雌激素活性。结果表明，由花生油饼，豆类和向日葵粉组成的蔬菜饮食完全替代FM对非洲cat鱼的性成熟没有有害作用，但可能刺激性类固醇的产生，进而可能发挥某些积极作用繁殖成功。

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  • 来源
    《Fish Physiology and Biochemistry》 |2012年第5期|p.1287-1298|共12页
  • 作者

    L. Nyina-wamwiza; P. S. Defreyne; L. Ngendahayo; S. Milla; S. N. M. Mandiki; P. Kestemont;

  • 作者单位

    Research Unit in Environmental and Evolutionary Biology, The University of Namur, 61 rue de Bruxelles, 5000, Namur, Belgium;

    Research Unit in Environmental and Evolutionary Biology, The University of Namur, 61 rue de Bruxelles, 5000, Namur, Belgium;

    Laboratory of Anatomy and Pathology, National University of Rwanda, POB 117, Butare, Rwanda;

    Research Unit in Environmental and Evolutionary Biology, The University of Namur, 61 rue de Bruxelles, 5000, Namur, Belgium;

    Research Unit in Environmental and Evolutionary Biology, The University of Namur, 61 rue de Bruxelles, 5000, Namur, Belgium;

    Research Unit in Environmental and Evolutionary Biology, The University of Namur, 61 rue de Bruxelles, 5000, Namur, Belgium;

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  • 正文语种 eng
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  • 关键词

    Clarias gariepinus; Plant ingredients; Sex steroids; Vitellogenin; Gonad histology;

    机译：Clarias gariepinus;植物成分;性类固醇;卵黄蛋白原;性腺组织学;

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