An experiment was conducted for 120 days to evaluate optimum dietary lipid requirements for gonadal maturation of Cyprinus carpio fed with varying dietary lipid levels under biofloc‐based systems (BFT). About 180 fingerlings (22 g ± 0.05) were randomly distributed in 15 tanks (300 L) at the rate of 48 no./m² and fed with varying lipid levels (T1—4% lipid with BFT, T2—6% lipid with BFT, T3—8% lipid with BFT, T4—10% lipid with BFT, control—10% lipid without BFT). The C/N ratio of 20:1 was maintained using tapioca flour as carbon source. Biofloc units supplemented with 8% dietary lipid (T3) showed advanced maturation in terms of absolute fecundity (9,913 ± 7.62), relative fecundity (229.0/g ± 11.92), gonadosomatic index (24.47% ± 1.27), hepatosomatic index (1.97% ± 0.07), condition factor (0.02 g/cm³ ± 0.00) compared with control (clear water with 10% lipid) (p < .05). Histological observations of gonads also revealed that the biofloc groups with supplementation of 8% dietary lipid promoted gonadal maturation for female oocyte and 6% dietary lipid promoted maturation for males, compared with control (clear water with 10% lipid). The results obtained in this experiment elucidate that the biofloc improves gonadal maturation of common carp broodstock at a dietary supplementation with 8% lipid compared with conventional system of broodstock management.

中文翻译：

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膳食脂质影响生物絮凝系统中养殖鲤鱼的性腺成熟，消化酶和血清生化指标

进行了为期120天的实验，以评估基于生物絮凝系统（BFT）饲喂不同日粮脂质水平的鲤鱼性腺成熟所需的最佳日粮脂质需求。将大约180种鱼种（22 g±0.05）以48 no./m ²的速率随机分布在15个水箱（300 L）中并饲喂不同的脂质水平（含BFT的T1-4％脂质，含BFT的T2-6％脂质，含BFT的T3--8％脂质，含BFT的T4--10％脂质，对照-不含BFT的10％脂质）。使用木薯粉作为碳源，C / N比保持在20：1。补充了8％饮食脂质（T3）的生物絮凝剂单位在绝对繁殖力（9,913±7.62），相对繁殖力（229.0 / g±11.92），性腺体指数（24.47％±1.27），肝体指数（1.97％±）方面表现出了高度成熟0.07），条件因子（0.02 g / cm ³  ±0.00）与对照（含10％脂质的清水）相比（p <.05）。性腺的组织学观察还显示，与对照（清水含10％脂质）相比，补充8％饮食脂质的生物絮凝剂组可促进雌性卵母细胞的性腺成熟，而6％饮食脂质可促进雄性卵母细胞的成熟。在该实验中获得的结果表明，与传统的亲鱼管理系统相比，在添加8％脂质的日粮中，生物絮凝剂可改善鲤鱼亲鱼的性腺成熟。