Monocrotophos (MCP) is one of the organophosphate pesticides extensively used in agriculture and animal husbandry. The present study reports the effects of sub‐lethal concentrations of MCP on gonadosomatic index (GSI), gonadal histology and breeding fitness of the fish Anabas testudineus. The fish were exposed to three sub‐lethal concentrations of monocrotophos (T1: 3.5 mg/L, T2: 5.3 mg/L and T3: 10.6 mg/L) for 45 days with 12 fish (males and females in equal numbers) in each tank, and one group was kept as control (C) without any treatment. GSI decreased in all treatment groups in comparison with control. Significant decrease in fertilization and hatching rate was observed at all concentrations in comparison with control on 15, 30 and 45 days of monocrotophos exposure. The decreased vitellogenesis, disruption of follicular wall and oocyte atresia were observed in all the treated females at 30 and 45 days of exposure. Rupture of seminiferous tubules was noticed in all the treated males irrespective of exposure periods. The results thus indicated that monocrotophos could deleteriously impact the gonadal structure and function in A. testudineus, which could seriously impact the reproductive success of the animal.

中文翻译：

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暴露于致命的久效磷浓度下的攀登鲈Anabas testudineus的卵巢和睾丸变化以及繁殖适应度（Bloch，1792）

久效磷（MCP）是广泛用于农业和畜牧业的有机磷酸盐农药之一。本研究报告了亚致死浓度的MCP对鱼类Anabas testudineus的性腺体指数（GSI），性腺组织学和繁殖适应性的影响。将鱼暴露于三种亚致死浓度的久效磷（T1：3.5 mg / L，T2：5.3 mg / L和T3：10.6 mg / L），持续45天，每条中有12条鱼（雄性和雌性数量相等）储罐，一组未经任何处理作为对照（C）。与对照组相比，所有治疗组的GSI均降低。在久效磷暴露的第15、30和45天，与对照相比，在所有浓度下观察到的施肥和孵化率显着降低。在暴露的30和45天，在所有接受治疗的雌性中观察到卵黄发生减少，卵泡壁破坏和卵母细胞闭锁。不论暴露时间长短，在所有接受治疗的男性中均发现有曲细精管破裂。结果表明久效磷可能会对性腺的性腺结构和功能产生有害影响。睾丸曲霉会严重影响动物的繁殖成功。