Comparative impact of two phyto-piscicides viz. mahua (Bassia latifolia) oil cake (MOC) and castor (Ricinus communis L.) bean cake (CBC) upon the mineralizing heterotrophs was tested in outdoor experimental tanks. Following a sharp decline, aerobic heterotrophs and cellulose decomposing bacterial population recovered and the population density remained significantly higher than the pre-treatment level, indicating strong heterotrophic potential of both the phyto-piscicides in the culture system. Among the nutrient mineralizers, the sustained negative effect of both the piscicides was observed in denitrifying and ammonifying bacteria, whereas population of nitrifying and phosphate solubilizing bacteria was not affected. Because of narrower C: N ratio, CBC underwent faster decomposition thereby expressed it is manurial value quicker than MOC after exerting toxicity at the beginning. However, with distinctly higher N:P ratio CBC treatment might result in P limitation and toxicity when acting as manure in the culture system.

中文翻译：

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植物杀鱼剂、麻花 (Bassia latifolia) 油饼 (MOC) 和蓖麻 (Ricinus communis L.) 豆饼 (CBC) 对鱼类养殖系统矿化异养生物的影响

两种植物杀鱼剂的比较影响，即。麻花 ( Bassia latifolia ) 油饼 (MOC) 和蓖麻 ( Ricinus communisL.) 豆饼 (CBC) 在室外实验罐中对矿化异养生物进行了测试。在急剧下降后，好氧异养菌和纤维素分解菌种群恢复，种群密度仍显着高于处理前水平，表明两种植物杀鱼剂在培养体系中具有很强的异养潜力。在营养矿化剂中，在反硝化和氨化细菌中观察到两种杀鱼剂的持续负面影响，而硝化和溶磷细菌的种群不受影响。由于C:N比值较窄，CBC在开始发挥毒性后分解较快，比MOC更快地表现出粪便价值。但是，N 明显更高：