treatment with the same extract resulted in no adverse effects in rat model. 8 Leaf extract from this plant was reported to exhibit high blood glucose-lowering effects, anti-nociceptive effect, ulcer healing effect, antioxidant effect, anti-inflammatory effect and anti-melanogenic effect. 9 However, to date, there is no available report on the anticholinesterase effect of the stem bark extract of this plant on the animal model. Therefore, the present study attempts to investigate the anticholinesterase effect of the stem bark extract of this plant on Catfish. Catfish also referred to as Pterygoplichthys is a large bony fish that is commonly found in Africa including Nigeria. 10 They are abundant in brackish water, freshwater, and saltwater and have been widely used in experimental research as the vertebrate animals for many years. 11 They are characterized by a moderate life cycle and life span with wide geographical range and availability. 12 The fish have been used as a suitable bio-indicator animal for the diagnosis of water pollutants caused by heavy metals due to their long-lived, reasonablly large size, and ability to adapt well to laboratory environment. 13 Moreover, this species is easy to be identified; they are known to have a fast growth rate and are easy to culture in the laboratory which make them an excellent research model. They are sensitive to toxicants and endocrine-disrupting chemicals at an early life stage. 14 Materials and Methods Plants collection and identification Ficus platyphylla stem bark was collected at Pharmacology garden city campus