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Over last several decades, botanical extracts have been shown much interest in aquaculture to control fish parasites, fish fry predators and unwanted fishes from aquaculture ponds as attempts to replace chemical pesticides and piscicides, since extensive and indiscriminate use of these non-biodegradable synthetic chemicals results in harmful impact on aquatic environment and presents high risk to the non-targeted organisms (Das, 2013). Plant extracts are considered promising agents because of their eco-friendliness, ease of availability, high efficiency, rapid biodegradability and reduced toxicity to non-targeted animals (Yunis Aguinaga et al, 2014). To date, a good number of plants have been investigated in different countries to evaluate their pesticidal (Miresmailli and Isman, 2014) and piscicidal activities (Murthy et al, 2010; Akinsanya, 2016a; Akinsanya, 2016b). However, commercially available plant products are still limited, and hence, efforts should be made to find out new sources of botanical pesticides and piscicides for rapidly growing pisciculture (Ramanujam and Ratha, 2008). Plant extracts are referred to piscicides if they exert toxicological effects on fishes and cause death to these aquatic animals (Burkill, 1995). Plant piscicides are obtained from a variety of plants belonging to different families and species that may vary considerably not only for their taxonomic variations but also for the plant parts used (leaves, ARTICLE INFO ABSTRACT Article History: Received: Jan. 23, 2020 Accepted: April 29, 2020 Online: May 2020

egyptian journal of aquatic biology and fisheries

Hematological variations, histopathology and reversibility of liver function enzymes in post-juvenile Clarias gariepinus exposed singly to five botanical piscicides.