Abstract
In this study the microbiota of Clarias gariepinus tissues harvested from e-waste-soil polluted vials were assessed. Soil samples contaminated with e-waste were analyzed using standard analytical protocol while the microbial study was obtained using standard conventional microbiological techniques. The results revealed that the soil was sandy-loamy and blackish in colour. High organic matter (17.60%) and organic carbon (10.17%) were obtained. Also, higher calcium (182.00 mg/kg) and phosphorus (146.65 mg/kg) contents compared to other mineral constituents were recorded while, the heavy metals ranged from 0.32- 64.90 mg/kg. Bacterial count ranged from 9.0 × 102 to 4.0 × 103 cfu/L while the fungal count from 4.0 × 102 to 2.3 ×103 sfu/L. The genera of bacteria isolate were identified as Staphylococcus, Proteus, Bacillus, Listeria, Salmonella, Enterobacter, Pseudomonas, Lactobacillus and Corynebacterium and fungal isolates were Penicilliun, Candida, Articulospora, Aspergillus, Rhizopus, Mucor, Zoopage, Varcosporium and Rhodotorula. Microbial species richness of fish tissues from polluted vials indicates a more poly-diverse microbial community compared to those from unpolluted vial. Differences were observed in the occurrence of fungi on the surfaces of catfish tissues in control vial compare to those on fishes from polluted vials. Hence, there is a need for proper water management for fish culturing and caution in the exploration of fishes from polluted natural waters for human consumption. Key words: Clarias gariepinus, e-waste, fish tissues, microbiota, pollution, microbial species richness.  
Highlights
The United Nations Food and Agricultural Organization predicts that the world’s food and feed supply need to grow by 0.7-fold (70%) to sustain the increasing human populace by mid of century (Bruijn et al, 2018)
The bacterial counts from the harvested tissues were observed to be highest on the skin (3.7 × 103) and the gills (4.0 × 103) (Figure 1)
Bruijn et al (2018), reported fish skin typically harbors 102-104 bacteria per cm2, whereas the gills harbour 103-106 bacteria per gram of tissue based on fish species, environment and cultivation methods
Summary
The United Nations Food and Agricultural Organization predicts that the world’s food and feed supply need to grow by 0.7-fold (70%) to sustain the increasing human populace by mid of century (Bruijn et al, 2018). There is growing evidence that microbial consortia rather than single species are linked to fish well-being and diseases (Gilbert et al, 2016). Constituents within man’s gut microbiota can substantially promote or suppress disease progress (Gilbert et al, 2016), whereas ecological changes or infections can significantly influence man’s gut microbiota by promoting proliferation of opportunistic microbes (Stecher et al, 2013). Fish microbial flora may possess considerable potential to influences well-being and disease. Owing to the intricate composition of microbial communities, disentangling relationships and identifying species for precise functions is hugely challenging, when environmental impacts on population dynamics and processes are considered (Bruijn et al, 2018). Taxonomical or functional fluxes in the microbiota are fundamental factor for disease propagation or disease defense (Raaijmakers and Mazzola, 2016, Bruijn et al, 2018)
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