1. Udofia, U.U. A.B. Andem and M.A. Antia, 2019. Effect of industrial effluents on the population dynamics and distribution of benthic macro-invertebrates of new Calabar River, Southern Nigeria. Int. J. Biol. Sci. Res., 2: 19-27.
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2. Nneji, L.M., A.C. Adeola, A. Okeyoyin, A.B. Onadeko, E.A. Eniang, A.O. Adeyi and O.A. Ugwumba, 2019. First record of Foulassi Screeching Frog, Arthroleptis adelphus (Perret, 1966)(Anura, Arthroleptidae, Arthroleptinae), from Nigeria, with notes on its phylogenetic position. Check List, J. Biodivers. Data, 15: 253-259.
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3. Ibor, O.R., G. Eni, A.B. Andem, I.U. Idiong, O.E. Bamidele, A.O. Adeogun and A. Arukwe, 2019. Hepatic and gonado-histopathological alterations, modulations in biochemical enzymes and steroid hormones levels in Clarias gariepinus exposed to environmentally relevant concentrations of a synthetic pyrethroid (deltamethrin). Environ. Technol., 30: 1453-1460.
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4. Andem, A.B., K.A. Okorafor, U.U. Udofia and E.E. Oku, 2019. Seasonal variation in limnological characteristics of the upper, middle and lower reaches of Calabar River, Southern Nigeria. Int. J. Biol. Sci. Res., 2: 29-40.
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5. Andem, A.B., I.U. Bassey, C.O. Odey, O.R. Ibor and I.O. Agborubere, 2019. Microbial remediation of used engine oil from contaminated soil around automobile workshop in calabar metropolis, cross river state, Nigeria. Asian Soil Res. J., 2: 1-12.
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6. Oku, E.E., A.B. Andem, G.A. Paul and B.E. Job, 2018. Biological association of the blue crab (Callinectes amnicola: De Rochebrune, 1883) with invertebrate organisms in the Great Kwa River, Southeastern Nigeria. Int. J. Fish. Aqua. Stud., 6: 103-107.
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7. Odey, M.O., O.R. Ibor, A.B. Andem, I. Ettah and A.V. Chukwuka, 2018. Drinking water quality and risk implications for community health: A case study of shallow water wells and boreholes in three major communities in Northern Cross-River, Southern Nigeria. Hum. Ecol. Risk Assess.: An Intern. J., 24: 427-444.
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8. Joseph, A., E. Antai, A. Bassey and F. Okoro, 2017. Evaluation of the abiotic accumulation factor of some heavy metals in muscles of Clarias gariepinus from Qua Iboe river, South-eastern Nigeria. Int. J. Zool. Stud., 2: 29-38.
9. Ibor, O.R. E. George, A.B. Andem, A. Joseph and A.V. Chukwuka, 2017. Sexual dimorphic differences in Sarotherodon melanotheron and Hemichromis fasciatus from Great Kwa River, Calabar, Nigeria. Croatian J. Fish., 75: 85-100.
10. Ettah, I., O. Ibor, A. Bassey, J. Akaninyene and N. Christopher, 2017. Toxicity and histological effects of two liquid soaps on african mud catfish (Clarias gariepinus, Buchell, 1822) Fingerlings. Asian J. Environ. Ecol., 3: 1-9.
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11. Ettah, I., A. Bassey, O. Ibor, J. Akaninyene and N. Christopher, 2017. Toxicological and histopathological responses of African clariid mud catfish, clarias gariepinus (Buchell, 1822) fingerlings expose to detergents (Zip and Omo). Annu. Res. Rev. Biol., 13: 1-9.
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12. Esenowo, I.K., A.A.A. Ugwumba, I.I. Umoh and A.B. Andem, 2017. Aspects of the Biology of Silver Catfish (Chrysichthys nigrodigitatus) in Nwaniba River, Southeast Nigeria. Asian J. Biol., 3: 1-9.
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13. Antai, E., A. Joseph, A. Bassey and F. Okoro, 2017. The influence of size and seasons on the bio-accumulation of heavy metals in tissues of clarias gariepinus from Qua Iboe river, Southeastern Nigeria. Int. J. Zool. Stud., 2: 20-28.
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14. Akpang, I.E., J.A. Paul, A.A. Bassey, O.B. Esio and E.S. Ekpe, 2017. Evaluation of emerging threats of contaminants in boreholes along Ikot effanga dumpsite, calabar municipality, Nigeria. Arch. Curr. Res. Int., 9: 1-12.
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15. Akpang, I.E., A.A. Bassey, J.A. Paul and N.E. Sarah, 2017. Toxicological effects of different concentrations of hypo bleach on the mortality of African clariid mud catfish (Clarias gariepinus) Fingerlings. Asian J. Biol., 4: 1-7.
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16. Uyom, U.U., A.E. Eyo, J.A. Paul and A.A. Bassey, 2016. Variances in the accumulation of some heavy metals in water, Sediments and Muscles of Clarias gariepinus with respect to Seasons in Qua Iboe River, Southeastern Nigeria. Int. J. Res. Sci. Publ., 1: 110-120.
17. Joseph, A.P., V.O. Eyo and A.B. Andem and J.U. Idung, 2016. Assessment of some heavy metals in the tissues (gills, liver and muscle) of clarias gariepinus from Calabar River, Cross River State, South-eastern Nigeria. J. Coastal Life Med., 4: 430-434.
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18. Joseph, A.P., U.U. Udofia, A.B. Andem and J.U. Idung, 2016. Evaluation of the sediment quality using geo-accumulation Strategy in Qua Iboe River, Southeastern Nigeria. Int. J. Res. Sci. Publ., 1: 101-109.
19. Joseph, A.P., A.B. Andem and V.O. Eyo, 2016. Effects of some preservation method on the nutritional quality of Clarias gariepinus from Calabar River, South-Eastern Nigeria. J. Nat. Biol., 6: 8-15.
20. Andem, A.B., S.B. Ekanem and E.E. Oku, 2016. Environmental variables and ecological distribution of ichthyofauna assemblages in the Calabar River, Nigeria: Present and future prospects. Croatian J. Fish., 74: 159-171.
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21. Andem, A.B., O.R. Ibor, A.P. Joseph, V.O. Eyo and A.A. Edet, 2016. Toxicological evaluation and histopathological changes of synthetic pyrethroid pesticide (Cypermethrin) exposed to African Clariid mud Cat fish (Clarias gariepinus) fingerlings. Int. J. Toxicol. Pharmacol. Res., 8: 360-367.
22. Andem, A.B., A.P. Joseph, O.R. Ibor and E.R. John, 2016. Ichthyotoxic assessment of methanolic extract of Raphia hookeri exposed to different concentrations of African Clariid mud catfish (Clarias gariepinus) fingerlings. Int. J. Toxicol. Pharmacol. Res., 8: 341-345.
23. Udofia, U.U., A.B. Andem and C.O. Odey, 2015. Index model approach of heavy metals pollution assessment in sediment quality of Okporku River, Yala, Cross River State Nigeria. J. Bio. Pesticides Environ., 2: 12-20.
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24. Okorafor, K.A., A.B. Andem and D.P. Etim, 2015. Determination of metals and total hydrocarbon concentrations in five commercially important dry fishes available in Marian Market, Calabar, Nigeria. J. Basic Appl. Res. Int., 3: 134-144.
25. Okorafor, K.A., A.B. Andem and D.I. Arira, 2015. Concentrations of metals in the flesh (muscles) of five commercially important fishes obtained from the Great Kwa River, Nigeria. J. Basic Appl. Res. Int., 3: 47-53.
26. Andem, A.B., K.A. Okorafor, E.E. Oku and A.A. Ugwumba, 2015. Evaluation and characterization of trace metals contamination in the surface sediment using pollution load index (PLI) and Geo-Accumulation Index (Igeo) Of Ona River, Western Nigeria. Int. J. Sci. Technol. Res., 4: 29-34.
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27. Andem, A.B., K.A. Okorafor and S.B. Ekanem, 2015. Factor analysis and physico-chemical characteristics of Calabar River, southern Nigeria. Int. J. Sci.Technol. Res., 4: 25-28.
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28. Andem, A.B., K.A. Okorafor and E.R. Ekpenyong, 2015. Impact of saw-mill wood wastes and agrochemicals on the population structure of benthic macro-invertebrates of Afi River, Southern Nigeria. J. Bio. pesticides Environ., 1: 26-34.
29. Andem, A.B., I.K. Esenowo, O.R. Ibor and A. Abosi, 2015. Toxicological effects of formaldehyde concentrations on African Cat fish, Clarias gariepinus fingerlings. Int. J. Fish. Aquatic Stud., 2: 75-79.
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30. Andem, A.B., I.K. Esenowo and D.O. Bassey, 2015. Application of biotic indices and pollution tolerance index in assessing macro-invertebrate assemblage of ediba river, cross river state, Nigeria. J. Environ. Anal. Toxicol., 10.4172/2161-0525.S7-007.
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31. Oku, E.E., A.B. Andem, B.G. Arong and E. Odjadjare, 2014. Effect of water quality on the distribution of aquatic entomofauna of Great Kwa River, Southern Nigeria. Am. J. Eng. Res., 3: 265-270.
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32. Okorafor, K.A., A.B. Andem and U.E. Inyang, 2014. Some physico-chemical and bacteriological characteristics of soil samples around calabar metropolis, cross river state, Nigeria. American J. Eng. Res., 3: 166-172.
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33. Eni, E.G., A.B. Andem, E.E. Oku, C.J. Umoh and O.E. Ajah, 2014. Seasonal distribution, abundance and diversity of soil arthropods in farmlands around workshops in Calabar Metropolis, Southern Nigeria. J. Acad. Ind. Res., 2: 446-452.
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34. Eni, E.G., A.B. Andem, E.O. Effanga, C.J. Umoh, E.E. Oku and E.O. Ogbeche, 2014. Prevalence of yellow fever vectors in the forested area of bekwarra, Southern Nigeria. J. Acad. Indus. Res., 2: 472-475.
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35. Eni, E.G., A.B. Andem and G.U. Ushie, 2014. A preliminary checklists on planktons dynamics of calabar river, Southern Nigeria. Int. J. Sci. Technol., 2: 77-81.
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36. Andem, A.B. and P.B. Ekpo, 2014. Proximate and mineral compositions of mudskipper fish (Periophthalmus babarus) in the mangrove swamp of Calabar River, Southern Nigeria. Int. J. Sci. Technol., 2: 72-76.
37. Udofia, U.U., A.B. Andem and K.A. Okorafor, 2013. Acute toxic effect of qua iboe light crude oil on tadpoles of frog, Rana temporaria from Eket, Akwa Ibom State, Nigeria. Eur. J. Exp. Biol., 3: 701-705.
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38. Oku, E.E., A.B. Andem, G.E. Eni and B.K. Effiong, 2013. Arthropods community of mangrove swamp of great Kwa River, Southern, Nigeria. Int. J. Fish. Aqua. Stud., 1: 15-20.
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39. Okorafor, K.A., E.O. Effanga, A.B. Andem, U.U. George and D.I. Amos, 2013. Spatial variation in physical and chemical parameters and macro-invertebrates in the intertidal regions of Calabar River, Nigeria. Greener J. Geol. Earth Sci., 1: 63-72.
40. Okorafor, K.A., A.B. Andem, D.A. Mowang and U.U. Akpan, 2013. Diversity and spatial distribution of zooplankton in the intertidal regions of Calabar River, Cross River State. Niger. Adv. Appl. Sci. Res., 4: 224-231.
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41. Idung, J., B. Andem, G. Eni and U. George, 2013. Food and feeding habits of the brackish river prawn (Macrobrachium macrobrachion, Herklots, 1857) from Great Kwa River, Obufa Esuk Beach, Calabar, Cross River State, Nigeria. J. Nat. Sci. Res., 3: 82-87.
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42. George, U.U., J.U. Idung, A.B. Andem, K.A. Okorafor and D. Mowang, 2013. Diet composition and condition factor of Ethmalosa fimbriata in the cross river estuary. Greener J. Biol. Sci., 3: 244-252.
43. George, U., F. Asuquo, J. Idung and A. Andem, 2013. Effect of lethal concentrations of rubber extract (Hevea brasiliensis) on the survival on fingerlings of Clarias gariepinus under laboratory condition. J. Nat. Sci. Res., 3: 56-60.
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44. George, U., F. Asuquo, J. Idung and A. Andem, 2013. Bioaccumulation of heavy metals in three fresh water fishes caught from Cross River system. Eur. J. Exp. Biol., 3: 576-582.
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45. George, U., F. Asuquo, J. Idung and A. Andem, 2013. A laboratory bioassay of the potential effect of rubber extract (Hevea brasiliensis) on the survival of fingerlings of Oreochromis niloticus. J. Biol., Agri. Healthcare, 3: 70-74.
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46. George, E., A. Bassey, I. Joseph and G. Ubong, 2013. The fecundity of brackish river prawn (Macrobrachium macrobrachion, Herklots, 1851) from great kwa river, obufa esuk beach, calabar, cross river State, Nigeria. J. Biol., Agri. Healthcare, 3: 75-82.
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47. Eyo, V.O., B.A. Andem and P.B. Ekpo, 2013. Ecology and Diversity of Zooplankton in the Great Kwa River, Cross River State, Nigeria. Int. J. Sci. Res., 2: 67-71.
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48. Eyo, V.O., A.G. Udoh, S.E. Etta, P.B. Ekpo and A.B. Andem, 2013. Fecundity and gonadal development of the Frillfin goby, Bathygobius soporator (Valenciennes, 1837) from the Cross River estuary, Nigeria. Int. J. Sci. Res. Manage., 1: 476-480.
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49. Eyo, V.O., A.B. Andem, P.B. Ekpo, 2013. Ecology and diversity of phytoplankton in the great Kwa river, Cross River State, Nigeria. Int. J. Fish. Aqua. Stud., 1: 1-7.
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50. Andem, B.A., 2013. Effect of different feed application rates on growth performance and body composition of African catfish, Clarias gariepinus fingerlings. Int. J. Sci. Res. Manage. Stud., 1: 471-475.
51. Andem, A.B., U.U. Udofia, K.A. Okorafor and U.U. George, 2013. Bio-accumulation of some heavy metals and total Hydrocarbon (THC) in the Tissues of Periwinkle (Tympanotonus fuscatus Var Radula) in the intertidal regions of Qua Iboe River Basin, Ibeno, Akwa Ibom State, Nigeria. Greener J. Biol. Sci., 3: 253-257.
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52. Andem, A.B., U.U. George and V.O. Eyo, 2013. Length Frequency Distribution of (Chrysichthys nigrodigitatus) (Lecepede, 1803) (Chrysichthys, Bagridae) from Itu Head Brigde. Int. J. Sci. Res., 2: 258-260.
53. Andem, A.B., R.B. Agbor and I.A. Ekpo, 2013. Review on comet assay: A reliable tool for assessing dna damage in animal models. J. Current Res. Sci., 1: 405-427.
54. Andem, A.B., K.A. Okorafor, V.O. Eyo and P.B. Ekpo, 2013. Ecological impact assessment and limnological characterization in the intertidal region of Calabar River using benthic macroinvertebrates as bioindicator organisms. Int. J. Fish. Aqua. Stud., 1: 8-14.
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55. Andem, A.B., G.E. Eni, J.U. Idung and U.U. George, 2013. Length-weight relationship and Fulton’s condition factor of brackish river prawn (Macrobrachium macrobrachion, Herklots, 1851) from great Kwa river, Obufa Esuk beach, Cross river state, Nigeria. Eur. J. Exp. Biol., 3: 722-730.
56. Okorafor, K.A., J.A. Okete, A.B. Andem and I.E. Eleng, 2012. Assessment of grasscutter (Thryonomys swinderianus) sellers and hunters conservation knowledge, rate of hunting and methods of hunting in Oyo State, Nigeria. Eur. J. Zool. Res., 1: 86-92.
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57. Okorafor, K.A., A.B. Andem, J.A. Okete and S.E. Ettah, 2012. The composition, distribution and abundance of macroinvertebrates in the shores of the Great Kwa River, Cross River State, Southeast, Nigeria. Eur. J. Zool. Res., 2: 31-36.
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58. George, E.E., I.U. Samuel and A.B. Andem, 2012. Composition and Abundance of Phytoplankton of Adiabo River in Calabar River system, Southeast, Nigeria. Eur. J. Zool. Res., 1: 93-98.
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59. Andem, A.B., U. Udofia, K.A. Okorafor, J.A. Okete and A.A.A. Ugwumba, 2012. A study on some physical and chemical characteristics of Ona River, Apata, Ibadan South-west, Oyo State, Nigeria. Eur. J. Zool. Res., 1: 37-46.
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60. Andem, A.B., K.A. Okorafor, U. Udofia, J.A. Okete and A.A.A. Ugwumba, 2012. Composition, distribution and diversity of benthic macroinvertebrates of Ona River, Southwest, Nigeria. Eur. J. Zool. Res., 1: 47-53.