地理ジャーナルと自然災害
オープンアクセス

概要

ナイジェリア、イモ州オタミリ川の底生魚相と物理化学的パラメータ

イケンナ・ケルビン・オビヨール、クリストファー・ディディウー・ヌワニ、* グレゴリー・エジケメ・オド、ジョゼフィン・チネニエ・マドゥ、ドリス・ウルンマ・ンドゥディム、イフィアニー・オスカー・ンディムカオハ・アグジー

The study on the fish fauna and physicochemical characteristics of Otamiri River was carried out for six months (June to August and October to December 2015). Samples were collected monthly from three sampling stations along the river. Eckman grab, scoop net, line and hook , cast net, traps and dugout canoe were used to collect the fish samples. Samples were collected from three stations, station 1 (dumpsite in the river), station 2 (dredging section) and station 3 (vegetable farming section). A total of 129 fishes belonging to 5 species, Synodontis budgeti, S. soloni, Chrysicthys nigrodigitatus, Clarias gariepinus and Papyrocranus afer were collected. Station 3 had the highest species composition (n=4) and fish abundance, 108 (83.7%), while station 1 had the least species composition (n=2) and the least fish abundance, 10 (7.8%). Temperature variation from June to December was wide at station 1 (25-28ºC), unlike station 2 (27-28ºC) and station 3 (28-29ºC). A similar trend was replicated by Dissolved Oxygen (DO). Significant correlation of S. budgeti abundance and temperature (r=0.696, p<0.05), depth of river (r=-0.615, p<0.01) and turbidity (r=0.595, p<0.01) was observed. Similarly, a significant correlation of C. nigrodigitatus abundance and temperature (r=0.473, p<0.05), C. gariepinus abundance and depth (r=-0.481, p<0.05) , P. afer abundance and temperature (r=0.530, p<0.05) was observed. Fish species abundance and composition in Otamiri River was significantly affected by anthropogenic activities.