Effect of discharges from re-channeled rivers and municipal runoff on water quality of Opa reservoir, Ile-Ife, Southwest Nigeria

Adesakin, Taiwo Adekanmi; Adedeji, Adebukola Adenike; Aduwo, Adedeji Idowu; Taiwo, Yetunde Folasade

doi:10.5897/ajest2016.2086

Cited by 11 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The water quality of Opa reservoir has been reduced by the discharges from re-channelized rivers and municipal run off. Earlier work [2] reported that the water has low pH, low water transparency and high total dissolved solids. These aging processes affect the morphological features of the reservoir, which ultimately affects the life forms supported by the reservoir.…”

Section: Introductionmentioning

confidence: 99%

The Ecological Balance of the Fish Community in an Aging Reservoir

Taiwo¹,

Adedeji²,

Adesakin³

2018

View full text Add to dashboard Cite

Reservoir fishes contribute significantly to freshwater fish resources in Nigeria. The composition, size variation and relative abundance of fishes in Opa reservoir, Southwest Nigeria, were investigated to establish the ecological balance of the various trophic groups of fishes in the reservoir. The study was carried out in view of recent reports on the decline in the quality and quantity of water in the aging reservoir. Fishes were collected from the reservoir monthly for twelve months using monofilament gill nets and wire cages. The fishes were identified to species level and the ecological balance of the fish community was calculated as a ratio of the forage to the carnivore groups by number and by weight. Data were subjected to statistical analysis using the Stata 13 software. 1915 fishes belonging to 17 species and 10 families were collected from the reservoir. The fish composition was dominated by the family cichlidae, with its 7 species accounting for 89.8% of the total catch. There were 2 species of clariidae, which made 6.2% of the total catch. The ecological balance of the fish community was 3.4 (by number) and 6.2 (by weight). The result obtained revealed that the fish community in the reservoir is ecologically balanced. Comparative analysis of the fish composition of the Opa reservoir with reports from other reservoirs in Southwest Nigeria showed that the reservoir has more fish species than most of the other reservoirs around. The study concludes that the reservoir still supports a rich, diverse and ecologically balanced fish community. It is recommended that the management of these fish resources should be key in the holistic management of the aging Opa reservoir.

show abstract

Section: Introductionmentioning

confidence: 99%

The Ecological Balance of the Fish Community in an Aging Reservoir

Taiwo¹,

Adedeji²,

Adesakin³

2018

View full text Add to dashboard Cite

show abstract

“…Unfavourable significant changes in physicochemical parameters due to unchecked discharge into waterbodies as reported by Akinbuwa [18] and Adesakin, et al [19] in Opa reservoir could affect planktonic…”

Section: Introductionmentioning

confidence: 84%

Assessment of the Ecological Status of OPA Reservoir, ILE IFE, Nigeria Based on a Comparative Study of its Planktonic Community and Water Quality Parameters

Adedeji

Adesakin

Bolawa

2020

Open Academic Journal of Advanced Science and Technology

View full text Add to dashboard Cite

Study to determine the ecological status of Opa reservoir, Ile Ife Nigeria was conducted based on the plankton's diversity and physicochemical characteristics of the reservoir. Water samples for the analyses were collected from three established investigated stations on the reservoir for a period of one year between November 2012 and October 2013. Most of the physicochemical parameters' result were within recommended limits of the NESREA for aquatic life, but some heavy metals (Ni and Cr) were above permissible limits. One hundred and thirty-six (136) plankton species belonging to thirteen taxa were encountered whose total abundance and distribution were influenced greatly by dissolved oxygen, salinity and light obstruction parameters. Notable, recorded species at the riverine (Cryptomonas ovata, Branchionus angularis and Cyclops) revealed the unacceptable quality of the reservoir's influx. Besides, the observed low species diversity index, at all zones of the reservoir investigated, revealed dominance by few species that characterized eutrophicated waters. Furthermore, the presence of plankton pollution tolerant species (Anabaena sp., Navicula sp. and Peridinium sp.) also suggested a minimal level of organic pollution in the reservoir. The water qualities of Opa reservoir at the Lacustrine zone (76.14) and Transition zone (67.89) were of occasional threatened while Riverine zone (63.57) was frequently impaired according to the CCME Water Quality Index.

show abstract