Journal of
Ecology and The Natural Environment

  • Abbreviation: J. Ecol. Nat. Environ.
  • Language: English
  • ISSN: 2006-9847
  • DOI: 10.5897/JENE
  • Start Year: 2009
  • Published Articles: 360

Full Length Research Paper

Ecological study on the impact of mariculture fish cage site on the physico-chemical characteristics of Lagos Lagoon, South Western Nigeria

Olapoju, Oluwabukunola Ayokunmi
  • Olapoju, Oluwabukunola Ayokunmi
  • Department of Marine Sciences, University of Lagos, Lagos State, Nigeria.
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Edokpayi, Clement Aghatise
  • Edokpayi, Clement Aghatise
  • Department of Marine Sciences, University of Lagos, Lagos State, Nigeria.
  • Google Scholar


  •  Received: 03 September 2014
  •  Accepted: 17 October 2014
  •  Published: 30 December 2014

Abstract

A six months investigation on the environmental impact of fish cage culture on surface water and sediment of the Lagos lagoon were studied monthly from February 2011 to July 2011. Samples were collected from three stations, 1 (upstream of cage culture site), 2 (cage culture site) and 3 (downstream of cage culture site) between 07:00 and 11:00 h. During this period, the surface water ranged between 23.34 ± 3.39 – 23.79 ± 1.52°C, depth ranged between 0.91 – 0.99 m. The lowest DO value and highest biological oxygen demand (BOD) (mean = 4.43 and 6.00 mg/L) was recorded at station 2, respectively. These values may be due to the required oxygen used to break down fish wastes and excess feed pellets from the fish cage at this station. The analysis of variance test on parameters of water samples collected showed no significant difference (p>0.05) among the three study stations while the analysis of variance test on the sediment samples collected showed significance difference (p<0.05) in ammonium and total organic carbon among the study stations. There is a need for future development initiatives to focus on best management practices (BMPs) for low impact, ecologically sound and sustainable aquaculture.
 
Key words: Lagos lagoon, fish cage, water, sediment and Nigeria.