Temporal And Spatial Changes In Water Quality In Lake Malawi/Niassa, Africa Implications For Cage Aquaculture Management

Macuiane Ma, Hecky Re and Guildford Sj
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Macuiane Ma: Large Lakes Observatory, University Minnesota Duluth, USA
Hecky Re: Instituto Nacional de Desenvolvimento da Aquacultura, Moçambique
Guildford Sj: Biology Department, University of Minnesota, USA

Oceanography & Fisheries Open Access Journal, 2016, vol. 1, issue 1, 8-16

Abstract: Water temperature (WT), Secchi depth (SD), Percent dissolved oxygen (%DO), Dissolved oxygen (DO), Total nitrogen (TN), Total phosphorous (TP), and Chlorophylla (Chla) were measured in three sites, one at the farm (site 2) and two, 5 km northwest (site 1) and southeast (site 3) of the farm respectively, in February, April, June, and August 2012 to assess their spatial and temporal change in relation to cage aquaculture. There was clear seasonal change in % DO, DO, Chla, and SD at all sites. WT, % DO, and DO were consistently greater at site 1 than at site 3. Chla and SD were inversely correlated. The highest Chla and lowest SD occurred in April. The water was less clear at the farm, relative to the non-farm sites. Interestingly, this pattern was not seen in the Chla suggesting that decreased transparency at the farm was caused by some other factors in addition to Chla.

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Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:adp:jofoaj:v:1:y:2016:i:1:p:8-16

DOI: 10.19080/OFOAJ.2016.01.555552

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