Influence of abattoir effluents on abundance of freshwater prawns Macrobrachium vollenhovenii, M. macrobrahion and M. felicinum of Lower Ogun River, Western Nigeria
The implications of the abattoir effluents discharge into the Lower Ogun River in Isheri-Olofin area on the abundance of three African fresh water prawns: Macrobrachium vollenhovenii, M macrobrachion and M. felicinum were assessed. Monthly prawn collections were undertaken using a scooping bag net with 0.05mm mesh size at three stations with 100m intervals in each of Ishasi (upstream) and Isheri-Olofin (downstream) areas of the river for 24months (January, 2006-December, 2007). For the 24month period, the upstream (pooled data from stations 1,2 and 3) had M. vollenhovenii of total and mean density of 27,938.33 prawn/m2 and 1164.60prawn/m2 1131.04 respectively, while total and mean M. vollenhovenii density of 5,815.43prawn/m2 and 243.81 prawn/m2 231.45 were obtained in the downstream (pooled stations 4, Sand 6 data). T-test showed the entire upstream to have significantly higher M. vollenhovenii density than the entire downstream (p<0.05). The entire upstream had higher M. macrobrachium total and monthly mean density (19,092prawn/m and 816.44prawn/m2 1,354.28) than the entire downstream (6,384.47prwn/m2 and 266.02m2524.94) (p<0.05). Also, significantly higher total and monthly mean density of M felicinum were obtained upstream (20,9S6.S0prawn/m2 and 873.46prawn/m21615.06) than downstream (10,9668.11prawn/m2 and 461.16prawn/m2975.19) (p<0.05). The significance of the decline in abundance of each of the three Macrobrachium prawn species in the downstream area was discussed.
| Main Authors: | , |
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| Format: | conference_item biblioteca |
| Language: | English |
| Published: |
FISON
2009
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| Subjects: | Biology, Ecology, Macrobrachium vollenhovenii, Macrobrachium macrobrachion, Macrobrachium felicinum, Nigeria, Ogun River, freshwater environment, Abundance, Population density, Shrimp fisheries, Pollution, Pollution effects, Effluents, |
| Online Access: | http://hdl.handle.net/1834/38006 |
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