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Article Title: Effects of Low pH and Iron Toxicity on survival of Oreochromis niloticus and Lowland NERICA Rice Seedlings


An assessment of the effects of water acidity and iron toxicity on Oreochromis niloticus fingerlings and NERICA L-19 rice seedlings cultured in a low lying land area of Badore Research Centre, NIOMR – Lagos was done. The experimental units were designed as rice units, rice cum fish units and fish units. Each unit was replicated four times. The average pH and iron levels in the rice units ranged from 5.0 – 6.2 and 7.5 – 8.0 ppm respectively. The rice cum fish units had average pH and iron levels of 5.2 – 6.0 and 7.5 – 8.0 ppm respectively, while the lowest pH levels were found in the pond units and ranged from 3.5 – 6.95, the iron content in the pond water ranged from 3.0 – 8.0 ppm. The experimental units with the lowest pH resulted in high fish mortality. Adverse effects of low pH and high iron content on the rice seedlings were observed to be minimal. The implication of the combined effects of low pH and high iron content in soil and water for tilapia fingerlings and rice seedlings is discussed.