Chikere-Njoku and Njoku
Greener Journal of Soil Science and Plant Nutrition Vol. 4 (2), pp. 014-021, July 2017.
ISSN: 2354-2292 © 2017 Authors
Manuscript Number: 071217081
Effect of Soil Nutrient Status on Carcass Quality of Pond-Raised Tilapia, Oreochromis niloticus (Linnaeus, 1758)
Chikere-Njoku C.1 and Njoku D.C.2*
1 Department of Soil Science and Environment, Imo State University Owerri
2Department of Fisheries and Aquaculture, Federal University of Technology Owerri.
The effect of nutrient status of soil on carcass quality of fish raised in earthen ponds was investigated between March and August 2016. Three soil profile pits were dug side by side three existing earthen ponds in three different geomorphological locations of Imo State at Umuagwo, Ulakwo and Uboma. Three homogenous soil horizons ( 0-20, 20-60, 60-150 cm) were identified and evaluated for nutrient composition by standard methods (USDA, 1971). Ten adults of Oreochromisniloticus of average weight of 250.0 + 5.4g randomly selected from the associated earthen ponds were chemically evaluated for carcass composition in accordance with AOAC (2005). Soil textural class for the pond at Umuagwo was dominantly sandy, sandy loam at Ulakwo and clay loam at Uboma. Soil nutrient analysis showed that the sandy soil was grossly poor in total nitrogen (0.04 – 0.08) and soil exchangeable bases, K (0.01 -0.04%), Na (0.003-0.005%) as against the clay soil which had appreciably higher reserve of total nitrogen (0.21-0.32%), organic carbon (1.22-2.50%) and exchangeable bases, K (0.06-0.18%), and Na (0.020.09%). Nutrient composition of fish carcass from the clay pond in terms of two most important nutritive factors of crude protein (32.1 + 3.0%) and fat (6.36 + 0.1%) was significantly higher (P< 0.05) than in the sandy pond (14.7+ 2.0%), 4.4. + 0.5%) and the sandy loam (14.9 + 25 %, 4.7 + 0.2 %) respectively. The implication of this in site selection of earthen ponds is discussed.
Key words: Soil nutrient, carcass quality, Oreochromisniloticus.
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