title: Differential response of Tilapia guineensis fingerlings to inorganic fertilizer under various salinity regimes.
abstract: The influence of salinity on the response of the estuarine teleost, Tilapia guineensis fingerlings to acute toxic effects of inorganic nitrogen-phosphorus-potassium (NPK) (15: 15: 15) fertilizer was investigated using semi-static bioassay. The toxicity of NPK fertilizer was found to increase significantly with increase in the salinity level from 0.05 %. to 32.4 %o. The 96 hr LC50 value at salinity of 32.4 %o was 0.11 mg/l and was found to be significantly (p < 0.05) higher than the toxicity values at any other salinity level of media evaluated. The implication of the findings is that pollution control standards and/or safe limits for brackish water ecosystem should consider variations in salinity regimes for greater relevance and reliability.
authors.affiliation: Aquatic Toxicology and Ecophysiology Laboratory, Department of Marine Sciences, University of Lagos, Akoka, Lagos, Nigeria. obinnalcunilag@yahoo.com
authors.forename: L O
authors.initials: LO
authors.lastname: Chukwu
authors.forename: H A
authors.initials: HA
authors.lastname: Okpe
mesh_terms: D000818:Animals; D017756:Aquaculture; D005308:Fertilizers / Q000633:toxicity*; D009584:Nitrogen / Q000633:toxicity; D010758:Phosphorus / Q000633:toxicity; D011188:Potassium / Q000633:toxicity; D012623:Seawater / Q000737:chemistry; D012965:Sodium Chloride / Q000494:pharmacology*; D017210:Tilapia / Q000254:growth & development / Q000502:physiology*
chemical_list: D005308:Fertilizers; D010758:Phosphorus; D012965:Sodium Chloride; D009584:Nitrogen; D011188:Potassium