Survival and gill morphology of different life stages of Tilapia guineensis exposed to the drilling fluid XP-07

Ciência Rural

Ijeoma Favour Vincent-akpu²  Martin Ebisingha Allison¹  Francis David Sikoki² 

[1] ,University of Port Harcourt Faculty of Science Department of Animal and Environmental Biology,Nigeria

关键词: toxicity;    histopathology;    Niger delta;    drilling;    fluid;    median lethal concentration(LC50);    median lethal time (LT50);    Teleost;    toxicidade;    histopatologia;    Delta do Niger;    fluido de perfuração;    concentração média letal(LC50);    tempo médio letal(LT50);    teleósteo;   

DOI  :  10.1590/S0103-84782010005000021

来源: SciELO

【 摘 要 】

The toxicity of drilling fluid XP-07 on gills of three life stages (fry, fingerling and post fingerling) of Tilapia guineensis was evaluated in a 96h static bioassay. The mortality rates of the organisms were determined using the same concentrations of XP-07 in all the life stages. At the end of 96h, the gills were examined for histopathological changes. The 96h median lethal concentrations for fry (Fr), fingerlings (F) and post fingerlings (PF) were 5.03, 7.77 and 6.93% XP-07 respectively. The median lethal time values decreased as concentration and time of exposure increased. The histopathological studies carried out on gills of T. guineensis showed injuries, which increased progressively with the concentration of the fluid. The fry stage was the most susceptible to the drilling fluid. This states the need for care to be taken in handling drilling fluids in Niger delta, since this area serves as breeding and nursery ground for several fish species.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License