ABSTRACT

Increased demand for commercial petroleum derivatives, including diesel has increased the possibility of numerous spills and leakages into the aquatic environment worldwide that can directly or indirectly pollute waterbody disrupting the health status of fish species and other aquatic organisms. This study was conducted to understand the effects of commercial diesel oil on freshwater species of rui (Labeo rohita), catla (Catla catla), and mrigal (Cirrhinus mrigala) fingerlings. The fingerlings were exposed to four different concentrations (0; 0.25; 0.50 and 0.75 ppm) of diesel oil, each containing three replications for 96 h. After 96 h lethal concentration (LC₅₀) for rui, 0.35 ppm; catla, 0.30 ppm; and mrigal fingerlings 0.3625 ppm, were calculated through probit analysis. Maximum mortality occurred at the highest concentration of diesel oil, and treated fingerlings showed behavioural and external morphologic alterations. Dissolved oxygen decreased with the increasing of oil concentrations, and water quality was poor among all the treatments. This study demonstrated that commercial diesel oil directly affects the survivability, behaviour, and external morphology of rui, catla, and mrigal fingerlings. It is expected that the present results will be beneficial to make awareness of the fretful effects of commercial diesel oil and other oils uses in the environment.

摘要

对商业石油衍生物（包括柴油）的需求增加，增加了向全球水生环境大量泄漏和泄漏的可能性，这些泄漏和泄漏会直接或间接污染水体，破坏鱼类和其他水生生物的健康状况。进行这项研究的目的是了解商业柴油对瑞（Labeo rohita），卡特拉（Catla catla）和fresh（Cirrhinus mrigala）鱼种的淡水物种的影响。将鱼种暴露于四种不同浓度（0、0.25、0.50和0.75 ppm）的柴油中，每种柴油含有三份重复液，持续96小时。致死浓度96 h（LC ₅₀）对于瑞，0.35 ppm; catla，0.30 ppm；通过概率分析计算出的桑m和桑625的幼鱼为0.3625 ppm。在最高浓度的柴油中，死亡率最高，处理过的鱼种表现出行为和外部形态变化。溶解氧随着油浓度的增加而降低，所有处理中水质均较差。这项研究表明，市售柴油直接影响瑞伊，卡特拉和桑m鱼种的生存能力，行为和外部形态。预期目前的结果将有助于使人们认识到商业柴油和其他机油在环境中的有害作用。