INTERACTION OF NATURAL ORGANIC MATTER AND CALCIUM ON TOXICITY OF SUBSTANCES USED FOR THE TREATMENT OF EXTERNAL PARASITES IN FISH

摘要

To control external fungi in ornamental fish breeding and aquaculture,the inexpensive therapeutic dye MAG is widely used.Due to its cancerogenic properties application of MAG,however,is restricted to the very early developmental stages.The toxicity as well as successful use of chemicals frequently depends on dosage,abiotic parameters(e.g.,temperature,hardness,organic load or pH;Gilbert et al.1979,Alderman 1985.Little,however,is known about the impact of HS interacting with other water ingredients on the toxicity of all of the following therapeutics.An inexpensive prophylactic and therapeutic mixture(known as FMC)of the agents MAG,methylene blue(MB)and formaldehyde is used to control external pathogenes in fish eggs(e.g.,Saprolegnia ssp.,Achlya ssp.)in aquaculture(Yavuzcan Yildiz & Palatsu 1999)and ornamental fish breeding(Bassleer 1983).