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Diagnosing the cause of fish poisoning
Causes and effects of pollution on fish
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acid acute toxicity tests alkalinity aluminium ammonia poisoning aquatic environment aquatic organisms bacteria bioaccumulation blood serum body surface cadmium carbon dioxide carp cause cells changes chemical chlorine chromium colour common carp compounds contain copper cyanides cyprinids damage Daphnia diagnosis discharges dissolved oxygen effects ElFAC epithelium examination exposure fish culture fish poisoning fisheries free CO2 freshwater fish harmful highly toxic increase kill lethal concentrations litre for cyprinids litre for salmonids low toxicity maximum admissible mercury metals methaemoglobin methods mg per litre mucus nitrite occur organo-phosphorus oxidation oxygen concentration oxygen deficiency oxygen demand patho-anatomic picture PCBs periphyton pesticides pH values Phenols physico-chemical phytoplankton plants poissons d'eau douce pollution Polychlorinated biphenyls ponds rainbow trout reduced respiration respiratory salmonids sediments sensitive sewage soluble surface waters surfactants tissues toxic action toxic gill necrosis toxic substances toxicity to fish water pH water quality water sample water temperature zinc zooplankton