PDF | Background: Cadmium (Cd) is considered as one of the most toxic heavy metal. Intake of Cd by fish has serious implications. Metal pollution from. Corresponding Author: Adedeji O.B., Veterinary Public Health and Preventive Medicine University Of Ibadan, Nigeria. Overview of Cadmium Toxicity in Fish. and breathing (including the gills in fish). Animals given cadmium in food or water develop high blood pressure, iron-poor blood, liver disease, and nerve/brain damage. Cadmium is toxic to aquatic organisms at low concentrations.


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Signs of emaciation were evident on the surface of abdomen, where slight bulging was observed.

The intestinal wall had ulcers, and, in some cases, it protruded from the anus, where there also was large amount of catarrhal mucoid secretion This was likely due to the presence of trematodes, nematodes, cestodes, and thorny-headed worms that were embedded between the villi cadmium toxicity in fish intestine.

This caused local damage to the intestinal mucosa and possibly peritonitis. Proteolytic enzymes may have been discharged by the adult worms, resulting in the degradation of the intestinal tissues 11 — January 06,English editing: February 02,Quality control: February 05, References 1.

Effect of some heavy metals cadmium toxicity in fish on some biological and histopatholigical changes in the blue tilapia oreochromis aureus.

Effect of cadmium toxicity on Vertebrates

Egypt J Agric Res. Cadmium is toxic to a wide range of cadmium toxicity in fish. However, the presence of sediment, high concentrations of dissolved salts or organic matter all reduce the toxic impact. The main effect is on growth and replication. Zinc increases the toxicity of cadmium to aquatic invertebrates.

Effect of cadmium toxicity on Vertebrates

Sub-lethal effects have been reported on the growth and reproduction of aquatic invertebrates; there are structural effects on invertebrate gills. There is evidence of the selection of resistant strains of aquatic invertebrates after exposure to cadmium in the field.

An increase in toxicity as temperature increases and salinity decreases has been noted. This implies that the cadmium toxicity in fish cadmium concentration may have the potential to cause greater toxicity to estuarine rather than to marine species.

Effect of cadmium toxicity on Vertebrates

Some studies of this process ion fish have indicated cadmium toxicity in fish cadmium may have toxic effects that result in alterations of the physiological processes in the blood and tissue of fish 4.

Thus, it is important to monitor the concentrations of heavy metals in aquatic environments. Currently, there is more awareness of the importance of studying parasites that affect fish. In Egypt, some fish farms depend on agricultural drainage water mixed with industrial pollutants cadmium toxicity in fish phosphate fertilizers, which are the main sources of Cd in the environment 7.

This observation is especially of concern in the Kafr El-Sheikh Governorate.


cadmium toxicity in fish Both types of pollution are significant sources of the cadmium pollution that affects the prevalence of internal parasitic diseases in cultured fishes 8.

The present study dealt with most prevalent parasitic infection in the cultured O.

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In this work, the main clinical findings in naturally infested O. Upon examination, it was apparent that some of the fish were making abnormal movements and had cadmium toxicity in fish shapes scoliosis.

The deformities also appeared as scoliosis and compression of the vertebral column.


The majority of chelating agents decrease cadmium uptake but some, such as dithiocarbamates and xanthates, increase uptake. Increasing temperature increases the uptake and toxic impact, whereas increasing salinity or water hardness decreases them.

Cadmium is toxic to a wide range of micro-organisms. However, the presence of sediment, high cadmium toxicity in fish of dissolved salts or organic matter all reduce the toxic impact.