Toxicity of heavy metals to fish: an important consideration for sucessful aquaculture
Heavy metals are toxic to man, animals and plants once safe limits are exceeded. Then ability to bio accumulate in plant and animal tissues makes them particularly hazardous. Heavy metals are toxic to all aquatic biota and cause high mortality of fish larva, fry, fingerling and adult fish. They accumulate in the gills, heart, liver, kidneys, brain, bones and muscles of fish. The physico-chemical forms of heavy metals determine their mobility, availability and toxicity to fish. These metals enter aquaculture systems through various means (polluted water, storage facilities, fish feed, atmospheric deposition, etc) and constitute a factor detrimental to successful aquaculture. This paper reviews the mode of entry, transport and toxicity of some selected heavy metals to freshwater fish. Methods for the determination of these metals in water, fish and sediment samples are also presented. Ways of preventing their entry into aquaculture systems together with the safe limits of concentration of these metals in aquaculture systems are also included.
| Main Authors: | , |
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| Format: | conference_item biblioteca |
| Language: | English |
| Published: |
Fisheries Society of Nigeria
2007
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| Subjects: | Pollution, Aquaculture, Nigeria, freshwater environment, Heavy metals, Toxicity, Pollution effects, Fish culture, |
| Online Access: | http://hdl.handle.net/1834/37772 |
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