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Gases effects on fishes; Fisheries

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Effect Of Gases On Fishes
Certain industries such as chemical manufacturing and petroleum processing deal with toxic chemicals
and potential for exposure to gases.
Here are some of the most important poisonous gases that are exposed in to aquatic life and cause death
of aquatic organisms including fishes
Hydrogen fluoride
Carbon dioxide
Nitrogen dioxide
Sulphur dioxid
Hydrogen Fluoride (HF):
The concentration of hydrogen fluoride has been increasing in freshwater and surface water day to day
owing to its expanded industrial discharge from aluminum smelters, thermal power station,
manufacturing bricks, ceramics and also from other factories like textile,paper etc.
Effects on Fishes:
In fishes it is mainly act as enzymatic poison that inhibit enzyme activity and ultimately
interrupt metabolic processes such as glycolysis and the synthesis of proteins.
It is known that it affect the soft tissue cells of Fishes.(1)
Carbon Dioxide(CO2):
Carbon dioxide is released from cement industries, deforestation as well as burning of fossil fuels like,
oil ,coal and natural gas.
Effects on Fishes:
Oceans are CO2 consuming bodies and as level of carbon dioxide increase more they consumed
and more salt is formed with in water bodies hence making water of ocean more saline.This
high salinity is affecting fishes badly.High concentration of CO2 disturb the mechanism of
osmoregulation which may lead to death of fishes.
Fishes have ability to remove excess carbon dioxide from their gills but if concentration of CO2
is high fishes will have difficulty in reducing carbon dioxide concentration resulting in
accumulation in fish blood.This accumulation inhibit the ability of hemoglobin, the oxygen
carrying molecule in fish blood ,to bind oxygen and may cause the fish to
stress similar to suffocation.

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There is an indirect affect of CO2 on fishes.Increase level of CO2 in atmosphere increase global
warming and hence solubility of oxygen in water bodies decrease due to raise in
temperature.The decrease level of dissolved oxygen cause suffocation and ultimately death of
fishes.
Nitrogen Dioxide(NO2):
Combustion of fossil fuels in industrial unit result in accumulation of nitrogen gas in air. It quickly react
with air to form nitrogen dioxide.NO2 is highly toxic gas.oxides of nitrogen dissolve in water and form
acid rain that falls on earth.The accumulation of these oxides cause gas bubble disease in aquatic
animals including fishes.
Gase Bubble Disease:
Gas bubble is a condition that affects animals and plants living in fresh and marine water that
are supersaturated with atmospheric gases.
In this disease bubbles frequently appeared behind the cornea and in the loose connective tissues of the
eye producing a severe”pop eye”condition. These bubbles gradually incrase as the length of exposure
or supersaturation increased.Fishes with these signs also showed loss of equilibrium.The time to death
varied from several hours to several weeks flowing the appearance of detectable bubbles.(2)
Eutrophication:
An abundance of nitrogen and other nutrients in water bodies increase the amount of plants and algae
growth, leading to algal blooms that block essential sunlight from reaching plants,and low oxygen water
that kills fishes and other underwater . when the excess algae die and decomposes it produce large
amounts of carbon dioxide.This lower the pH of water,and in estuaries and the ocean is known as ocean
acidification.This puts strain on the fish, shellfish and mollusks.
Sulphur Dioxide(SO2):
Sulphur gas emitted by fossil fuels and industrial units.sulphur and nitrogen oxides indirectly affect the
aquatic life.Both of these oxides dissolve in water and form acid rain.
Acid rain on soils and rocks leeches heavy metal (Al,Hg,On Cr) with it and discharge these metals in
to rivers and lakes.High concentration of these metals especially aluminum ions clogs the fish gills.It
causes suffocation and ultimately death of fishes.
Acidification also lower the pH of lakes.Few species can survive large shifts in pH , and affected lakes
could become completely lack of fish life.

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Effect Of Gases On Fishes Certain industries such as chemical manufacturing and petroleum processing deal with toxic chemicals and potential for exposure to gases. Here are some of the most important poisonous gases that are exposed in to aquatic life and cause death of aquatic organisms including fishes • Hydrogen fluoride • Carbon dioxide • Nitrogen dioxide • Sulphur dioxid Hydrogen Fluoride (HF): The concentration of hydrogen fluoride has been increasing in freshwater and surface water day to day owing to its expanded industrial discharge from aluminum smelters, thermal power station, manufacturing bricks, ceramics and also from other factories like textile,paper etc. Effects on Fishes: • In fishes it is mainly act as enzymatic poison that inhibit enzyme activity and ultimately interrupt metabolic processes such as glycolysis and the synthesis of proteins. • It is known that it affect the soft tissue cells of Fishes.(1) Carbon Dioxide(CO2): Carbon dioxide is released from cement industries, deforestation as well as burning of fossil fuels like, oil ,coal and natural gas. Effects on Fishes: • Oceans are CO2 consuming bodies and as level of carbon diox ...
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