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A hydrogen sulfide bloom (green) stretching for about 150km along the coast of Namibia. As oxygen-poor water reaches the coast, bacteria in the organic-matter rich sediment produce hydrogen sulfide, which is toxic to fish. Hydrogen sulfide has been implicated in several mass extinctions that have occurred in the
According to the Food and Agriculture Organization (FAO), a total of 156.2 million tons of fish, crustaceans, molluscs, and other aquatic animals were captured in 2011. This is a sum of 93.5 million tons of wild animals and 62.7 million tons of farmed animals. 56.8% of this total was freshwater fish, 6.4% diadromous fish, and 3.2% marine fish, with the remainder being molluscs, crustaceans ...
The term fish kill, known also as fish die-off, refers to a localized mass die-off of fish populations which may also be associated with more generalized mortality of aquatic life. [ 1 ] [ 2 ] The most common cause is reduced oxygen in the water, which in turn may be due to factors such as drought , harmful algal bloom , overpopulation , or a ...
Furthermore, detailed organic geochemical studies have recently revealed the presence of molecules (so-called biomarkers) that derive from both purple sulfur bacteria [10] and green sulfur bacteria—organisms that required both light and free hydrogen sulfide (H 2 S), illustrating that anoxic conditions extended high into the photic upper ...
A red tide has persisted in Southwest Florida and Tampa Bay area waters since October 2022. If you’re wondering why there are dead fish in the water or irritation in your throat when you visit ...
Hydrogen sulfide is recognizable for its unpleasant rotten-egg odor. Because hydrogen sulfide is heavier than air, it tends to linger around lagoons even after ventilation. [17] Levels of hydrogen sulfide are at their highest after agitation and during manure removal. [5]
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Hydrogen (H) is the most abundant element in the universe. [38] On Earth, common H-containing inorganic molecules include water (H 2 O), hydrogen gas (H 2), methane (CH 4), hydrogen sulfide (H 2 S), and ammonia (NH 3). Many organic compounds also contain H atoms, such as hydrocarbons and organic matter.