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So clean up any leftovers quickly with a net and throw them out. They should not be used during initial water cycling, however, when introducing friendly bacteria supplements, nor for a few days after changing a filter or the media inside a filter. The only way to detect its presence is by testing for it, and a fish farmer should not only invest in a water quality test kit, but learn to use it on a regular basis. A fish's gills are permeable to water and salts. The proportion of un-ionized to ionized ammonia shifts in relation to pH and water temperature. Low-dissolved oxygen levels are responsible for more fish kills, either directly or indirectly, than all other problems combined.
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Praziquantel degradation in marine aquarium water

The extent of the reduction in pH depends on the amount of CO 2 already present in the water. All the fry of maraena and peled died within 10—14 days of hatching. If fish are exposed at a lower atmospheric pressure to such water, their blood equilibrates with the excess pressure in the water. The clinical and patho-anatomic pictures of fish poisoning by these pesticides are not specific.
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