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Fish Hatchery Management - fisheries & aquaculture

Fish Hatchery Management - fisheries & aquaculture

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108 FISH HATCHERY MANAGEMDNTFIGURE 39' An essential instrument in any fish rearing operationis an oxygen meter' Catastrophic fish losses can beavoided if oxygen concentrations are checked periodically andthe optimum carrying caPacity of the hatchery can be determined.severalbrandsofmetersareavailablecommercially.(FwS photo.)lost to the air. The water has a lower capacity for oxygen, and little of it^"y,"'.t,thepondbottom.Planktonicanimalshaveshortlifespans;as*or" .r" produced during warm weather, more also die and sink to thebottom,wherebacteriadecomposethem_utilizingoxygenintheprocess.Respiration levels are high, meaning that more metabolism is occurringand more wastes produced. These also are stimulants to bacterial production.So is any uneaten food that may be provided by the culturist' Bothoxygen production and consumPtion are very rapid' and the balance is

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