HATCHERY OPERATIONS 95 



SUPPLY LINE 



BOX FILTER 



1 



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LEVEE 



SCREEN BOX FILTER 



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Figure 38. Box- type filters mounted in fixed positions. 

 (Diagram from Arkansas Game and Fish Commission; 

 photo courtesy of Fish Farming Experimental Station, 

 Stuttgart, Arkansas.) 



Depending on the fish species, either algae or zooplankton (or both) supply 

 food to fry and fingerlings. 



A number of factors effect the use of fertilizers, and responses are not 

 predictable under all conditions. Physical influences include area and 

 depth of the pond, amount of shoreline, rate of water exchange, turbidity, 



