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Northwest Iowa Dairy Outlooks

A local discussion of current science and issues concerning dairying in northwest iowa

Extension Wildlife and Fisheries Specialist Billy Higginbotham reports these overcast days with or without rain means no photosynthesis is occurring and oxygen is being depleted by fish populations, particularly in those ponds where the fish populations or at or near 1000 pounds per surface acre (that’s just 100 pounds in a 1/10 acre pond!). If pond owners  suspect a problem (e.g., catfish going off feed) to check their ponds at daylight—the time of day when oxygen levels are at their dead level lowest and if fish are “piping” at the surface they need to react quickly. . Running an outboard motor in a fixed position or using a pump to pull water from near the surface and spraying it back over the pond should help.

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