• Гідрологія і Гідрометрія
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Habitat

First, before getting into the actual fishing techniques it might be advantageous to take a look at the natural feeding habits of this species. Catfish, by and large, are omnivorous feeders with a well developed sense of smell. This simply means they consume a wide variety of food items, and the fish is most often attracted to odoriferous or “smelly” morsels of food. The single greatest determinant of catfish food preference is body size. Smaller catfish, those less than 14 inches, feed primarily on bottom-dwelling organisms, such as aquatic insect larvae and other invertebrates. As catfish grow to a larger size, their diet changes and a wider variety of food items are eaten. Fish, however, either alive or dead, make up the bulk of their forage after they reach 16 inches.

The diet of channel catfish also varies with the different seasons. Some food items are more available at one time of the year than another, and channel catfish take what food is vulnerable to predation at that time. During late winter and early spring the most abundant food is a wide variety of organisms, including fish, that have succumbed to the harsh winter. These morsels, in various stages of decomposition, are consumed in large quantities by catfish. It is not unusual to find catfish stomachs gorged with decaying fish shortly after ice-out. As the water warms into late spring and summer the diet of catfish shifts continually to food items that are again most available and vulnerable. The most prevalent foods at this time of the year are aquatic and terrestrial worms, fish, frogs, crayfish, mulberries, insects and their larvae forms, elm seeds and algae. Many other items are consumed but usually make up only a small portion of the menu. Catfish food habits in the fall again change as the water cools. More fish is consumed along with aquatic invertebrates and terrestrial insects. Frogs become increasingly important for food as they move into streams before the onset of winter. Under the ice cover catfish feeding is reduced to a low level and consists mostly of dead fish that are picked up from the bottom.

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1. Habitat

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