Wetland Functions and Values: Fish Habitat

person holding a bullhead catfish

Certain freshwater fish species require wetlands as spawning grounds and as nursery areas for their young. Spring spawning by northern pike in Lake Champlain is a particularly good example. Others, like black bullhead, yellow perch, pumpkin seed and bluegills, leave open water to spawn in shallow-water wetlands. The failure of many aspects of commercial and recreational freshwater fishing in the Great Lakes has been linked to wetland destruction.

 

 

 

lily pads floating in marsh water

Wetlands can be thought of as the farmlands of the aquatic environment since they produce great volumes of food (plant material). The major food value of wetland plants comes when the plants' dead leaves and stems break down in the water to form small particles of organic material called "detritus". This enriched material is the principal food for many small aquatic invertebrates, various shellfish, and forage fish that are food for larger predatory fish. These larger fish are, in turn, consumed by people.

 

 

According to the Vermont Wetland Rules, wetlands that are used for spawning by northern pike or that are important for providing fish habitat are significant wetlands. In determining whether a wetland is significant for fish habitat the Secretary or Panel shall, at a minimum, consider the extent to which it:

a. Provides spawning, nursery, feeding or cover habitat for fish.
b. Lowers or moderates the temperature of surface waters due to the discharge of cold springs, the provision of shade or for other reasons.

Wetland trees providing shade to stream of murky water
Wetland trees provide shade that moderates water temperatures.


Links of Interest

  • Fish of the Great Lakes. The Wisconsin Sea Grant provides photos, drawings, statistics, and habitat requirements of fish found in the Great Lakes, many of which are also found in the Lake Champlain Basin.
  • Vermont Fish and Wildlife. A guide to the sportsfish of Vermont.

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