Aquatic Macroinvertebrates are small organisms without backbones that live in water. They average in size from 0.5 mm (about the size of a pencil dot) to 50 mm (approximately 2 inches). The Boyne River contains macroinvertebrates from several animal classes including aquatic insects, crustaceans, mollusks and aquatic spiders. They play a major role in the food chain. Without them forage fish and trout could not live in the Boyne River.
They are also indicators of river health. For instance, if stoneflies are present in a river, it verifies that the river has high quality water. If the water is polluted or too warm to support stoneflies then the river may not support trout either. Fortunately, the Boyne River has many stoneflies and high quality water and, therefore, a nice population of trout.

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