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Mayfly Species Callibaetis californicus (Speckled Spinner)

This western species is the largest of the Baetidae family. It can be quite common in weedy and cold stillwaters, especially on the West Coast as it's name implies. Initial broods can be 12mm or larger making them easy to recognize. At the lower end of its size range however, it is quite difficult if not impossible for anglers to distinguish from its smaller and more common sibling, Callibaetis ferrugineus hageni. They are so similar in behavior and appearance that discerning the difference is not a factor in angling success. See the Callibaetis Hatch Page for pertinent information.

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