buzzers => mosca artificial..pesca com pluma..Pesca com Mosca Seca..Pesca com Ninfa

What are buzzers?

Buzzers are tiny insects also known as chironomids. This family of non-biting midges are found across the world and closely resemble mosquitos in their buzzing flying patterns. They also make a quiet buzzing sound when hovering within earshot – hence the common name. Elsewhere in the world these tiny insects are just known as chironomids and it’s mainly in the UK that they’re called buzzers.
Are buzzers aquatic insects or terrestrials?

They’re aquatic insects. Like mosquitos, chironomids also have aquatic larvae so they’re very common around freshwaters, especially still waters. They’re also extremely abundant and they form a major component of the diet of many fish, especially trout, at most stages of their lifecycle.
Buzzer larvae. Picture by Frank Fox.

Buzzer larvae. Picture by Frank Fox.
What is the lifecycle of a buzzer?

The buzzer or chironomid midge has four main stages to its lifecycle: larvae, pupae, emerger and adult. The life stages occur throughout the year, and fly fishers have tied patterns to imitate each one, so it’s always worth having a selection in your fly box. The trick to becoming successful when fishing buzzers for trout is to work out which stage of the buzzer lifecycle the trout are feeding upon at a particular time of the day or year.

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Note added at 22 mins (2015-07-12 16:39:01 GMT)
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https://pt.wikipedia.org/wiki/Pesca_com_mosca