Fish distribution in 28 Italian lakes based on CEN gillnets

Study Extent

Data were obtained between 2007 and 2014 from standardised (CEN based) samplings with benthic and mesopelagic multi-mesh gillnets.

Sampling

specification of method(s) used for sampling and sorting: According to the depth and surface area of the lake, an appropriate number of benthic and pelagic multi-mesh gillnets were used, following CEN standards partly modified. Each benthic net was 40 m long and 1.5 m high and was composed of 16 panels (each 2.5 m long) with mesh sizes ranging from 5.5 to 135 mm. The benthic nets were set from the surface down to 100 m depth. Pelagic sampling was performed with a variable number of nets linked together, each being 27.5 m long and 6 m high and having 11 panels (with a mesh size ranging from 8 mm to 55 mm, knot to knot). Four additional nets (40 m long, 6 m high, 4 panels (75, 95, 115 and 135 mm)) were attached to the end of each pelagic net set. The nets were set at 10 m intervals from the surface down to 50 m depth. Nets were set at dusk between 16.00 and 20.00 pm and lifted the following morning between 06.00 and 08.00 am.

Method steps

1. commonly used series of methods steps regarding fish (e.g. sampling, identification, data management)

1. Fish

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