This monitoring protocol calls for a combination of gear types, including electrofishing, hoop netting, Fyke netting and trawling. 

A hoop net set consists of a large baited hoop net and a small baited hoop net.  The standard unit of hoop netting effort is the net-day, where days are 24.0 h and each hoop net cab counts as one net. 

Large hoop nets (Model H25F, Memphis Net and Twine Co., In., Memphis, TN) have seven fiberglass hoops and are 4.8 m (16 ft) long.  The first hoop is 1.2 m (4 ft) in diameter; successive hoops decrease incrementally in diameter my 2.5 cm toward the cod end of the net.  The #8 nylon netting, 3.7-cm diameter bar mesh, is protected with a black asphalt-type coating (Netcoat, Memphis Net and Twine Co.).  Two finger-style throats are attached, one to the second hoop and one to the fourth hoop.  The throat on the second hoop is 15.5 meshes long and has an aperture circumference of 35 meshes.  The throat on the fourth hoop is 13.5 meshes long and has an aperture circumference of 26 meshes.  The cod end has  a2.4-m-long drawstring made of 0.63-cm diameter asphalt-coated nylon cord.

Small hoop nets (specially ordered from Memphis Net and Twine Co., In., Memphis, TN) have seven fiberglass hoops and are 3 m long.  The first hoop is 0.6 m in diameter; successive hoops decrease incrementally in diameter my 2.5 cm toward the cod end of the net.  The nets are constructed from #9 nylon netting with 1.8-cm-diameter bar mesh and are protected with a black asphalt-type coating (Netcoat, Memphis Net and Twine Co.).

 Two finger-style throats are attached to the second and fourth hoops.  The throat on the second hoop is 14 meshes long and has an aperture circumference of 28 meshes.  The throat on the fourth hoop is 12.5 meshes long and has an aperture circumference of 22 meshes. 

Both nets are bated with 3 kg. of soybean cake, 1 kg placed in a 1.9-cm-diameter mesh bag attached to the rear of the net, and 2 kg placed loosely in the rear of the net.  Hoop nets are deployed in pairs, with both members placed in the same habitat stratum.  Hoop nets are fished with the open end of the net facing downstream.  Depth must be sufficient to submerge all throats of hoop nets.

See text for extensive description of methodology.