Smith-Root Generator Powered Pulsator (GPP) electrofishers are unsurpassed in quality and performance. Our years of experience have helped us to produce the most complete line of generator powered electrofishers offered.
Ranging in power from 2.5 to 9kW, Smith-Root GPP electrofishers can handle all fresh or brackish water conductivities. The generators supplied with each GPP electrofisher are custom-wound to supply the optimum voltages for electrofishing and eliminate bulky and hot power transformers.
Smith-Root GPP's offer the flexibility of shore-side use or in-boat operation. Smith-Root offers everything needed to convert your Streambank GPP into a boat mounted setup.
GPP Electrofisher Models
Water conductivity is the primary criteria for selecting the appropriate model of electrofisher. Our family of GPP Electrofishers covers the full range of water conditions. Learn more about selecting an electrofisher.
How do I select the right electrofisher?
To collect fish by electrical means we must create an electrified zone of sufficient amplitude to stun fish. A fish between submerged electrodes forms part of a closed circuit, and some current flows through it. The conductivity of the water and that of the fish's flesh are the main factors that affect electrofishing.
The conductivity of water depends on the quantity of dissolved salts and minerals in the water. The conductivity of potable waters in the United States ranges from 20 to 2,000 µS/cm. Sufficient current at realistic power levels will flow through water in this range to electrofish successfully.
Low Conductivity Water
Distilled water has a conductivity range of 0.5 to 5.0 µS/cm. If typical electrofishing voltages (100 to 1100V) are applied, very little current will flow. Too little power is transferred to the water (or fish) to be effective for electrofishing.
As the water conductivity decreases (with a fixed voltage) the total current decreases and the electrical power delivered to the fish decreases. If the power is too low, fish may not be stunned enough to capture. There are two ways to compensate for this situation. The first is to increase the applied voltage, although there are practical limits based upon operator safety and possible damage to the fish when they are close to the electrodes. The second is to increase the size of the electrodes which more efficiently transfers power to the water and reduces the intensity of the electric field close to the electrodes.
If a higher voltage is used, up to 1,200 volts may be necessary. Safety is reduced for the operators, and conditions are lethal for fish close to electrodes. It is better to keep the resistance constant by increasing the size of the electrodes. The only limitations are the weight that can be handled by the operator.
Among fish of the same species, the larger fish absorb more power than the small fish. The large fish receive a much greater shock than the small fish.
Certain bottom substrates will conduct electrical current. These weaken the electric field in the water making fish capture less effective.
High Conductivity Water
High water conductivity is over 2,000 µS/cm. If a high voltage is applied, most current will flow through the water and the fish will hardly be affected. The electric current follows the path of least resistance and bypasses the fish completely. Therefore use low voltages and high currents. Currents as high as 60 amps are common, the limiting factor being the rating of the generator. The 7.5 and 9.0 GPPs can stun large fish in the interface between fresh and salt water as, for example, in taking Striped Bass for brood stock.
Very High Conductivity Water
Some brackish water and industrial waste water have conductivities over 10,000 µS/cc. Here smaller generators are unable to deliver enough voltage gradient to stun fish. Waters in this range can only be electrofished effectively with the larger model GPPs.
A fish will receive the maximum shock through its body when the conductivity of the water is the same as the conductivity of the fish's flesh. Unfortunately, this is rarely the case. Each species has a different conductivity which affects their susceptibility to electric current.
Water conductivity and effective fish conductivity increase with higher temperature. As reported for Carp:
$500 Trade-In Credit
Trade-in any used electrofisher, working or not, from any manufacturer and receive a $500 credit toward the purchase of a new Smith-Root electrofisher. Call our Sales Department at 1-360-573-0202 for complete details.
|2.5 GPP||5.0 GPP||7.5 GPP||9.0 GPP|
|Conductivity||10 to 1,750 µS/cm||10 to 5,500 µS/cm||10 to 11,000 µS/cm||100 to 25,000 µS/cm|
|Rated Output Power||2,500W||5,000W||7,500W||9,000W|
|Rated Output Max. Current||8A||16A||62A||150A|
|Output Pulse Modes||AC & Pulsed DC||AC & Pulsed DC||AC & Pulsed DC||Pulsed DC|
|DC Output Peak||0 to 500V low, 0 to 1,000V high||0 to 500V low, 0 to 1,000V high||0 to 1,000V in 4 steps||0 to 680V in 4 steps|
|AC Output RMS||0 to 350V low, 0 to 700V high||0 to 350V low, 0 to 700V high||0 to 700V in 4 steps||N/A|
|Output Pulse Frequency||7.5, 15, 30, 60 & 120Hz||7.5, 15, 30, 60 & 120Hz||7.5, 15, 30, 60 & 120Hz||7.5, 15, 30, 60 & 120Hz|
|Output Current Metering||AC & DC 0 to 8A||AC & DC 0 to 25A||AC & DC 0 to 199A||DC 0 to 199A|
|High Voltage Output Indicator||Panel lamp & audio tone||Panel lamp & audio tone||Panel lamp & audio tone||Panel lamp & audio tone|
|Output and Safety Control||Foot switch & panel switch||Foot switch & panel switch||Foot switch & panel switch||Foot switch & panel switch|
|Timer Display||0 to 999,999 seconds LCD||0 to 999,999 seconds LCD||0 to 999,999 seconds LCD||0 to 999,999 seconds LCD|
|Cooling||Air Cooled||Air Cooled||Air Cooled||Fan Cooled|
|12VAC Auxiliary Power*||500W 42A||2 @ 500W 42A||2 @ 500W 42A||2 @ 500W 42A|
|Output Connectors||CPC with 15 in cable||CPC with 15 in cable||CPC with 15 in cable||POS. CAM CONN. with 15 in cable|
|Pulsator Weight||13 lb.||13 lb.||36 lb.||40 lb.|
(L x W x H)
|16 in x 7.25 in x 11.5 in||16 in x 7.25 in x 11.5 in||20 in x 15 in x 16 in||20 in x 15 in x 16 in|
|Generator Engine Size||7 HP||14 HP||14 HP||18 HP|
|Generator Weight||101 lb.||200 lb.||214 lb.||239 lb.|
(L x W x H)
|23 in x 15.625 in x 16.5 in||30.5 in x 21.5 in x 21 in||30.5 in x 21.5 in x 21 in||30.5 in x 21.5 in x 21 in|
|* Note: 12 volt auxiliary power subtracts from Electrofisher power available.
Specifications subject to change without notice.