Fish Counting Systems

Smith-Root fish counting systems are used at hatcheries and major river systems throughout North America as well as many other locations around the world. Our many years of experience solving the complex variables involved in fish counting has enabled us to produce the most accurate and reliable fish counters available. Smith-Root fish counters include the following state-of-the-art features: auto-balance circuitry, stabilized amplification and detection systems; versatile power requirements using battery, AC or solar power operation, weather resistant cases, optional video recording and data logging equipment. Smith-Root fish counters give the versatility, accuracy and reliability needed by today's fisheries researcher.

SR-1101 Fish Counter

The SR-1101 Fish Counter provides a state-of-the-art fish counting system. It is designed for counting operations requiring information about both upstream and downstream fish movements. The SR-1101 provides field reliability, simplicity of operation and ease of installation.

The SR-1101 uses a single counting tunnel with metal rings, flush-mounted, on the inner surface. The passage of fish through the counting tunnel causes water conductivity changes. Special logic in the SR-1101 allows it to discriminate between upstream and downstream fish passages. Two six-digit liquid crystal displays (LCD) tally completed fish passages. The displays are easy to read even in direct sunlight.

Special Features

The SR-1101 employs an Auto-Balance system which compensates for changes in water conductivity, water temperature and marine growth. The Auto-Balance feature makes it possible to set it and forget it for unattended counting operations.

A wide-range Sensitivity Control determines the minimum size of fish that will be counted. Maximum sensitivity depends on the ratio of tunnel to fish dimensions. For best counting accuracy, tunnel diameter to fish length should not be more than one-to-one.

Output signals are provided which may be used to drive remote tally units, digital cameras or other devices. The system easily tallies five counts per second, giving 18,000 counts per hour.

Water Conditions

The SR-1101 Fish Counter is designed to work in fresh water within a conductivity range of 20 to 500 microSiemens/cc. The submerged counting tunnel should be mounted in a location to produce a velocity through the tunnel sufficient to sweep through fishes desiring to rest within the tunnel, i.e., water velocity through the counting tunnel should be equal to, or greater than, the sustained swimming ability of the fish. With a correct tunnel-size to fish-size ratio, count accuracy is typically better than 95%.

Power Requirements

The SR-1101 Fish Counter can be powered from either 120 VAC 60 Hz or from the optional 1101-RB internal rechargeable battery. The battery life varies from five to seven days, depending on water conductivity and tunnel size. A low-battery indicator will provide a warning several days before a battery change is required. When powered from 120 VAC the battery is kept fully charged at all times. An internal stand-by battery is provided to preserve count data when the AC power is turned off or when the 1101-RB battery is being replaced.

Construction

The SR-1101 Fish Counter features a rugged all-welded aluminum case. The case has a top cover with a see-through window which allows observation of count data while providing protection from rain and wet environment.

Tech Specs
Specifications subject to change without notice.
Type of detection Potentiometric bridge
Water conductivity range 20 to 5000 µS/cm
Count sensitivity 1% tunnel unbalance, minimum
Count rate 5 per second
Count capacity/channel 999,999 six digit LCD
Counting mode Directional
Type of tunnel required Three element potentiometric
Auto balance range 5% tunnel unbalance
Tunnel diameters 1" to 12" standard
Tunnel length:diameter 3:1 minimum
Smallest fish detected Length equal to tunnel diameter
Data output signals 0 to 12V pulse for each count
Power requirement 120 VAC 60 Hz or 12 VDC
Battery life 5 days minimum
Size 13.5"W x 6.25"D x 6.75"H
Weight with battery 17 lbs.
Weight without battery 4 lbs.
SRI Part 04953
Price Starting at $6,037.00
Order online 24 hours a day, 7 days a week.
Options & Accessories

Available from the online Smith-Root Store or from an authorized reseller.

SR-1101 Accessories

SR-1601 Fish Counter

The SR-1601 Fish Counter is a 16-channel fish counter. This unit is designed for hatchery fry, migrating smolt, fish eggs, emergent shrimp, and other macro organisms. The SR-1601 simultaneously monitors all sixteen tunnels for fish movements, giving individual counts for each tunnel. In order to be counted, macro organisms pass through a counting tunnel and are tallied on a 16-digit display. The system easily tallies ten counts per second per channel, giving 576,000 counts per hour.

The SR-1601 uses multiple counting tunnels that are separate potentiometric bridges. The passage of fish or eggs through each tunnel causes corresponding water conductivity changes. With a proper tunnel-size to fish-size ratio, count accuracy is typically better than 98%. For best counting accuracy, tunnel diameters should not be more than one-half the length of the fish to be counted. These are counted by the SR-1601 and displayed on separate LCDs. Any number of tunnels from one to sixteen may be used at one time.

Water Conditions

The SR-1601 is designed to work in fresh water within a conductivity range of 20 to 500 microSiemens/cc. The submerged counting tunnels are arranged to produce a velocity through the tunnels sufficient to overcome the fishes' swimming ability. The fish in the vicinity of the tunnel entrances are pulled through by the water flow. Water velocity should be equal to the burst swimming speed of the fish.

Power Requirements

The SR-1601 can be powered from either 120 VAC 60 Hz, or from the optional internal rechargeable batteries. If the batteries are installed, the counter will continue to operate for up to four days when AC power is lost. If extended operation from battery power is necessary, an external battery connector is provided. A low-battery indicator is provided to give several hours advanced warning before a battery change is required. When the SR-1601 is powered from 120 VAC, the battery is kept fully charged at all times. A secondary internal stand-by battery is provided to preserve count data on all channels when the AC power is turned off or when the internal battery is being replaced.

Construction

The SR-1601 Fish Counter features a rugged all-welded painted aluminum case. The case is weather resistant and has a top cover with a see-through window which allows observation of count data while maintaining water resistance.

Tech Specs
Specifications subject to change without notice.
Type of detection Potentiometric bridge
Water conductivity range 20 to 5000 µS/cm
Count sensitivity 1% tunnel unbalance, minimum
Count rate 10 per second/channel
Count capacity/channel 999,999 six digit LCD
Counting mode 16 discrete channels
Type of tunnel required Three element potentiometric
Auto balance range N/A
Tunnel diameters 1" to 3" standard
Tunnel length:diameter 3:1 minimum
Smallest fish detected Length equal to tunnel diameter
Data output signals N/A
Power requirement 120 VAC 60 Hz
Battery life 4 days minimum
Size 21.5"W x 9.5"D x 9.2"H
Weight with battery 35 lbs.
Weight without battery 16.5 lbs.
SRI Part 04952
Price Starting at $8,501.00
Order online 24 hours a day, 7 days a week.
Options & Accessories

Available from the online Smith-Root Store or from an authorized reseller.

SR-1601 Accessories

Tunnels

For most fish counting operations our submerged counting tunnels, called potentiometric bridge tunnels, are used to sense the passage of fish and other aquatic animals. When fish or other aquatic animals pass through a potentiometric bridge, it causes fluctuations in water conductivity between the sensing elements. These fluctuations are amplified and tallied by an electronic counter. For out-of-water fish counting, photo-electric fish counting is utilized.

Organisms passing through a counting tunnel cause fluctuations in water conductivity that are tallied by an electronic counter. Banks of tunnels are used to count large quantities of fish. Small tunnels are used to count organisms as small as fish eggs, and large tunnels are used to count large fish. The tapered entrance prevents abrasive damage and tends to separate fish entering the tunnel.

Standard Counting Tunnels

The standard SCT-1, 2, & 3 counting tunnels are 1", 2", and 3" diameter respectively. They all have a tapered entrance to prevent abrasive damage to fish. Counting tunnels are fabricated from poly-carbonate with stainless steel electrodes.

Custom Counting Tunnels

Counting tunnels can be designed and custom made to accommodate fish of most any size. Counting tunnels are usually fabricated from fiberglass but can be made of transparent plastic upon special request.

Available Worldwide

Smith-Root's authorized resellers provide sales and service for customers around the globe. Contact one in your area.
Buy Now Order online now, 24 hours a day, 7 days a week.
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