Shown at right is the GFPA Portable Array. The array is used where a temporary barrier or guidance system is needed. They are often used for testing the feasibility of permanent array locations. The base material is 18oz. reinforced vinyl. The color is white for best observation of fishes attempting to traverse the barrier. Other colors are available upon special request. The electrodes are 5/16" diameter, stainless steel cables, held in place by sewn plastic netting. Each array is supplied with 50' of seven-conductor, #10 gauge, neoprene jacketed power cable. A strain-relief is provided that attaches between the cable and the array. As an option, longer cable lengths are available up to100 feet. The vinyl array can accommodate irregular shapes as shown below. Anchoring eyelets are provided along both sides. The standard length is 30 feet (parallel with the stream flow) which includes two 3 foot aprons for securing the leading and trailing edges. The leading edge has a sewn pocket to accommodate a cable or chain weight (not supplied). It is important to secure the leading edge in a way that prevents water from flowing under the vinyl. The standard array width is 50 feet, but optional array widths are available up to 150 feet.
A typical portable array was installed at the confluence of the San Joaquin River and Merced River in central California.
For many years adult salmon have migrated up the San Joaquin; however, due to intensive farming and slow moving water, the stream has become so polluted that salmon eggs are not able to hatch.
The Merced river, on the other hand, is a stream with much better water quality and higher velocities. Additionally, a fish hatchery is located a few miles upstream from the confluence.
This array prevents fish from swimming up the San Joaquin River, and the attraction flow from the Merced River guides them toward the cleaner stream.
