Arkansas Game and Fish Commission Chairman Bobby Martin of Rogers loaded the first batch of rainbow trout last week at the remodeled Jim Hinkle Spring River State Fish Hatchery in northeast Arkansas.
The hatchery, Arkansas’ only state-owned cold water hatchery, supplies rainbow trout to 43 locations throughout Arkansas, including the White, North Fork and Spring rivers.
The hatchery, which was originally built in 1974 and was donated to Game and Fish by the Kroger Company in 1985, draws cold water from the Spring River, hatches eggs supplied through federal trout hatcheries and cares for the trout until they reach 12 inches long. The process takes about 16 to 18 months from egg to stocking-size fish.
“At its peak, the hatchery was able to supply more than 1 million rainbow trout per year, but it’s been a long time since we have reached those production numbers,” said B.J. Vandiver, hatchery manager.
Federal hatcheries supply the remainder of Arkansas’ trout each year, bringing the total trout stocked by federal and state sources above 2 million fish in some years.
Time had taken its toll on the hatchery’s infrastructure, causing managers to shut down nearly half of the facility’s trout-production capacity.
“There were 36 metal silos where we had grown trout that had been taken out of production well before the renovation. They were 13 feet deep and 17 feet wide,” Vandiver said. “They were over 50 years old and had deteriorated to the point that the walls were only half as thick as they should have been. When you pulled water out of them, the walls were beginning to bulge and became a safety hazard for anyone who had to work in them to transfer trout to trucks.”
The outdated metal structures were replaced with 24 concrete silos that measure only 7 feet deep but accommodate the same amount of trout with their 28-foot diameter. The new design is not only safer, but it is also more efficient, with drains at the bottom of each silo to evacuate water.
“We had to pump all the water out of the old silos with every batch of fish to eliminate any biosecurity issues, and there really wasn’t a way to drain it completely,” Vandiver said. “These are much easier to drain and clean. They also will be much easier to harvest fish from when they are ready.”
There are a few finishing touches left to complete, but Vandiver hopes to have the hatchery rolling out trout at production levels it hasn’t seen in more than a decade.
The expanded space also should allow Game and Fish to try some new techniques to increase production or efficiency at the hatchery. Increased capacity will enable fish to be raised at lower densities, which may increase growth rates and cut down rotation time or enable the hatchery to produce slightly larger fish before they are stocked.