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Walleye production at the The life cycle of walleye restocked by the Chesapeake Hatchery Chesapeake Hatchery Restocked lakes "On Bull Shoals, our stocking has increased," Pratt said. "The last few years we have been stocking 264,000 walleyes into Bull Shoals. But this year due to our recent tagging study, we bumped that up to 352,000 fingerfings. On Norfork, we will put 220,000" Studies indicate that by age 3, male walleyes in Bull Shoals will be more than 18 inches long and females wll be more than 20 inches Springfield Hatchery Collect breeding adults Biologists with the Missouri Department of Conservation take a boat equipped with electro-fishing equipment out on Bull Shoals Lake in spring. The boat sends direct electric current into the water to momentarily stun the fish in its field. Biologists then collect the walleyes with nets. need to collect 2 million to 25 milion eggs. About 50 percent of those eggs will go on to become fry." in about 35 to 40 days, 30 percent to 40 percent of the fry will have grown into fingerlings of about 2 inches Warm spring weather can increase that growth rate Stocking and natural recruitment, or natural spawning. work in tandem to populate the lakes with walleyes. "According to a study done back in the early 1990s on Norfork, about 40 percent of the population is made up of stocked fish" Pratt said. We are in the process of determining that rate on Bull Shoals. In a couple of years, we will have some answers." Chesapeake Fish Hatchery It was a weary-eyed group of fisheries biologists and resource technicians that gathered for an 8 am. meeting at the Missouri Department of Conservation's Chesapeake Hatchery. Most had been out through the wee hours of the morning for the mid-March gathering of walleye eggs from Buls Shoals Lake AJ Pratt, fisheries management biologist who oversees Bull Shoals and Norfork lakes, among his other duties, had been pikloting the boat that shuttled walleyes from the two electro-fishing boats back to the shore where they would be spawned or put in a tank truck for transport back to the hatchery. The shocking boats were targeting the area near the dam below Lake Taneycomo. They will make a traditional spawning run, and we try to intercept them when they get up into that area," Pratt explained. "We want to collect enough females and males to meet our stocking needs for the year" "Ideally, we would like to collect those females that an spawning. or releasing their eggs. That way we don't have to take them to the hatchery and hold them. That just Water output Hold ponds Collecting the eggs Biologists rub their fingers along the walleye's abdomen toward the tail to get them to release their eggs or sperm. Sperm from three males is mixed with eggs of each female to ensure genetic diversity and fertilization. The eggs are then mixed with a fine clay to prevent them from sticking together. Branson are Table Rock Lake MISSOURI adds additional stress to them." About 50 females were collected this year, which will yield from 50,000 to 200,000 eggs each. "What we are shooting for is 572.000 fingerlings. You ARKANSAS Bull Shoals O, Lake - Chesapeake Spring i Norfork Lake The Chesapeake Spring is diverted and pumped to supply all of the Water supply hatchery's water needs. The water is then returned to Chesapeake Creek 10 miles -Steve Brigman Moving the remaining adults Not all females are ready to spawn when collected. The remaining walleyes are put into hauling tanks on a flatbed truck and taken to the Chesapeake Hatchery. They may be given hormones and then spawned at the hatchery several days later. Laboratory and offices A fully equipped lab is maintained on-site to effectively monitor the walleyes' development and make sure that expected hatching rates are being achieved. The 'McDonald jars' The fertilized eggs are placed in a McDonald jar for incubation. The jar pumps cold water directly to the eggs, providing them with the necessary circulation and orygen. The eggs will take from 13 to 15 days to hatch. Slow development As the eggs mature, they will soon turn a brown color. They are initially treated with a formalin' to prevent fungus from preying on the eggs. The white spots in the image at left are eggs that died from fungus. Each quart in the jar contains about 110,00 to 120,000 eggs. Gravity drains water out of each tank row and it flows out of the building through channels in the floor The fry stage After the eggs hatch they enter the fry stage. The fry will use their recently developed tails to swim and let the current carry them over the lip of the McDonalds jar' and into a holding bucket. The buckets are then moved to a separate incubation area where the fry will be monitored for four to five days. Fry holding tanks Adult fish holding tanks Egg incubation jars This is where fertilized eggs spend their first two weeks. They are carefully monitored for their development and biologists work constantly to prevent the eggs from succumbing to parasitical fungi. Take a visit The hatchery is open 8 am. to 4:30 p.m. Monday through Friday. To schedule a tour, call 466-3421. Fry live off the yolk sac during their time in the tanks. They are given time to let their mouth parts develop more so they can feed on their own. The fry are about the length of an eyelash when they are transferred into the rearing ponds that have been prepared for them. Female walleyes that weren't ready to spawn when they were captured at the lake are kept in these tanks. Each fish is kept separate from the others to deter the species' cannibalistic tendencies when interacting with smaller fish. Water supply- Overflow aquarium The holding ponds The outdoor ponds must be stocked with alfalfa meal before the fry can be moved. This encourages the growth of microscopic phytoplankton, which encourages the growth of a zooplankton called daphnia, which is the basis of the fry's food supply. When the pond is ready. the fry are carried to the ponds in plastic bags 2005 total hatcheries output: Holding tank Water supply Filter to prevent escape Walleye Channel catfish Largemouth bass Bluegill Hybrid sunfish Striped bass White crappie 1.370,850 332,206 195,378 537,594 22506 25,737 9,000 4,605 3,310 Growing strong The fry will live in 10 ponds at the hatchery for about 35 to 40 days. When they reacha length of 2 inches, they will be loaded on trucks to restock Bull Shoals and Norfork lakes. At the end of the season Chesapeake Hatchery will have produced about 35 million walleyes Water supply Screen dividers "McDonald jar "McDonald jar Paddlefish Muskellunge MAP SOURCES: ESRL TELEATLAS MAGE SOURCES STEPHEN BRIGMAN MISSOURI DEPARTMENT Or CONSERVATION LUSTRATIONS BY PETE SMITH TEXT Y STEVE BRIGMAN / NEWSLEADER Chesapeake Creek Walleye production at the The life cycle of walleye restocked by the Chesapeake Hatchery Chesapeake Hatchery Restocked lakes "On Bull Shoals, our stocking has increased," Pratt said. "The last few years we have been stocking 264,000 walleyes into Bull Shoals. But this year due to our recent tagging study, we bumped that up to 352,000 fingerfings. On Norfork, we will put 220,000" Studies indicate that by age 3, male walleyes in Bull Shoals will be more than 18 inches long and females wll be more than 20 inches Springfield Hatchery Collect breeding adults Biologists with the Missouri Department of Conservation take a boat equipped with electro-fishing equipment out on Bull Shoals Lake in spring. The boat sends direct electric current into the water to momentarily stun the fish in its field. Biologists then collect the walleyes with nets. need to collect 2 million to 25 milion eggs. About 50 percent of those eggs will go on to become fry." in about 35 to 40 days, 30 percent to 40 percent of the fry will have grown into fingerlings of about 2 inches Warm spring weather can increase that growth rate Stocking and natural recruitment, or natural spawning. work in tandem to populate the lakes with walleyes. "According to a study done back in the early 1990s on Norfork, about 40 percent of the population is made up of stocked fish" Pratt said. We are in the process of determining that rate on Bull Shoals. In a couple of years, we will have some answers." Chesapeake Fish Hatchery It was a weary-eyed group of fisheries biologists and resource technicians that gathered for an 8 am. meeting at the Missouri Department of Conservation's Chesapeake Hatchery. Most had been out through the wee hours of the morning for the mid-March gathering of walleye eggs from Buls Shoals Lake AJ Pratt, fisheries management biologist who oversees Bull Shoals and Norfork lakes, among his other duties, had been pikloting the boat that shuttled walleyes from the two electro-fishing boats back to the shore where they would be spawned or put in a tank truck for transport back to the hatchery. The shocking boats were targeting the area near the dam below Lake Taneycomo. They will make a traditional spawning run, and we try to intercept them when they get up into that area," Pratt explained. "We want to collect enough females and males to meet our stocking needs for the year" "Ideally, we would like to collect those females that an spawning. or releasing their eggs. That way we don't have to take them to the hatchery and hold them. That just Water output Hold ponds Collecting the eggs Biologists rub their fingers along the walleye's abdomen toward the tail to get them to release their eggs or sperm. Sperm from three males is mixed with eggs of each female to ensure genetic diversity and fertilization. The eggs are then mixed with a fine clay to prevent them from sticking together. Branson are Table Rock Lake MISSOURI adds additional stress to them." About 50 females were collected this year, which will yield from 50,000 to 200,000 eggs each. "What we are shooting for is 572.000 fingerlings. You ARKANSAS Bull Shoals O, Lake - Chesapeake Spring i Norfork Lake The Chesapeake Spring is diverted and pumped to supply all of the Water supply hatchery's water needs. The water is then returned to Chesapeake Creek 10 miles -Steve Brigman Moving the remaining adults Not all females are ready to spawn when collected. The remaining walleyes are put into hauling tanks on a flatbed truck and taken to the Chesapeake Hatchery. They may be given hormones and then spawned at the hatchery several days later. Laboratory and offices A fully equipped lab is maintained on-site to effectively monitor the walleyes' development and make sure that expected hatching rates are being achieved. The 'McDonald jars' The fertilized eggs are placed in a McDonald jar for incubation. The jar pumps cold water directly to the eggs, providing them with the necessary circulation and orygen. The eggs will take from 13 to 15 days to hatch. Slow development As the eggs mature, they will soon turn a brown color. They are initially treated with a formalin' to prevent fungus from preying on the eggs. The white spots in the image at left are eggs that died from fungus. Each quart in the jar contains about 110,00 to 120,000 eggs. Gravity drains water out of each tank row and it flows out of the building through channels in the floor The fry stage After the eggs hatch they enter the fry stage. The fry will use their recently developed tails to swim and let the current carry them over the lip of the McDonalds jar' and into a holding bucket. The buckets are then moved to a separate incubation area where the fry will be monitored for four to five days. Fry holding tanks Adult fish holding tanks Egg incubation jars This is where fertilized eggs spend their first two weeks. They are carefully monitored for their development and biologists work constantly to prevent the eggs from succumbing to parasitical fungi. Take a visit The hatchery is open 8 am. to 4:30 p.m. Monday through Friday. To schedule a tour, call 466-3421. Fry live off the yolk sac during their time in the tanks. They are given time to let their mouth parts develop more so they can feed on their own. The fry are about the length of an eyelash when they are transferred into the rearing ponds that have been prepared for them. Female walleyes that weren't ready to spawn when they were captured at the lake are kept in these tanks. Each fish is kept separate from the others to deter the species' cannibalistic tendencies when interacting with smaller fish. Water supply- Overflow aquarium The holding ponds The outdoor ponds must be stocked with alfalfa meal before the fry can be moved. This encourages the growth of microscopic phytoplankton, which encourages the growth of a zooplankton called daphnia, which is the basis of the fry's food supply. When the pond is ready. the fry are carried to the ponds in plastic bags 2005 total hatcheries output: Holding tank Water supply Filter to prevent escape Walleye Channel catfish Largemouth bass Bluegill Hybrid sunfish Striped bass White crappie 1.370,850 332,206 195,378 537,594 22506 25,737 9,000 4,605 3,310 Growing strong The fry will live in 10 ponds at the hatchery for about 35 to 40 days. When they reacha length of 2 inches, they will be loaded on trucks to restock Bull Shoals and Norfork lakes. At the end of the season Chesapeake Hatchery will have produced about 35 million walleyes Water supply Screen dividers "McDonald jar "McDonald jar Paddlefish Muskellunge MAP SOURCES: ESRL TELEATLAS MAGE SOURCES STEPHEN BRIGMAN MISSOURI DEPARTMENT Or CONSERVATION LUSTRATIONS BY PETE SMITH TEXT Y STEVE BRIGMAN / NEWSLEADER Chesapeake Creek

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shared by petesmit on Sep 27
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An infographic that describes the workflow and layout of a fish hatchery, its location and a description of the process for stocking lakes and rivers with fish.

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