TPWD News Release — Feb. 19, 2013
ATHENS—Toyota ShareLunker entries came from three East Texas reservoirs within the last week.
February 14 Thomas McCraven of Gladewater caught Toyota ShareLunker 542, a 13.23-pounder from Lake O’ the Pines. McCraven caught the fish in six feet of water in Allen Creek using a Baby Brush Hog. The fish was 24.75 inches long and 21 inches in girth. It was held for pickup at Johnson Creek Marina, an official Toyota ShareLunker Weigh and Holding Station.
The next day, Toledo Bend Reservoir gave up a 13.06-pound bass to Casey Martin of Anacoco, Louisiana, who was fishing the FLW Everstart tournament. Martin’s fish, now Toyota ShareLunker 543, was 26 inches long and 21 inches in girth. Catch details were not revealed.
On February 19 Mark Hall of Winnsboro pulled a 13.11-pounder, Toyota ShareLunker 544, from Lake Fork. Hall was fishing for crappie when they stopped biting. “I know from experience that when the crappie stop biting, it’s because bass have moved in and starting feeding on them,” he said. Hall quickly switched to a swim-bait, and the big bass smashed it right at the surface on the retrieve.
Hall’s fish is the eighth to be entered into the ShareLunker program during the current season and is Lake Fork’s third entry of the season.
Toledo Bend has now produced six ShareLunkers, the last having come from the lake in 2012.
McCraven’s fish is the third to come from Lake O’ the Pines. The lake produced two ShareLunkers in 2010.
“Lake O’ the Pines has always produced some good quality bass,” said Tim Bister, the TPWD Inland Fisheries biologist who manages the lake’s fishery. “The ability for a reservoir to produce big fish is related to good population genetics and abundant prey fish. Shad and sunfish are abundant in Lake O’ the Pines, and are the main food source for bass in this reservoir.”
Florida largemouth bass fingerlings were stocked into Lake O’ the Pines by TPWD periodically from 1982 through 2000 and more recently in 2009, 2010 and 2011. “These stockings have really helped to develop the quality largemouth bass population in the reservoir,” Bister said. “Genetic testing of the largemouth bass population in 2013 found 3 percent of the fish sampled were pure Florida largemouth bass. All other fish in the sample contained some Florida bass genetics.”
The total number of entries into the Toyota ShareLunker program for the current season now stands at eight with the traditional peak of entries still to come. More ShareLunker entries have come in March—230 of the 544—than in any other month.
All three recent catches are currently being held at the Texas Freshwater Fisheries Center (TFFC) in Athens awaiting the results of DNA testing. Only fish that are pure Florida largemouth bass are used in the ShareLunker selective breeding program. Each lake that contributes an entry during the season receives a share of the fingerlings produced.
Fish that are not pure Florida are returned to the lake as soon as possible. The fish is still an official entry into the Toyota ShareLunker program, and the angler receives all program awards.
“We have a sound scientific basis for spawning only pure Florida largemouth bass,” said TFFC director Allen Forshage. “For a full explanation, see the information from TPWD geneticist Dijar Lutz-Carrillo in the sidebar ‘Why Spawn Only Pure Florida Largemouth Bass.”
Anyone legally catching a 13-pound or bigger largemouth bass from Texas waters, public or private, between October 1 and April 30 may submit the fish to the Toyota ShareLunker program by calling the ShareLunker hotline at (903) 681-0550 or paging (888) 784-0600 and leaving a phone number including area code. Fish will be picked up by TPWD personnel within 12 hours.
Anglers entering fish into the Toyota ShareLunker program receive a free replica of their fish, a certificate and ShareLunker clothing and are recognized at a banquet at the Texas Freshwater Fisheries Center in Athens.
For complete information and rules of the ShareLunker program, tips on caring for big bass, a list of official Toyota ShareLunker weigh and holding stations and a recap of last year’s season, see tpwd.texas.gov/sharelunker. The site also includes a searchable database of all fish entered into the program along with pictures where available.
Information on current catches, including short videos of interviews with anglers when available, is posted on www.facebook.com/sharelunkerprogram.
The Toyota ShareLunker Program is made possible by a grant to the Texas Parks & Wildlife Foundation from Gulf States Toyota. Toyota is a long-time supporter of the Foundation and Texas Parks and Wildlife Department, providing major funding for a wide variety of education, fish, parks and wildlife projects.
By Dijar Lutz-Carrillo, TPWD Geneticist
Given recent events I thought it would be a good idea to reiterate why the ShareLunker and Operation World Record programs are operated in their current fashion, specifically, why hybrid ShareLunkers are not included in hatchery spawning events.
We should start by noting that hybrids are included in ShareLunker spawning events when non-introgressed Florida largemouth bass ShareLunkers are not available. This has been done in the past and will continue in the future. No one is of the opinion that hybrid largemouth bass cannot reach a large size, even a state or world record size. Nor does anyone think there isn’t something special about the genotype of a hybrid largemouth bass that reaches a trophy size. However, one purpose of the ShareLunker and Operation World Record programs is to produce offspring that will reach large size. The use of non-introgressed Florida largemouth bass in the breeding programs enhances this probability.
The reasons for this are both theoretical and tangible. Size, not just in largemouth bass but in humans, mice, and everything else, is a quantitative trait that results from interactions between the genotype and the environment. The phenotype of size is the result of actions and interactions at and among hundreds to thousands of loci, each accounting for a fraction of a percent of the overall variance. The genetic contribution to this variance can be partitioned into three types—additive, dominance, and epistatic. While both a hybrid largemouth bass and a Florida largemouth bass will pass on the additive genetic components (or a portion of them) to their offspring, the epistatic and dominance configurations (or similar configurations) are more likely to be realized in the offspring of a non-hybrid cross.
The tangible evidence can be seen in our reservoirs. If you could roll all of our reservoirs into one big water body to create a “typical” Texas reservoir, 5 percent of the fish would be Florida largemouth bass and 90 percent of the fish would be hybrids. However, among all ShareLunker entries, 50 percent of these fish are Florida largemouth and 50 percent are hybrids. That means that 5 percent of the population (Florida largemouth bass) is responsible for 50 percent of the ShareLunkers, and 90% of the population (hybrids) is responsible for the other 50 percent. Given two fish, one a Florida largemouth bass and one a hybrid, the Florida largemouth bass is about 10 times more likely to reach a size of 13 pounds or greater.
Spawning a hybrid donated to the ShareLunker program and stocking out its offspring does not, by itself, hurt anything. However, TPWD has limited staff, time, spawning capacity, and pond rearing space for dealing with “special” fish, and those resources are best used by incorporating non-introgressed ShareLunkers into the spawning program. This increases the frequency of non-introgressed Florida largemouth bass in the population as well as the probability of producing offspring that will themselves reach trophy size. There will always be plenty of hybrids even if we never cross them.