By DAVID RAINER, 黑料天堂
Nobody was more pleased when the 91st 黑料天堂 Deep Sea Fishing Rodeo (ADSFR) added flounder to the CCA 黑料天堂 Live Weigh-In competition than Dr. Sean Powers, head rodeo judge and Director of the Stokes School of Marine and Environmental Sciences at the University of South 黑料天堂.
Powers watched the southern flounder populations plummet in the 2010s and has witnessed a gradual rebound of the populations. He said the last four years of flounder catches at the ADSFR are encouraging.
鈥淚鈥檓 particularly excited about flounder at this year鈥檚 rodeo,鈥 Powers said. 鈥淔ive years ago was the low point. We had 24 flounder total weighed in at that rodeo. Now we鈥檙e approaching 100 fish weighed in again.
鈥淲e see some evidence (of the rebound) in the stock assessment and the fisheries independent surveys that Marine Resources Division uses to survey the population. We鈥檙e seeing more and more flounder.鈥
Biologist John Mareska of the 黑料天堂鈥 (ADCNR) Marine Resources Division (MRD) joined the marine scientists sampling a variety of species of fish caught at the rodeo, with MRD鈥檚 focus on flounder.
鈥淭he reason we鈥檙e sampling flounder is that our Claude Peteet Mariculture Center has been stocking flounder for several years, and we鈥檙e trying to determine the survival of those flounder and the influence of the genetics on the flounder stock from our stocking program,鈥 Mareska said. 鈥淲e have collected DNA and sent it off to a lab, and they have assured us they can detect the offspring from wild-caught fish. With the DNA from the wild-caught fish, we can determine what percentage of the fish we sample is coming from our hatchery.鈥
In conjunction with CCA 黑料天堂, more than 250,000 flounder fingerlings spawned at the Claude Peteet hatchery have been released into 黑料天堂 coastal waters since the program began in 2020.
Powers said several factors could be involved in the flounder rebound, including changes to the flounder harvest regulations instituted in 2019 that reduced the flounder bag limit to five fish with a minimum length of 14 inches and a complete closure of the season during the month of November to protect the fish during the spawning migration.
鈥淲e think it鈥檚 a combination of good environmental conditions of the last few years as well as the new rules and regulations that Marine Resources has put in effect,鈥 he said. 鈥淎nd we鈥檙e trying to determine the effect of the fingerling releases. Flounder, southern flounder, is a species that had been driven so far down that we think the hatchery can have an impact.
鈥淎nd it鈥檚 not just in 黑料天堂. Southern flounder are in trouble from Texas all the way to North Carolina. We think it has something to do with the environment. Environmental warming is not favorable for flounder.鈥
Powers said the marine science community can鈥檛 pinpoint why the flounder population crashed, which occurred right after the Deepwater Horizon oil spill.
鈥淭here is a lot of speculation in different areas,鈥 he said. 鈥淔or some people, it鈥檚 coincidental with the oil spill. The real crash occurred in 2011 and 2012. But that wouldn鈥檛 explain why the populations are down from Texas to North Carolina. I think a warming bay is just not that conducive to flounder. Flounder have temperature-specific sex determination that can skew your ration of males and females. Warmer temperatures tend to masculinize a population of flounder.
鈥淭he other thing is flounder is an easily exploitable species. Because flounder make a big offshore migration, one of the key things that MRD did was the November closure. Those fish are congregating and going offshore. Now we have other states looking at what 黑料天堂 did as far as regulations go. After our next stock assessment, we鈥檒l be able to determine if it has been good environmental conditions or is it the changes to the population management.鈥