An Alabama study on red snapper in the Gulf of Mexico is working to prove that the fish are more plentiful than previously thought.
Graduate student Kevin Gregalis deftly manipulated the switches on what many would mistake for a game controller to a Nintendo or Xbox. But this was no game.
Gregalis was maneuvering a Remotely Operated Vehicle with a camera tethered to the equipment aboard the Lady Ann charter boat.
As the ROV gently glided near the bottom in 85 feet of water, a familiar site soon popped up on the screen. A red snapper peered curiously at the approaching machine and then continued its foray into the depths in search of a meal. Snapper after snapper soon showed up on the screen as the ROV approached the target, one of the 100 obsolete battle tanks deployed off the Alabama coast in the mid 1990s as part of the Tanks to Reefs program.
Capt. Mike Thierry, who has been ferrying marine scientists and graduate students on these excursions out of Dauphin Island for the past 20 years, said you really don’t know “the rest of the story” until you put a camera down on a reef.
“One time today my fish finder was lit up with fish and we weren’t catching many,” Thierry said. “Then we dropped the camera down and sure enough they were there. You don’t know whether a school of baitfish had just come through or what. At some spots, they were as hungry as could be, so there may not have been any baitfish by there in a while. There are so many variables that you can’t see. When you’ve got 10-12 people standing around on the dock, not all of us are hungry. But if we were starving to death, we’d all be fighting over something to eat.
With a 40-day red snapper season that started on June 1, Dr. Bob Shipp, head of Marine Sciences at the University of South Alabama, and his graduate students want to see how the recreational snapper season impacts what are commonly referred to as “public” spots like the tanks.
“With the snapper season being so short and so many questions about the health of the snapper stocks and how accurate the stock assessments are, what we’re doing is sampling some of the artificial reefs off Alabama,” Shipp said. “These are public reefs. The numbers are published. Everybody knows them. They’re 12-14 miles offshore, which means easy access.
“We’re using video and regular hook and line to sample these reefs now before the season opens. When the season is over, we’ll come and sample them all again to see what kind of impact this very short season has. We’ll see if they’ve been cleaned off or whether they are in good shape and can stand a little more pressure.”
Shipp said that the trip on May 18 included a sampling of five tanks and an old barge, called the Buffalo Barge, near Gulf Shores. Shipp also said some of these tanks have been identified as possible sources of diseased fish after the Deepwater Horizon oil spill.
“We have been sampling these public reefs on a pretty regular basis, and we have not picked up a single incident of a fish with any kind of anomaly,” he said. “In addition to that, we put the camera down. It’s a very high-tech camera and we haven’t seen anything of concern. We probably caught 200 snapper today and we didn’t see any lesions or anything.”
Shipp said when the red snapper research began more than 20 years ago, a tagging study was done to determine whether red snapper moved from reef to reef or called one reef home, more or less. Current research is funded through the Alabama Marine Resources Division utilizing Sport Fish Restoration funds.
“It turns out snapper generally will stay at the same site or close to it, unless they are impacted by a major tropical storm,” he said. “Then they’ll disperse. That led to some other studies. We’ve had a number of graduate students who have gotten degrees doing this research. The current head of the Florida Fish and Wildlife Conservation Commission Division of Marine Fisheries Management is Jessica McCawley, one of our students. She did a master’s thesis on red snapper feeding habits.
“We’re doing a study now on how deep you can bring a snapper up, release him and have him survive. The prevailing theory was that, after you get deeper than 70 to 80 feet, they’re not going to survive. But we’ve got a half-dozen stations in 150 feet of water, and we’ve been tagging them for three or four years. We’ve recaptured a number of those fish. As long as the fish are vented (releasing gases from the swim bladder) and are not gut-hooked, they have a pretty high chance of survival.”
Shipp said the recent outing in the Gulf to check the tanks provided additional confirmation of his theory that there is an abundance of red snapper off the Alabama coast, and along other Gulf coasts such as Texas.
“Our very well known artificial reefs are holding a tremendous amount of snapper,” he said. “We’ve got a lot of young snapper, and we’ve got a lot of large 12- to 14-pound snapper out there. You know there are between 10,000 and 20,000 reefs out there in our reef permit zones. Do the numbers. If each reef holds 500 to 1,000 pounds of snapper, imagine how many red snapper live off Alabama in our artificial reef zones. The reefs combined with the petroleum structures in the north central and northwestern Gulf is where 70 percent of snapper are landed now, both recreationally and commercially. These snapper come from areas that produced practically no snapper at all historically.”