Passport to Texas

Feral Hogs at the Kerry Wildlife Management Area

The "Cure" for Feral Swine Play Now | Play in Popup | Download

This is Passport to Texas

It’s ironic that sodium nitrite, a preservative used in sausage-making, might one day aid in the control of feral swine in Texas.

11- Sodium nitrite gives cured meat a red color, improves the flavor; we eat it all the time in bacon, ham and any cured meat.

Biologist Donnie Frels works out of the Kerr Wildlife Management Area. Sodium nitrite can reduce the blood’s ability to carry oxygen throughout the body. Humans and most mammals have an enzyme which efficiently reverses this process: swine cannot.

10- We are attempting to take advantage of that and exploit that in order to use sodium nitrite as a possible control measure in feral swine.

Exotic feral hogs compete with native wildlife for food and destroy habitat. Researchers are working with professional chemists to stabilize the sodium nitrite so they can successfully place it into a “bait matrix”.

12- Which can then be used in a specific feeder which only hogs can gain access to. That way we ensure that other non-target animals are not exposed to the toxicant bait.

Researchers at the Kerr have been investigating sodium nitrite as possible control for feral swine since 2010 (in a secure 12 acre research facility); while it looks promising, Frels says it may be several more years before an effective toxic bait is available commercially.

The Wildlife Restoration Program supports our series.

For Texas Parks and Wildlife…I’m Cecilia Nasti.

Zebra mussels

Beating Down Zebra Mussels in Lake Waco Play Now | Play in Popup | Download

This is Passport to Texas

In September 2014, when City of Waco employees found zebra mussels near a boat ramp in Lake Waco, Texas Parks and Wildlife, the City of Waco, and Texas Army Corps of Engineers moved quickly to stop this non-native aquatic invasive in its tracks.

06-The City of Waco ordered up tarps, they hired commercial divers, set the plan, and last fall we put ’em all in place.

Brian Van Zee, Inland Fisheries Regional Director, says there wasn’t time to obtain permits for chemical treatments, so divers and staff positioned the eight thick, rubber tarps on the lake bottom over the infested area to block sunlight and oxygen below.

15- We just recently pulled those tarps from lake Waco, and it was really looking very good; we could tell by the condition of the tarps– underneath them–that we had reached anoxic conditions. You could smell the hydrogen sulfide smell and these black conditions you typically see when you have anoxic conditions.

Although divers found two live zebra mussels on rocks they brought up, Van Zee is optimistic.

14-Maybe we knocked back the number of zebra mussels that were in that area, far enough to where they cannot create a viable, reproducing population. We don’t know if that’s the case or not. We really won’t know probably until this spring or summer, actually; maybe even next fall.

Until then, all partners will continue to monitor the lake and enforce the clean, drain and dry law for all boaters. Learn more on the TPW website.

The Wildlife and Sport Fish Restoration program supports our series. Learn about combating zebra mussels and other aquatic invasives at texasinvasives.org.

For Texas Parks and Wildlife…I’m Cecilia Nasti.

Clean, drain and dry your boats to prevent the spread of zebra mussels.

Combating Zebra Mussels in Lake Waco Play Now | Play in Popup | Download

Before zebra mussels appeared in Lake Waco, Texas Parks and Wildlife, the City of Waco and the Army Corps of Engineers worked on ways to prevent an infestation, which involved close monitoring of arriving vessels.

06–They city hired summer interns to conduct boater education and boater surveys and inspections, in an effort to try and prevent the introduction [of zebra mussels] to Lake Waco.

Brian Van Zee, Texas Parks and Wildlife Inland Fisheries Regional Director, says despite their best efforts, in the summer of 2014, a vessel previously in zebra mussel infested Lake Belton evaded their scrutiny and launched in Lake Waco. In September, City of Waco employees found zebra mussels near the boat ramp. And everyone mobilized.

27– [We thought] if we can act quickly, before the water temperature begins cooling down in the fall again, we might be able to get on top of these things. And, we had heard and seen studies where they had used these big, heavy, thick pond liners and covered an area; and you can suffocate them [zebra mussels]. So, we knew that we could get approval from the Corps of Engineers to install those and get that done pretty quickly, So, the City of Waco ordered up the tarps, they hired commercial divers, set the plan, and last fall we put ’em all in place.

Brian Van Zee shares the results of their efforts tomorrow.

The Wildlife and Sport Fish Restoration program supports our series. Get  more information about zebra mussels at texasinvasives.org.

For Texas Parks and Wildlife…I’m Cecilia Nasti.

Zebra Mussels

Zebra Mussels Come to Lake Waco Play Now | Play in Popup | Download

Non-native zebra mussels pose potential ecological and economic damage wherever there’s an infestation. In September 2014, they showed up in Lake Waco.

06-Unfortunately there was a vessel that was launched on Lake Waco last summer; it had come from Lake Belton.

Brian Van Zee, Texas Parks and Wildlife Inland Fisheries Regional Director, says Lake Belton has an established population of zebra mussels; they hitched a ride to Lake Waco on the vessel in question.

15- It was heavily infested with those individuals when they left Lake Belton. They did not inspect it; they did not clean it. So, they launched on Lake Waco and introduced these mussels to the lake.

The zebra mussel larvae are microscopic, which is why it is imperative boaters clean, drain and dry their vessels when going from one water body to the next.

24-Texas Parks and Wildlife department enacted the law last year requiring boaters–anytime they leave or approach a freshwater lake or river system in the state–their boats have to be dry. And that’s all aimed at preventing the spread of these microscopic organisms. So, take those three simple steps of clean, drain, dry; it doesn’t take long. It’s very simple to do. It’s better for your boat in terms of maintenance, anyway; so go ahead and do it.

What Texas Parks and Wildlife, the City of Waco and Army Corps of Engineers is doing to combat zebra mussels in Lake Waco–that’s tomorrow. Learn more about zebra mussels at www.texasinvasives.org.

The Sport Fish Restoration program supports our series.

For Texas Parks and Wildlife–I’m Cecilia Nasti.

Giant Salvinia overtaking Lake Conroe

Aquatic Invasives Play Now | Play in Popup | Download

This is Passport to Texas

Giant Salvinia…tilapia…zebra mussels… are just three of the many non-native, invasive aquatic species threatening Texas rivers and lakes.

11-As a whole, anytime you get an invasive species into the state–whether it be a new one or one we are currently dealing with–they certainly cause a lot of economic as well as environmental negative impact.

Brian Van Zee is a TPW Inland Fisheries Regional Director.

15- When an invasive species gets introduced into a new system, they typically have very few predators or natural control mechanisms in place. So, they are able to take over and dominate those systems; that just creates a lot of problems for a lot of our native species.

Giant salvinia quickly creates huge, thick mats of vegetation on lakes, reducing light penetration that results in oxygen depletion; tilapia outcompete native fishes for food, thus threatening their populations; and zebra mussels adhere to municipal water intake pipes,
blocking water flow, and costing cities millions of dollars in repairs and maintenance.

05-We have seven lakes in the state that have confirmed zebra mussels in them.

Brian Van Zee returns tomorrow to talk about the latest zebra mussel infestation and how it happened. Learn more about aquatic invasives at www.texasinvasives.org.

The Sport Fish Restoration program supports our series and works to increase fishing and boating opportunities in Texas.

For Texas Parks and Wildlife…I’m Cecilia Nasti.