One of the films at the Drake Magazine FFT in Dallas, November 11, 2009

Time flies, and before you know it, it’s time again for the Drake Magazine Fly Fishing Film Tour to hit Dallas again. It seemed like I read somewhere that it was the second time through Texas for the Tour, but who really cares? If you are a fly fanatic, and like to be around other fanatics, why not start the evening of November 11 (Veteran’s Day) at Tailwaters Fly Fishing in uptown, and make your way over to the Magnolia for the show? You can purchase tickets in advance by following that link. DO NOT be surprised if this is a sellout.

So come on out and let them “fill your skulls with fish porn”. If you check out the tour site www.flyfishingfilmtour.com, it’s all over but the shouting.

The timeline for this update from TPWD was today, so I guess there is a change in the information that originally came out on 10/20. If you are as mystified by freshwater redfish as I am, this is one to bookmark for later use. The scientific aspects of an event like this are very interesting, and this can act as a reference for future events of this nature.

FAIRFIELD, Texas — September means at least two unpleasant annual natural phenomena in East Texas: ragweed is blooming and fish are dying at Lake Fairfield. Texas Parks and Wildlife Department (TPWD) Inland Fisheries management and Kills and Spills Team (KAST) biologists investigated a major fish kill on Fairfield Lake the second week of September.

Anglers fishing the lake the morning of September 13th noticed the dead fish and notified the TPWD 24-hour Communication Center at (512) 389-4848. Unlike previous kills, notification was received early enough that TPWD personnel were able to get to the scene while fish were still dying. This allowed them to collect fish that were stressed but not yet dead and take water samples in several areas of the kill.

Main locations of dead fish were along the shoreline of a cove immediately northwest of the dam to the spillway and in the cove south of the dam, but also extending up the shoreline to mid-reservoir. The fish appeared to have died no earlier than Saturday, September 12th.

TPWD personnel returned to the lake on Monday the 14th and Tuesday the 15th to collect water samples and conduct a thorough investigation and enumeration of the kill. Water quality field data were measured both in and out of the area where dead fish were observed. Dead fish were distributed along approximately 10 miles of shoreline. A series of detailed counts were conducted along approximately 0.75 miles of that shoreline to allow estimation of the total kill.

Water quality datasondes (electronic data gathering devices) were deployed in the northwest and south coves where the main kills occurred. These datasondes were able to collect temperature and oxygen concentration every 30 minutes for the following 14 days.

Water quality field data collected on Sunday the 13th indicated extensive areas of lower than normal oxygen and abundant phytoplankton (chlorophyll a) in the areas where the fish kill occurred. Using information on oxygen concentration from the datasondes, water quality data collected the day of the kill, and information on sunlight level from a local weather site, TPWD biologists began to piece together a theory on the cause or causes of the kill.

Normally photosynthesis (oxygen production) by phytoplankton during daylight hours increases oxygen concentration enough to compensate for respiration (oxygen use) by those same phytoplankton as well as bacterial decomposition at night. However, during periods of cloudy weather sunlight (measured as solar radiation) is reduced; oxygen consumption remains high but oxygen production is greatly reduced. When cloudy weather lasts for several days and oxygen concentration falls below the minimum level to support aquatic life, fish begin to die.

A good rule of thumb is at oxygen concentrations below 5 milligrams per liter (5 mg/L) many species become stressed, and at concentrations below 3 mg/L most species can die from oxygen deprivation. These concentrations are also known as the daily mean and minimum dissolved oxygen criteria for high aquatic life use in the Texas Surface Water Quality Standards. Although oxygen levels may stay above the minimum level during the day, it only takes a few minutes below the minimum at night to be fatal to fish.

Cloudy weather in the Fairfield area began on Thursday, September 10th. By Saturday the 12th solar radiation was only 1/3 of the normal for that time of year, and fish began dying before dawn on the 13th. By the time KAST personnel deployed the datasondes on the afternoon of the 14th the sun had begun to break through the clouds, and oxygen levels had begun to temporarily climb back above 5 mg/L.

This reprieve was short-lived; cloud cover reduced solar radiation on the 15th, 16th and 17th and oxygen concentrations remained below the minimum level. By the 18th the weather pattern had improved and oxygen production in the north cove remained above the minimum level. Oxygen production in the south cove lagged several days behind due to its higher phytoplankton level, but by Sunday the 20th abundant sunshine was once again allowing phytoplankton to produce high levels of oxygen in both areas. Another short period of cloudy weather from the 22nd to the 25th reduced oxygen concentration again but was of short enough duration that no substantial fish kill occurred.

By combining oxygen data from the datasondes with solar radiation data from the weather station, TPWD biologists now had the critical information needed to understand the complex dynamics of the repeated kills at Lake Fairfield.

In September, water temperature and bacterial activity are still high but day length has been getting shorter incrementally since the summer solstice on June 21 (the date in the Northern Hemisphere when daylight hours are longest relative to dark). Extremely high phytoplankton levels due to high nutrient levels produce sufficient oxygen during sunny days to compensate for lack of production at night; however, when early fall cool fronts and cloudy weather limit solar radiation, oxygen levels drop rapidly and fish may die.

Initial estimates from the 2009 TPWD fish kill investigation indicated that nearly 1 million fish died compared to an estimated 7,345 that died in September 2008 and an additional 114,223 that October. However, the species distribution in the current kill was considerably different than in September 2008. In 2009, 96% of the kill (an estimated 875,793 fish) were threadfin and gizzard shad and 3.3% (an estimated 30,168 fish) were sunfish species; the remaining fewer than one percent were bullhead minnow, inland silverside, channel catfish, flathead catfish, yellow bullhead, largemouth bass, blue tilapia, and red drum. In the 2008 kill, 51% were large red drum with an average length of 32 inches.

Water samples and tissue samples from live but stressed fish collected during the day of the kill have not shown the presence of any toxicant that could be responsible for the kill.

TPWD has stocked more than 5.3 million red drum in Lake Fairfield since 1984, and despite the estimated 3,750 red drum lost in the 2008 kill and the far lesser number lost in the present kill, anglers fishing the lake report excellent success for this popular fishery. Anglers spent over 9,000 angler hours seeking red drum at Lake Fairfield from September 1, 2008 through May 31, 2009, accounting for over 47% of the directed effort; angling continued during and after both fish kills.

The TPWD Kills and Spills Team is a group of biologists who respond to pollution reports or natural incidents that threaten state fish or wildlife resources. If you see dead or dying fish or wildlife or pollution threatening fish and wildlife, please contact the 24-hour Communication Center at (512) 389-4848, or contact your local game warden. Additional information about KAST is available at http://www.tpwd.state.tx.us/texaswater/kast/pages/homepage.html.

Questions about the Fairfield Lake fishery should be directed to District Biologist Richard Ott at (903)-566-2161, richard.ott@tpwd.state.tx.us.

I am getting e mails from friends along the coast about the Red Tide being on the increase down south. Here is the report from Texas Parks and Wildlife.
Current Status

October 22, 2009

Aerosols have decreased today at Mustang Island State Park south of Port Aransas. Last night’s high tide cleaned off the beaches a bit, pushing the dead fish from the shoreline back to the dunes. This morning fresh dead fish began washing ashore along the beaches, including finger mullet and small ladyfish; old dead fish that likely died offshore are washing in as well. A reddish foam can be seen in the surf but it is unclear whether this is due to the red tide.

Several sites were visited around the South Padre Island area today. Red tide cell counts remain relatively high from south of Port Mansfield to the beaches in town, where aerosols were noticeable this morning. Fresh dead fish continue to wash up along the beaches. Additional dead fish have been seen floating in the lower Laguna Madre north of the Queen Isabella Causeway, though it is possible that these were brought in with the tide through Brazos-Santiago Pass.

Aerosols were also noticeable at Port Isabel yesterday afternoon.

A cool front approaching the coast today will shift winds from the southeast to the north. This could lessen aerosol symptoms for beachgoers and possibly keep the red tide from moving any further north along the coast.

Reports from Mexico indicate that the red tide extends south to La Pesca, but not as far as Soto de Marina. The state of Tamaulipas has closed shellfish harvest from the Rio Grande to Tampico. The road to the beach at Playa Bagdad (Washington Beach) is closed to traffic because of the red tide.

October 21, 2009 afternoon

Texas Parks and Wildlife staff were out on the water today in Corpus Christi, Port Mansfield and South Padre Island.

The team working Corpus Christi Bay near Naval Air Station Corpus Christi reported throat irritation and coughing due to the red tide aerosols but saw no discolored water or dead fish.

A second team surveyed the back side of Mustang Island, Packery Channel, the JFK Causeway area and the Upper Laguna Madre along the Intracoastal Waterway. Aerosols were milder than they have been in recent days and no fresh dead fish were found in Packery Channel or along the back side of southern Mustang Island. Some of the homeowners’ canals along the Upper Laguna Madre and near the Whataburger on Padre Island were visited as well; aerosols were found but no fresh dead fish.

The third team was dispatched to the Port Mansfield area. Mild aerosols and stressed gizzard shad were encountered in the lower Laguna Madre near Port Mansfield. A small fish kill was investigated along the northern shore of Mansfield Pass that was comprised of hardhead catfish, mullet, spot croaker, and spotted seatrout. Densities were approximately 30 fish per 15 yards. Large numbers of birds feeding on the dead fish in the pass.

Moderate aerosols and cell counts continue to be found along the South Padre Island beaches and at the windsurfing flats. Many of the fish that were stranded yesterday along the beaches up to the Mansfield Pass appear to have been picked up by the tide and moved south. No fresh dead fish were found along the beaches today.

-To read the Red Tide Status Report-