River Monsters, a Texas Edition

October 29, 2019 • by Adam Cohen and Melissa Casarez
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turtle

Alligator Snapping Turtle (Macrochelys temminckii):

Imagine our surprise when we seined up this brute just south of Texarkana. We thought it was a rock at first until we heard it exhale. These are sit-and-wait predators that rarely move, wriggling a tongue that looks like a worm to attract fish prey. The brown stuff just in front of its eye is a mass of leeches struggling to get to a soft spot where the blood can be easily accessed.

gator

American Alligator (Alligator mississippiensis):

We found this little guy hanging out in a flooded wheel rut under the I-10 bridge over the Trinity River just east of Houston. It was probably feasting on trapped fish. A few months later crossing this area we found one dead on the road that we estimated to be over 10 feet long.

snap

Common Snapping Turtle (Chelydra serpentina):

Much more widespread than their commonly mis-identified for cousin (Alligator Snapping Turtle), common snapping turtles are often encountered - sometimes in pairs. We got these two, that were likely a mating pair, in the same haul.

softshell

Spiny Softshell Turtle (Apalone spinifera):

We periodically seine up softshell turtles, usually smaller than this one, but occasionally we run across monsters like this.  Note the neck length on these guys and why you really have to keep your eyes on them when handling.

longnose

Longnose Gar (Lepisosteus osseus):

One of the four gar species in Texas, we often come across large Longnose Gar when collecting below dams. They can get pretty large and have sharp, needle-like teeth.

bowfin

Bowfin (Amia calva):

These primitive fish that like to hang out in the sluggish backwaters, were likely once much further west than they are today. Today they occur in the US east of the Lavaca River in Texas. The males can be beautiful shades of green and blue and don’t get quite as large as these females.

snake

Watersnakes (Nerodia):

We often seine up or come across non-venemous, although likely to bite, water snakes such as this large Diamondback Watersnake (Nerodia rhombifer).

ictiobus

Buffalo (Ictiobus spp):

Buffalo are common throughout the state, but many people are surprised to know that these gentle giants, that feed on invertebrates and detritus, are all around them. The Bigmouth Buffalo (Ictiobus cyprinellus) like the one photographed here from the Sulphur River get to be very old and recently documented to live at least as long as 112 years (https://www.nationalgeographic.com/animals/2019/08/oldest-freshwater-fish-discovered-radiocarbon-dating/).

frog

American Bullfrog (Rana catesbiana):

American bullfrogs are fun to catch when they get this large. They can eat lots more than the small insects most people imagine when they think of frogs and will even cannibalize other bullfrogs. These are easily found at night with headlamps throughout most of the state.

leech

Leeches (family Glossiphoniidae)

Hated by many, Texas’ leeches are not likely to suck the blood of any human. The family of leeches photographed here (Glossiphonidae) are known to take care of their offspring and often leave their host when they have babies to care for. If you find one free-living (not on a turtle or other animal) it is likely with babies.

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