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Thursday, July 14, 2011

Fishing Spiders

Jeff Hahn

Photo 1: Typical fishing spider. Note its size.

Jeffrey Hahn, Assistant Extension Entomologist

Spiders have been very common in and around homes lately. One type that has been particularly conspicuous is fishing spiders. Fishing spiders belong to the family Pisauridae (which also includes nursery web spiders). They are the largest spiders in Minnesota with a body length up to one inch long. Including the legs, they can be as large as several inches across. They are sometimes confused with wolf spiders to which they are very similar in appearance.

Fishing spiders are generally brownish and can have stripes on the body and chevron markings on the abdomen. However, color is not a good method to identify fishing spiders. You can partly do it by size. Another way is to look at the eyes. Like other spiders, fishing spiders have eight eyes which are arranged in two rows of four. As you look straight at the face of a spider, the bottom row (called anterior eyes) is straight or slightly upturned while the top row (called the posterior eyes) is strongly curved. The center two eyes of the top row (called the posterior medial eyes) are little larger than the others.

Jeff Hahn

Photo 2: Close up of fishing spider face. Note the pattern of the eyes.

Fishing spiders are associated with water, such as ponds or lakes, where they feed on a variety of insects, as well as tadpoles and even small fish. They capture prey by sitting on aquatic vegetation or surfaces near water and wait motionless with their legs outstretched for something to swim by. Although they don't construct webs, they do use their silk to attach several leaves together to form a nursery for the egg sacs. Although you typically find fishing spiders near water, one commonly encountered species, Dolomedes tenebrosus, can be commonly found 100 yards or more away from water.

Despite their size, fishing spiders are not aggressive to people and rarely bite (and if they do, it is typically because they are mishandled or feel threatened, like getting accidentally trapped under clothing). Any bites do not hurt any worse than mild bee stings. There is no need to control fishing spiders. If you find one outside, just ignore it. If one accidentally enters your home or other building, just capture it in a jar and release it outside.


  1. thank you for the nice help on my fishing spider report i'm a 4th grader still working on this so much thank you. you were very helpful to me

  2. This comment has been removed by a blog administrator.

  3. The section on the bites was helpful

  4. The section on the bites was helpful

  5. I was bitten by a Dolomedes Tenebrosus on a river cat-fishing trip. It had gotten trapped under my shirt sleeve. The pain was not bad, and I concur, it felt like a mild bee sting. The pain pulsates and lasts for like 20-30 minutes. I did, however, exhibit a large local reaction. The rash went from my underarm to the top of my elbow within two hours. It burned and itched simultaneously. It also tingled with goose bumps. Within 24-48 hours, the rash moved to my mid forearm. The itching was severe and I could feel heat from the rash. I took Benadryl and used an ice pack. The ice pack proved great relief from the itching, and by the 3rd day, the rash dissipated. The experience was very alarming. What I did notice was like 5-6 dry bites on my underarm area. This makes me believe that the spider only envenomated me as a total last resort. This is why the Dolomedes is now my favorite spider. It's really a gentle giant of the spider species, and they are so dynamic and fascinating. Suffice to say, I will be wearing long sleeves on my next river fishing expedition!!!

  6. I have 100's in my creek. I was alwYs worried they were harmful


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