The largest true (“non-tarantula”) spiders that most folks in the USA will ever encounter, Fishing Spiders are at once fascinating and a bit intimidating. This is especially so for egg-guarding females, who may prefer to fight rather than flee when disturbed. I recently came across one such female below a dock, while accompanied by my 5 ½ year old nephew. Thanks to my long career as a zookeeper, the little guy has been up close to a huge array of animals since infancy, and especially favors spiders. After locating the spider, we swam out from beneath the dock to plan our capture strategy. Noting my sidekick’s smaller size, and the fact that he has handled snakes longer than himself, I suggested that he go back and collect it, as the area was cramped. “No way, man” was all he said!
But ferocious appearances aside, Fishing Spiders make great terrarium inhabitants. Due to their size and boldness, they are very easy to observe as they catch fish, walk on water and care for their eggs and young. I’ve never understood why more spider enthusiasts have not taken an interest in them… perhaps this article will change some minds!
Tarantulas are not the only Vertebrate-Eating Spiders
Most folks know that large tarantulas sometimes catch small lizards and other vertebrates, but among the true spiders this strategy is relatively unstudied. A recent survey of the subject, published in the June 18, 2014 issue of Plos One (please see link to article, below) revealed that at least 18 species in 8 families feed upon fish. Despite being small and slightly built by tarantula standards, Fishing Spiders, aided by vertebrate-specific neurotoxic venom, can take prey that exceeds their own weight 5-fold.
North America is particularly rich in Fishing Spiders, most of which are classified in the family Pisauridae. Eleven family members are documented fish-catchers, and others may do so as well. Also known as Nursery Web Spiders, some live far from water and eat insects, while others move between aquatic and terrestrial habitats.
The Dark Fishing Spider
My favorite is the Dark Fishing Spider, Dolomedes tenebrosus, which ranges from southern Canada west to North Dakota and south to Florida and Texas.Females measure over 1 inch in body-length, and their legs span 3+ inches. The grayish-brown body is marked with black, and the legs are banded, but individuals vary.
Maternal Care of Eggs and Young
Female Dark Fishing Spiders carry their egg cases, which may contain up to 1,400 eggs, suspended between the chelicerae (fangs), pedipalps, and spinnerets (large wolf spiders, which resemble fishing spiders, carry their eggs at the rear of the body, attached to the spinnerets).
Egg-guarding females that I collect in July often produce a second fertile egg case in September. Those I’ve kept near an east-facing window regularly basked in the morning sun with their egg cases, and then took shelter as temperatures rose.
At the end of the incubation period, the female constructs a web in which she suspends the egg mass…hence the alternate name, Nursery Web Spider. She stays with the hatchlings for awhile, defending them against predators. My females refused food at this time, but would rush out and “push” crickets that ventured near the web, and would strike at forceps placed in their vicinity.
Dark Fishing Spider eggs hatch from July to September. Outdoors, the young hibernate during the winter and become sexually-mature by the following May-June.
Hunting and Fishing
Fishing Spiders employ varied hunting techniques. Mine leap at moths, chase down crickets with blinding speed and, most amazing of all, snare guppies and minnows from beneath the water’s surface. In large, planted terrariums, most split their time between lying in ambush on bark slabs and “fishing” at the water’s edge.
Anecdotal reports suggest that some Fishing Spiders lure fish to the water’s surface by wiggling a leg in imitation of an insect. I don’t believe this has been definitely documented (please write in if you know otherwise), but the theory is a fascinating one. When hunting at the water’s edge, they anchor the rear 6 legs to a dock, plant or rock and keep the front legs on the water’s surface. Fish, tadpoles or insects that disturb the surface are instantly attacked, with the spiders moving out over the water for several inches if necessary. Flying insects that fall onto the water likely comprise the bulk of their diet in most habitats.
Along the Delaware River, I’ve also observed Fishing Spiders standing on the water’s surface, 1-2 feet from the shore, after dark. They are unaffected by a weak flashlight beam, and, much like over-sized water striders, quickly “skate” over to grab insects that I toss in their vicinity. They can also dive and swim below the surface, but I’ve yet to observe this personally.
Fishing Spider Care
Caution: Although Fishing Spiders are not considered to be dangerously venomous, they are fast and will not hesitate to bite. We know little about spider venom, and the possibility of an allergic reaction must be considered….please do not touch any spider with bare hands. Be sure to check your spider’s location before opening the terrarium, as they are incredibly fast.
Dark Fishing Spiders do fine in simple terrariums, but show themselves to their best advantage if provided plenty of space, live plants, upright cork bark slabs and a small pool of water. I use large battery jars or 5-10 gallon aquariums which have a water area created by attaching a panel of glass to the aquarium’s sides with silicone. Complex terrariums allow the spiders to show off their impressive hunting skills, which are most evident when they leaping at moths or flies and snaring fishes.
Fishing Spiders are quite voracious. Captive females have even been observed feeding upon dead fish, and a photo in the article linked below shows one grabbing a bait minnow from a miscast fishing line (I once accidentally hooked a hawk in Venezuela, but this is the only “fishing for a fishing spider” incident I know of!).
Along with guppies and minnows, I offer wild-caught moths, grubs, tree crickets, caterpillars and such when possible, saving crickets and waxworms for the cooler months (wild adults expire in September-October, but captives can live well into January). Hatchlings will take fruit flies, springtails and “meadow plankton”. Small frogs, tadpoles, dragonfly larvae and even slugs have been documented as part of their diet in the wild.
Light, Heat and Humidity
I keep my Dark Fishing Spider terrariums very moist, but others have done well in dry set-ups with a daily misting. Hatchlings desiccate easily, and so should be kept in humid enclosures. Normal room temperatures suit them well. I’ve also kept several related species that frequent upland habitats…all have proven to be interesting, hardy captives.
While they are not at all shy about feeding by day, Fishing Spiders really come into their own at night. A red reptile night bulb will be a great asset if you wish to observe them after dark.
Other Spiders in the Terrarium
Fishing Spider fans will also enjoy the Huntsman or Giant Crab Spider (Heteropoda venatoria), a large, aggressive Asian species that has become established in Florida (of course!) and elsewhere. Jumping, Crevice, Wolf, Crab and Orb-Weaving Spiders, along with countless (literally!) others, also make fascinating terrarium subjects. Please see the articles linked below for information on keeping other spiders, and be sure to post your own thoughts and experiences.
Collecting and Keeping Huntsman Spiders
Beyond Webs: Swimming, Spitting and other Spider Hunting Strategies
Very interesting article indeed! Fascinating to me, is the amount of eggs these lay..WOW
Do you know if the babies would feed on the other babies?
Best regards from Namibia
Nice to hear from you, I hope all is well with you and yours.
The hatchlings stay together in the web for an few days, then disperse…those slow to move off are consumed by more vigorous siblings.
There are related species in Africa. I had an unidentified species at the zoo years ago…bright green, and as voracious as could be. Best, enjoy, frank
What a really interesting read – I’m in to Tarantulas as a little hobby but always fascinated with other types of spiders – thanks for sharing your experiences
Thanks for the kind words, Rob. So many fascinating species, but most are given little attention. You may enjoy this as well http://blogs.thatpetplace.com/thatreptileblog/2010/10/28/beyond-webs-swimming-spitting-and-other-spider-hunting-methods-part-2/#.VR1CIeFkCGE Best regards, Frank
How intriguing – Never really heard of a Gladiator spider, going to have to research them 🙂 You have some really good blog posts, lot of good info, have to keep an eye for more.
Much appreciated, Rob! Let me know if you need articles on any specific topic and I’ll send links; I look forward to your posts and observations, best, Frank
Here I thought I was the only person keeping one of these massive monsters in a tank! This in the only article of it’s kind I have found on the entire web, thus far. I had prepared a habitat for him based on articles I read on basic tarantula care, although I knew that this spider was not a tarantula. So now I am going to make him a better suited home in a 5-10 gallon aquarium, thanks to you. Could you advise me one how to make or modify a lid that won’t let him escape??? I found him inside my house and I do NOT want to find him their again, hahaha! This was the first one I had ever seen and was even bigger than the massive 6 legged battle-worn wolf-spider I found in the woods last year! I’ve wrangled many a large and aggressive creature before… snakes, bulls, boars, centipedes, among others… and this beautiful terrifying creature may have well been the most intimidating. It’s nice to meet someone else keeping one of these fascinating creatures ^_^. Congratulations on your career, if only I could pull that off… My apologies for bothering you, you seem rather important and busy. Thank you so much in advance for your help, and for your help with my toads as well. – Meliane.
Please write in anytime, thanks. Yes, they are something – my nephew, mentioned in the article, ran to my aid once when I was wrapped up in a rope by a very annoyed, very hot rottweiler/mastiff mix owned by my sister (nephew was age 5 1/2 , and has no interest in dogs)’ he’s handled large snakes, 35 lb snappers, has tarantulas – but he wasn’t about to catch that fishing spider!
You can secure the terrarium lid with cage clamps sold for use with snake, or a few pieces of duct tape.
Enjoy, best, frank
I have been keeping a large healthy looking female fishing spider for a couple months in a 10gal aquarium with substrate, crickets, bark, and water. Last Saturday I found a nice looking male. Thinking Daisy (my girl) would like company, I put him in with her. Come Monday there is no trace of the fellow. Not a shred. Escape would not have been possible. Would it be typical behavior for Daisy to gobble the guy up?
Unfortunately most female spiders will eat the male after mating. That’s probably what has happened in this instance.