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Dark Fishing (Dolomedes tenebrosus)

The Dark Fishing Spider is a special spider from the Pisauridae family. It looks a lot like the striped fishing spider. Here’s something wild: after these spiders mate, the male often becomes a meal for the female! In this blog, we’ll share more amazing facts about this unique spider.

Scientific Classification

Dark Fishing Spider

Physical Description and Identification

Adults

  • Size: Females are 0.59 -1.0 in (1.4 – 2.4 cm) and males are 0.27 – 0.51 in (0.68 – 1.2 cm). The legs are 1.9 – 3.5 in (4.8 – 8.8 cm) long.
  • Color: Dark or pale brown body with chevron markings. Reddish or brownish-black bands on legs.
  • Other Characteristic Features: Two rows of eyes and the larger ones are at the top.
Dark Fishing Spider Size

Eggs

Around June, the female spider lays around 1,000-1,400 eggs in a sac that is attached to her body. A few days before hatching, the female joins the egg sac or case to a surface and builds a nursery web around it.

Dark Fishing Spider Egg Sac

Spiderlings

After hatching around July, the young ones become dependent on their mothers and stay in a nursery web for a little time.

Dark Fishing Spiderlings

Dark Fishing Spider Web

Dark Fishing Spiders do not construct webs for prey capture. Instead, their webs serve as protective nurseries for their young. These nursery webs are usually woven close to surfaces, offering additional support and safety for the spiderlings.

Are Dark Fishing Spiders Venomous?

Yes, Dark Fishing Spiders have venom. They use it to catch their meals. For people, this venom is generally not harmful.

Can Dark Fishing Spiders Bite?

Yes, Dark Fishing Spiders can bite. They don’t usually bother humans, but if they’re scared or surprised, they might give a small bite.

Dark Fishing

Ecological Importance and Behavior of Dark Fishing Spider

The Dark Fishing Spider plays a vital role in controlling insect populations, contributing to the balance of aquatic and terrestrial ecosystems. Their hunting skills extend to both land and water, showcasing their adaptability and importance in nature.

Natural Predators: Birds and larger arachnids pose threats to the Dark Fishing Spider, creating a natural check and balance within the ecosystem.

Prey-Predator Dynamics: The Dark Fishing Spider’s role as both predator and prey underscores the complexity of food webs, highlighting the spider’s significance in maintaining ecological stability.

Relationship with Humans: Despite their occasional ventures indoors, Dark Fishing Spiders are not a threat to humans. Their presence can be beneficial, as they help control insect populations. Educating the public about these spiders fosters coexistence and appreciation for their role in nature.

Quick Facts

DistributionUSA and Canada
HabitatTrees, wooded surfaces, and inside the house
DietAquatic insects and small fish
IUCN Conservation StatusNot listed
Dark Fishing Spider Web
Dark Fishing Spider Image

Did You Know

  • Consuming the male after mating is believed to provide nutritional benefits for the female and her developing eggs.

In summary, the Dark Fishing Spider is a captivating species, with its unique behaviors, physical characteristics, and ecological importance making it a noteworthy subject of study and admiration. 

The Dark Fishing Spider is a special spider from the Pisauridae family. It looks a lot like the striped fishing spider. Here’s something wild: after these spiders mate, the male often becomes a meal for the female! In this blog, we’ll share more amazing facts about this unique spider.

Dark Fishing Spider

Physical Description and Identification

Adults

  • Size: Females are 0.59 -1.0 in (1.4 – 2.4 cm) and males are 0.27 – 0.51 in (0.68 – 1.2 cm). The legs are 1.9 – 3.5 in (4.8 – 8.8 cm) long.
  • Color: Dark or pale brown body with chevron markings. Reddish or brownish-black bands on legs.
  • Other Characteristic Features: Two rows of eyes and the larger ones are at the top.
Dark Fishing Spider Size

Eggs

Around June, the female spider lays around 1,000-1,400 eggs in a sac that is attached to her body. A few days before hatching, the female joins the egg sac or case to a surface and builds a nursery web around it.

Dark Fishing Spider Egg Sac

Spiderlings

After hatching around July, the young ones become dependent on their mothers and stay in a nursery web for a little time.

Dark Fishing Spiderlings

Dark Fishing Spider Web

Dark Fishing Spiders do not construct webs for prey capture. Instead, their webs serve as protective nurseries for their young. These nursery webs are usually woven close to surfaces, offering additional support and safety for the spiderlings.

Are Dark Fishing Spiders Venomous?

Yes, Dark Fishing Spiders have venom. They use it to catch their meals. For people, this venom is generally not harmful.

Can Dark Fishing Spiders Bite?

Yes, Dark Fishing Spiders can bite. They don’t usually bother humans, but if they’re scared or surprised, they might give a small bite.

Dark Fishing

Ecological Importance and Behavior of Dark Fishing Spider

The Dark Fishing Spider plays a vital role in controlling insect populations, contributing to the balance of aquatic and terrestrial ecosystems. Their hunting skills extend to both land and water, showcasing their adaptability and importance in nature.

Natural Predators: Birds and larger arachnids pose threats to the Dark Fishing Spider, creating a natural check and balance within the ecosystem.

Prey-Predator Dynamics: The Dark Fishing Spider’s role as both predator and prey underscores the complexity of food webs, highlighting the spider’s significance in maintaining ecological stability.

Relationship with Humans: Despite their occasional ventures indoors, Dark Fishing Spiders are not a threat to humans. Their presence can be beneficial, as they help control insect populations. Educating the public about these spiders fosters coexistence and appreciation for their role in nature.

Quick Facts

DistributionUSA and Canada
HabitatTrees, wooded surfaces, and inside the house
DietAquatic insects and small fish
IUCN Conservation StatusNot listed
Dark Fishing Spider Web
Dark Fishing Spider Image

Did You Know

  • Consuming the male after mating is believed to provide nutritional benefits for the female and her developing eggs.

In summary, the Dark Fishing Spider is a captivating species, with its unique behaviors, physical characteristics, and ecological importance making it a noteworthy subject of study and admiration.