Oregon Spotted Frog Update: Breeding Baby Frogs Up on the Rooftop

oregon spotted frog green houses Vancouver Aqaurium

Greenhouses on the Vancouver Aquarium’s roof. Photo credit: Neil Fisher

Spring is in the air and for the Oregon spotted frog that means it’s baby frog season! The Vancouver Aquarium, with support from Earth Rangers just like you, is working on breeding and releasing Oregon spotted frogs back into the wild. Breeding Oregon spotted frogs is no easy task; it takes a team of passionate scientists and researchers, who have set up shop on the roof of the Vancouver Aquarium, to oversee the delicate process.

frog tanks

Tanks with Oregon spotted frog eggs. Photo credit: Neil Fisher

In two of the four greenhouses on the Aquarium’s roof, staff are working to ensure that the conditions are just right for Oregon spotted frog reproduction. In most tanks, there are two males to every one female. Aquarium biologist Kris Rossing, says this is because a female frog in the presence of two males, rather than just one male, is more likely to breed.

Currently, aquarium biologists are caring for approximately 60 adult Oregon spotted frogs and 17 egg masses with approximately 11,536 eggs that have produced just under 6000 tadpoles.

Oregon spotted frog eggs

Aquarium biologist Kris Rossing. Photo credit: Neil Fisher

An egg mass looks like a clump of clear jelly with black poppy seeds spread throughout. The “poppy seeds” are actually Oregon spotted frog eggs, and they’re encased in a jelly-like substance that expands when the eggs make contact with the pond water. The eggs take on a different shape as they grow from a circle, to a bean, to a rod shape (that’s when they start looking like tadpoles). The tadpoles hatch within two to three weeks of egg laying.

An important part of this conservation project is knowing just how many eggs are being produced. Kris Rossing explains that there are two ways to get a head count.

counting Oregon spotted frog eggs

Grid tray for egg counting. Photo credit: Neil Fisher

They can do a volume count by putting the eggs in a container and guessing the number of eggs based on the estimation that one egg equals one milliliter or they can count the eggs one by one by putting them in a gridded tray (a grid is drawn onto the tray so the person counting doesn’t lose track). Although the volume method is a lot faster, it is not as accurate as counting on a gridded tray.


One of the biggest challenges to this conservation project is the space and equipment needed to house enough adult Oregon spotted frogs and their egg masses. That’s why we need your support. Your Bring Back the Wild campaigns for the Oregon spotted frog will help provide the tools needed to make saving this incredible species possible!

Start your campaign to protect the Oregon Spotted Frog


Vancouver Aquarium biologist, Kris is proud of the Oregon spotted frog conservation work happening on the Aquarium’s rooftop and says, It really makes me feel good to be saving a species.

A Conservation Project With

Vancouver Aquarium

Earth Rangers is a non-profit organization that works to inspire and educate children about the environment. At EarthRangers.com kids can play games, discover amazing facts, meet animal ambassadors and fundraise to protect biodiversity.

You might also like...


  1. kam1234 says:



  2. dumdum54321 says:

    cool and hi kam


    kam1234 Reply:



  3. dumdum54321 says:



  4. Magg5860 says:

    That was cool


  5. auvod4851 says:

    I want to go their


  6. mia21133 says:

    me too


  7. Maderino says:



  8. 89901pac says:

    Frogs are cool. I used to catch them at the pond. we always released them afterward.


Your Avatar
LOG IN or JOIN to leave a comment