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    Highline MaST Aquarium

    4.8 (25 reviews)
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    Nice little aquarium
    Alisha B.

    Explore this small aquarium featuring 250 different marine species native to the Puget Sound in 15 tanks that continuously circulate the seawater from below the pier! Enjoy a couple of large open touch tanks, situated low enough for kids to see and interact with "everyone". Get to know the locals! Touching is encouraged and if you're really lucky, you can watch the Highline College staff feeding the critters. ​Watching a sea star slowly transport a bit of fish along hundreds of tiny tube feet towards its middle is mesmerizing. The whale skeleton in the entrance puts things into perspective! We love it---kids, grandparents, parents.... and enjoy eating lunch on the beach or at the park after. The adjacent boardwalk is also a family fav! HOURS- Saturday 10-2

    Sarah E.

    Yes, it's a free aquarium, but I was really disappointed. There is a small walk through area with a whale skeleton and then you head outside to the small shack that hold the "aquarium." It's really a few fish tanks that look very unkept with a few native Sound species. They are only open a short window on Saturdays and I'm sad this volunteer run program wasn't very clean or informative.

    Clari N.

    For a completely free aquarium... it's absolutely Amazing! Volunteer educators who love the ocean and want to provide the best experience for you! It's amazing!

    Crystal H.

    This a free aquarium right along Redondo beach! It's a small aquarium, so don't expect it to be like the Seattle Aquarium. In the front there is a large skeleton for a whale and preserved sea life in bottles. Walking on the boardwalk in the back, there are several takes of sea life, fishes, jelly fishes, sea slugs, octopus, and many more! The tanks look like they should get a clean, but still very interesting to see! There was a live TV of divers and a camera of the underwater! There's a touch tank for kids and adults! The volunteers are awesome and super nice!

    Whale!
    Amy M.

    Amazing! Interactive aquarium/petting zoo/museum. I had so much fun here, and I'm an adult. The sea life was great. Huge, huge collection of marine species locally found in the sound. Something so magical about being on the dock over the sea life interacting with it above. There are two buildings on the dock. One was the aquarium and the first was the Main museum with displays and exhibits. Both are fairly small, but packed with tons of entertainment. We spent about an hour here, easily. The sea animals are well kept by the friendly and knowledgable volunteers. I was welcomed to touch and feel live sea stars and anemones. So weird! We enjoyed the jelly fish display. They were luminescent and lit up by black lights. Their new "baby" octopus was so cute! She was huge and is only going to get larger. It's free and open on Saturdays from 10am-2pm. Donations are welcome :)

    Vanessa M.

    Very cool place & free until 2pm on Saturday's!Took my kids & they loved it. There are two touch tanks & a handful of tanks with lots of stuff to look at. They had an octopus in one that kept going back & forth in her tank it was awesome. Only reason for the 4 stars is because of how small it is.

    Jillian M.

    Really cute place. During the week, the MaST is the marine bio classroom of Highline College. On Saturdays, it's a public aquarium, filled with thousands of Puget Sound animals and even a huge whale skeleton! Great place for kids, and it's FREE! Definitely worth the trip down to (gorgeous) Redondo Beach. Grab a snack or drink at Salty's on your way out. And don't miss the MaST's free events, like public science lectures, volunteer opportunities, virtual scuba dives, holiday festivals, and more!

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    1 year ago

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    2 years ago

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    7 years ago

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    8 years ago

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    4 years ago

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    7 years ago

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    3 years ago

    Very cool free aquarium. Like the views, tide pools, and the few displays they have. Recommend for a quick visit.

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    13 years ago

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    8 years ago

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    13 years ago

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    11 years ago

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    8 years ago

    Really cute little Aquarium. Definitely worth the stop. Loved the fact all the volunteers were kids.

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    12 years ago

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    10 years ago

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    8 years ago

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    13 years ago

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    13 years ago

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    12 years ago

    Such a convivial aquarium. This is place is worth a buoyant gamble through it. Enjoy!

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    10 years ago

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    11 years ago

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    Ask the Community - Highline MaST Aquarium

    Review Highlights - Highline MaST Aquarium

    I discovered this FREE aquarium after a lunch at Salty's.

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    Aquarium Co-Op - Fancy goldfish

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    4.5(225 reviews)
    29.7 mi

    I had an absolutely fantastic experience at the Aquarium Co-Op store in Edmonds on my first visit!…read moreAs a brand-new fish mom, I came in with a lot of questions, and Jeff went above and beyond to help me. He was incredibly patient, took the time to explain everything in a way that was easy to understand, and gave thoughtful recommendations that were perfect for a newbie like me. What really stood out was that he didn't just tell me what to do -- he actually demonstrated how to properly clean the bottom of the tank, which gave me so much more confidence going home. I never felt rushed or talked down to, just genuinely supported. The selection of fish, live plants and accessories are incredible! The fish look happy and active, and I now have a few favorites to come back for once I get a bigger tank. If you're new to fishkeeping or even if you're experienced and want great advice, this is the place to go. Huge thanks to Jeff and the Aquarium Co-Op team for such outstanding service. I'll definitely be back!

    My fish all died of Ick. It is a contagious illness, I got all my fish from you…read more I will not be buying my replacement fish from you. I am sad about this as your place is huge and inviting, and your pumps are great, I can't risk another die off like this. I didn't come in and tell you in person as I dislike confrontation. Please be more careful in the future. I had tetras minnows and two plecos in a 38 gallon tank.

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    Very knowledgeable. They helped us every step of the way get our first Betta tank set up. Even when…read morewe were a bit worried we weren't doing it right, they said wait a few more days. And bam...our tank was ready. Right on the day. We named our betta "Darwin". He is very social and friendly. Lots of personality within the first day. We couldn't be happier and so glad this store is so close by.

    We recently had Jamie from Aquarium Pro set up our 60-gallon rimless reef tank, and the experience…read morewas absolutely seamless! From concept, guiding us on choosing the right equipment to completing a full cycling installation, Jamie made the entire process stress-free and enjoyable. Her knowledge, patience, and attention to detail ensured that our first reef tank was set up for long-term success. The tank is now home to an incredible mix of marine life, including: Cleanup Crew - Green emerald crab, hermits, and snails Corals - Zoanthids, gold hammer coral, toadstool leather, and octospawn Fish - A pair of clownfish, a starry blenny, and a yellow wrasse Everything is thriving, and we couldn't be more excited to watch our little ecosystem grow! Jamie provided excellent communication, answering all of our questions and giving us guidance on best practices for maintenance and gradual additions. If you're looking for expert advice and top-tier service in reef tank setups, saltwater aquariums, or marine livestock, Aquarium Pro is the place to go! Thanks again to Jamie and the team for all the hard work--we'll definitely be back for more as our tank evolves!

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    Aquarium Pro - Newly installed 60 gallon rimless tank. 01/26/2025

    Newly installed 60 gallon rimless tank. 01/26/2025

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    Highline MaST Aquarium - aquariums - Updated May 2026

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