Hide and go zoo?!

Aquatic Invasive Species (AIS) can run, but they most certainly can’t hide – especially with all the help we receive from our partners and concerned citizens who are always reporting suspicious species! This spring, one AIS was found and luckily, quickly lost this round of hide-and-go-seek.

You may be wondering, zoo is the culprit here? Yellow floating heart, that’s who! On
May 23rd, 2019, the Integrated Pest Management team from the City of Edmonton contacted the AIS team to report a weed issue in a moat adjacent to the lemur enclosure at the Edmonton Valley Zoo. The AIS Specialist confirmed on May 27th that the plant was the Yellow Floating Heart 2prohibited species, Nymphoides peltata or yellow floating heart. This perennial species is native to Asia and Europe, and is a serious ecological threat to fish and their habitat by creating dense mats on the water’s surface, which crowd out native plants and reduce oxygen levels.

 

Y Floatign Heart 2019 Edm Zoo_0050

Yellow Floating Heart roots in the soil and sends up leaves to float on the water surface. Flowers are bright yellow and have 5 petals. (Photo credit: Nicole Kimmel)

Fortunately, the moat system in the zoo is isolated and yellow floating heart has only been found in this one location. Unfortunately, the moat has been drained into a nearby storm drain that is connected to the North Saskatchewan River. This was concerning as yellow floating heart spreads in many ways: seed, rhizomes (below ground runners), stolons (above ground runners) and basically, through any fragments of the plant. The river is now under surveillance. Since this species is particularly challenging to eradicate, this weed issue quickly turned into an emergency response. On June 12th, the AIS team joined Edmonton Valley Zoo staff in hand removal of this plant. Water was hydro-vacuumed out of the moat and disposed of at hazardous injection well sites to ensure any possible fragments were not spread.

 

Yellow floating heart - Photo Credit Tanya Rushcall

AIS and Edmonton Valley Zoo staff hand removing all plants and fragments of yellow floating heart from the moat (Photo credits – Tanya Rushcall & Nicole Kimmel).

AIS and Edmonton Valley Zoo staff have been monitoring the site and will continue to dYellow Floating Hearto so for two additional years to guarantee yellow floating heart is no longer hiding in the shallows of the lemur moat! Although, an ASERT response was initiated, it’s thanks to reports like these that help us catch those AIS that hide and fuel us to seek immediate reactions. No more, “you’re it” but instead “you’re zoo out of here!”

 

How can you help?

  1. Don’t let it loose! Never release unwanted aquarium species – it’s illegal, unfair to native species and harmful to the environment.
  2. Report what you see! Call the AIS hotline at 1-855-336-BOAT (2628) or use the EDDMapS Alberta.
  3. Learn to identify Alberta’s 52 prohibited aquatic invasive species using our pocket guide.
  4. Fill out Fisheries and Oceans Canada survey on water gardens to help them gain a better understanding of the use and movement of aquatic plants.

Fish you were (NOT) here

There’s something fishy going on… and thankfully a few concerned citizens “caught” it!

On July 10th 2019, the Aquatic Invasive Species (AIS) Hotline received a report of numerous dead fish in the Elbow River, just outside of Bragg Creek. Fish biologists confirmed on July 11th that the fish were tilapia. This warm-water species is native to Africa and the Middle East, and pose immense risks to native fish species by creating turbid waters and outcompeting them for food and space.

Tilapia 2 - Credit Travis Shield1

Photo credit: Travis Shield

Unfortunately for the tilapia, their warm-water loving trait likely lead to their demise – depending on the species, they can die from temperatures ranging from 7 to 17°C. Although, the Elbow River was 11.7°C on July 11th, the thermal shock from their tank environment to the Elbow River was enough to o-fish-ally end this scare. Tilapia’s intolerance for low water temperatures makes their establishment in the Elbow River highly unlikely, as temperatures between 0°C to 4°C are common in winter months. Even though the tilapia did not survive, any parasites or diseases that they may or may not have been carrying have the potential to affect native and stocked fish populations.

So how did these fish get into the Elbow River? Even if they end up on your dinner plate, they certainly do not belong in our rivers and streams! Tilapia have been introduced around the world as a food source, as they are easy to grow and are mild-flavored. There are several licensed aquaculture facilities in the Calgary area, where the fish could have been deliberately dumped from. Facilities have been contacted regarding this fish introduction, as the release of fish into Alberta waters is illegal and prohibited under the Fisheries (Alberta) Act.

Tilapia - Credit Paul Christensen1

Photo credit: Paul Christensen

Environment and Parks staff will continue to scale the Elbow and Bow Rivers to ensure the tilapia aren’t lured into any warm spots, where wastewater treatment plants discharge their water. You too can help us by keeping your eyes peeled while you’re fishing, floating or hiking in the area!

How can you help?

  1. Don’t let it loose! Never release unwanted aquarium species – it’s illegal, unfair to the fish and harmful to the environment.
  2. Report what you see! Call the AIS hotline at 1-855-336-BOAT (2628) or use the EDDMaps Alberta app.
  3. Learn to identify Alberta’s 52 prohibited aquatic invasive species using our pocket guide.

4. Fill out Fisheries and Oceans Canada survey on live seafood to help them gain a better understanding of the use and movement of commercially available live seafood.

The “crab-divating” story of illegal species transport

Alberta is always on the lookout for aquatic invasive species (AIS), specifically the 52 species listed as prohibited on the Fisheries (Alberta) Act. Sometimes, however, we get very interesting species that have the potential to get us in hot water, if they went undetected! Over the years, we have flushed out as many invasive species as we can and this month we will be elaborating on a few Aquatic Anomalies that have tried their luck at entering Alberta waters.

What wears mittens, enjoys long walks on the beach and has eight legs? The answer is… Chinese Mitten Crabs! At less than 10 cm in size, they may not seem like a big deal but these little crustaceans pack a big pinch by wreaking havoc both on the environment and human health. Importing these crabs into Canada alive is illegal without a license but recently, people have been testing the waters.

Chinese Mitten Crab 5

Photo credit: Canadian Food Inspection Agency

On October 24th, 2018 the Canadian Border Services Association (CBSA) seized a shipment destined for a Calgary residence that was declared as “TV Lights”. This ill-marked Styrofoam box contained 21 kg of very real, very live Chinese Mitten Crabs. These greenish-brown crawlers are best known for their two claws with white tips and thick furry hair that resemble mittens. This species is native to East Asia and is considered a delicacy in Asian cuisine.

The shipment seized at the Calgary International Airport came from Hong Kong. Additionally, the importer did not have a fish import license, which is mandatory for anyone that wishes to import live fish or fish products. When CBSA finds an illegal species, they often connect with other government agencies more specialized in dealing with the species in question. In this situation, CBSA contacted both the Aquatic Invasive Species (AIS) program staff and the Canadian Food Inspection Agency (CFIA). The package was detained and the case was handed over to the CFIA, where the crabs were euthanized.

Luckily, this invasive species was detected and stopped, as Chinese Mitten Crabs can threaten aquatic ecosystems by eating fish eggs and damaging fish habitat through their burrowing activities. In Alberta, the extent of environmental threats was deemed low because the crabs were unlikely to survive, if released. However, this still left a human health concern. Chinese Mitten Crabs act as an intermediate host for the oriental lung fluke, a parasite that can be passed to humans who consume it raw.

Chinese Mitten Crab 11

Photo credit: Canadian Food Inspection Agency

The CBSA doesn’t just help in the fight against invasive species at the airport, they also collaborate with AIS program staff at land borders. In 2017, the province worked with CBSA to develop a border notification system to keep AIS staff informed when a boat passed the border outside of watercraft inspection station operating hours. Over 900 boats have been reported to date that could have otherwise been missed without this partnership. Collaboration is crucial to protect Alberta’s environment and ecosystems and we hope that you can continue to help us claw through the threat of aquatic invasive species by: