coho fry

Over 12,000 Coho Fry Clipped at Hoy Creek Hatchery

Thank you to all of our volunteers who came out on June 21 to take part in our annual coho fry fin clipping exercise. We clipped 12,400 coho fry! The salmon are approximately 3 months old.

The exercise was supported by Fisheries and Oceans Canada and held in front of Hoy Creek Hatchery in Coquitlam .

The adipose fin is removed and is a soft, fleshy fin found on the top of the salmon, on the back behind the dorsal fin and just forward of the caudal fin. This marking of our coho supports:

Stock assessment for when salmon return to spawn, the clipped fins allow hatcheries and stream keepers to monitor their return. Selective fisheries - in certain regions and sub-areas, a marked fishery is permitted for the retention of the coho. The procedure also allows for a manual fish count, whereas previously only weight sample counts took place.

First, the fish are anesthetized in small batches. Once in the solution, they become sleepy within minutes. The volunteers stand ready around a table equipped with a trough with flowing water and beds of water for the fish to lay in. Volunteers work quickly and very carefully to clip fins with disinfected surgical scissors before they wake up, which is within about a minute. Fish are put into the outside trough and end up in the bucket at the end of the table. They are returned to the hatchery to recover.

A portion of the fish will be ponded at various creek locations in Coquitlam and the remaining will soon be transferred from the hatchery Capilano trough room to the outdoor rearing pond until Salmon Leave Home in May 2025. Fish from this brood could then return in about 1.5–2.5 years.

Rearing Pond Invertebrate Salvage

Crayfish catch! All found in the bottom of the rearing pond. (Photo: HSWS)

Hoy/Scott Watershed Society conducted the annual rearing pond salvage on May 24.

Coho smolts were released on May 14. The water drained from the pond leaves lots of discoveries for invertebrates and crustaceans like crayfish, stoneflies and lamprey for discovery. One salmon smolt, as well as about a dozen fry, were also found. All were released into the stream.

Floorboards over the pond were first removed. After the salvage, the City of Coquitlam arranges for the pond mud and sediment to be removed via McCrae's Environmental Services (a vacuum truck), and then the pond will be pressure washed by the Society, floorboards returned, and then the creek water is reintroduced.

Later this month, the rearing pond will then be ready for the next coho brood to be transferred from the hatchery to live there until May 2023.

(Photo: HSWS)

Tyler searching with flashlight. (Photo: HSWS)

(Photo: HSWS)

Hatchery Update – The Coho Fry Stage

Coho fry approximately 5 month old.

Since our last update, a lot has changed, not only with our eggs hatching, alevin emerging and now maturing to swim-up fry but the global pandemic we face.  As a result of COVID-19, Hoy-Scott Watershed Society has made the decision to cancel all Saturday work sessions, all in-person meetings, and hatchery tours or open houses until further notice including our annual Salmon Leave Home event.  

Behind the scenes, our volunteers continue to provide the daily aquaculture care including feeding, filter and equipment/tank cleaning supporting the 2018/2019 broodstock held in our rearing pond and the 2019/2020 swim-up fry that have been transferred from the incubator to our Capilano trough.

Three of our four Coho Salmon trays in the incubator have matured to fry with only a faint reminder on their bellies where a yolk sack once was (from the Alevin lifecycle stage).  These three trays have been transferred to our Capilano trough and all at different times as they each reach their maturity as swim-up fry. As of today, we have almost 8000 fry held in our Capilano trough (on the east side of the hatchery building), and the final incubator tray is just days away from joining the rest as they mature. Our survival rate has been over 99% with this year's collection and we will have almost 14,000 coho salmon.

Fry are ponded and move from the incubation room to the Capilano trough on the east side of the hatchery.

Fry are ponded and move from the incubation room to the Capilano trough on the east side of the hatchery.

When first ponded, the fry undergo a vital change – it takes some time (between 20-40 mins or more), but they eventually swim-up to the surface to take in air.  Over a period, they will take several surface gulps of air that fill up their swim bladder allowing them to hold a position in the water (i.e. float). As the fry begin to stabilize and adjust to this new environment, we begin to feed them with food for their first time; previously as alevin, they fed off their yolk sacks. 

Our fry along with wild salmon have developed dark bars on their sides by now, called parr marks.  In a natural environment, these bars help them to camouflage with the gravel and blend in with their surroundings to hide from predators like birds.  Coho fry within Hoy creek and other estuaries will be visible if you are to patiently wait and watch long enough in eddies and still pools.

As the weather improves, we find ourselves getting out to complete yard work, clean the exterior of the house, clean the car, among many other activities.  With each of these activities, we should stop and think about where the fertilizer run-off goes, the same about the paint that fell off the fence or house during washing, the soap that removed the grime from the car and even the sand with some murky water that left the driveway bright grey once again.  All of these are pollutants and we must each do our part to ensure these don’t end up in our watershed or elsewhere in the environment. 

Also when taking a walk through the watershed on sunny days, remember how nice it is to be in the cool shade.  Wild salmon in the creek including our hatchery fish rely on shade created from large boulders, overhanging bushes, tree stumps or fallen logs to keep the water cool.  Wooded debris in the creek not only provides shade but food sources and also acts as a natural aerator to keep up the oxygen in the water for the fish to survive. Please remember to leave the branches, logs and creek banks the way they are found to ensure the creek remains stable, healthy and productive with life.

If you have questions or are interested in volunteering with the society, please contact us at hoyscottwatershed@gmail.com. Be sure to check out our Facebook page for more photos of our work and of nature along the watershed.

Coho Fry Numbers hsws 2020.jpg

HSWS featured in Tri-City News 'Saving our Salmon' (SOS) series

Thank you for your support, Tri-City News!

The Hoy-Scott Watershed Society was quoted in the The Tri-City News on November 16th, 2016, along with other stewardship groups, on how we can all do our part in protecting wild salmon.

"Get to know your watershed. Salmon and their habitat can’t protect themselves - we need to care and advocate for both. Visit a stream, talk to your local stewardship group, and view the fish and habitat. Understand the issues. Monitor and report suspicious activity." - HSWS

Part 1

We were also featured on November 19th through a site visit by reporter Sarah Payne. Both HSWS president, Robbin Whachell, and vice president and hatchery manager, Rodney Lee were interviewed for the article.