HHOA 2021 Walleye Watch
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Drag River “Walleye Watch Program” Reinstated
Haliburton, ON April 29, 2021 -- The Haliburton Highlands Outdoor Association (HHOA), has reinstated the Walleye Watch Program, a survey of spawning walleye on the Drag River. The effort is being directed by retired Fleming College Fisheries and Limnology Professor Denis McGee. Fourteen HHOA members and other volunteers carried out the survey over 25 nights until the run was over. The survey focused on two sections of the Drag River below the dam located next to Emmerson Lumber in Haliburton.
“Data from this and future surveys will be used to help us better manage walleye throughout the Kashagawigamog chain of five lakes,” said Denis McGee.
The run lasted from April 2 until April 20, 2021. The total walleye count was 1,334 for all nights combined. This data will be compared to data from the original “Walleye Watch Program” that was started by retired MNRF biologist David Flowers in the early 2000s and ran for 15 years. The Drag River location is considered one of the most important walleye spawning sites in the region.
“We have heard from members and anglers that walleye fishing in the chain has been declining in recent years,” said Dan Smith, HHOA President. “We hope to help improve the fishery through data collection and spawning site improvement.”
Walleye were first introduced into the Kashagawigamog Chain in the 1950s. More recently, walleye were stocked in the Drag River from 2010 to 2015. Walleye stocking was stopped after 2015.
The Haliburton Highlands Outdoor Association helps maintain and enhance local fisheries. Its mission is to help residents and visitors to the Haliburton Highlands enjoy angling opportunities while practicing good conservation. Since 1998, the HHOA has raised and stocked over 700,000 fish in local lakes. For more information on the HHOA and the Walleye Watch Survey visit: https://www.hhoa.on.ca/news
Introduction:
The river has been informally surveyed for the past 5 years but not surveyed every day of the spawning run. This is the first year a formal nighttime survey has been carried out from the start to the end of the run since the “Walleye Watch Program” started and coordinated by Dave Flowers, retired OMNRF Biologist. The “Walleye Watch Program” ran for almost 15 years in the early 2000’s. It is hoped with these standardized protocols and fixed survey areas, that this initial year will form a baseline of data for future years and may be comparable to past data collected in the “Walleye Watch Program”. The objective is to survey every year into the foreseeable future with these standardized protocols so that year to year data and trend over time data is comparable and may provide information to facilitate the management walleye in the Kashagawigamog chain of lakes.
Survey Location:
The survey was performed on 2 sections of the Drag river below the Emmerson Dam in the town of Haliburton. The original survey area was only above the Highway 118 bridge but with rapid decreasing river flows the fish were observed also spawning below the bridge and the “Downstream” survey area was added by the 4th survey night. Luckily volunteers had noted numbers below the bridge on all except the 2nd night.
Drag River Walleye Spawning Survey Study Site (Modified from Fish-Online OMNRF 2021)
Thus, 2 different sites were surveyed every night from the 4th night until the end of the run.
Upstream and Downstream Walleye Survey count sites (Modified from Fish-Online OMNRF 2021)
Survey Procedure:
1. The Drag River “Downstream”, “Upstream” sights were checked nightly starting March 28th, 2021 to determine the start of spawning run. Just a note after a chat with Dave Flowers… they use to check the river mouth also to determine when the fish were staging and getting ready to head upstream. I hope to follow/incorporate this practice next year.
2. Day 1, The run began April 2nd,2021.
3. Day 2, April 3rd, 2021, we had a volunteer meeting/induction at the Drag river and did a count together. We identified the need for a bright light that was able to illuminate walleye eyes on the far (River Right) bank. Although a standardized light intensity would be best, we obviously couldn’t expect volunteers to shell out money to purchase a special spotlight.
4. The survey started at the dam and moved down river sweeping the light beam back and forth slowly ensuring the entire river was covered using a “paint roller coverage” technique.
5. As seen in the satellite image above the “Upstream” survey area ended at a ribbon placed on a bush at the down river end. This location was picked since the riverbank vegetation became too dense to allow for proper fish spotting.
6. The “Downstream” survey area was surveyed from the Highway 118 bridge using the same light sweeping technique to the end of the cobble area just downstream of the bridge.
7. The level of sampling intensity was to run about 15-20 minutes for the count depending on the number of fish to be counted.
8. Fish were tallied by species, with 2 separate counts, “Upstream” and “Downstream” and reported nightly via email.
9. The following were also recorded on a daily basis:
i. Water temperature at 5pm.
ii. Flow (qualitative description, Very high, high, medium, low, very low, very very low). Mac Ellis, retired Trent Severn Waterways (TSW) employee, is making arrangements to get actual flow data from TSW for us.
iii. Head lake ice condition
iv. Survey time and duration
v. Surveyors names
vi. Intermittent day time counts were also recorded the same as the night survey.
vii. Head Lake level in meters. Obtained from the TSW website.
viii. Comments
10. The survey was stopped when no walleye were observed in the river for 2 consecutive nights.
See the table in the results showing all the data collected.
Results:
The walleye spawning run started on April 2nd, 2021 with a water temperature of 5 degrees Celsius , high flow and 90% grey ice cover on Head lake with open water at the Drag river mouth extending out roughly 250m. The walleye run lasted 18 days, ending April 20th, 2021 and can been seen in the Drag River Walleye Spawning Survey graph below.
Walleye Spawning Run Count:
The run seemed to peak day 8 and 9 with a maximum total number of fish in the river being 210, April 10th. This maximum is quite low, compared to the 600-1000 total counts reported by Dave Flowers, per night back in the “Walleye Watch” days. The minimum count was 1 walleye on the last 2 days of the run which seemed to be a lonely, confused male in the pool below the dam. The average number of walleye per night was 74 with the majority being below the dam at the top of the “Upstream” survey area. Note, that this average is calculated with no Downstream count on night 2, April,3rd. The total walleye count was 1334 for all nights combined. In the graph you can see the break down between Up and Downstream counts and the daily water temperature. The numbers for the last few days are hard to read in the graph but can be easily seen in the table.
Drag River Walleye Spawning Survey Graph (Note: the Night Downstream count on Day 2 of zero is actually not a zero observed, but there was no recorded survey of that section that night)
Drag River Walleye Spawning Survey Table (NR = no record)
Water Temperature:
The run started with a water temperature of 5 degrees Celsius, and steadily rose to a maximum of 13 degrees Celsius at the peak of the run. The number of fish in the river rose as the temperature rose to the peak April 10th. Colder weather with near freezing nighttime temperatures resulted in a decrease in water temperature and 10 degrees Celsius at the end of the run. Based on the literature 7-8 degrees Celsius are optimum spawning temperatures for walleye in our area.
Water Flow:
Since the water temperature was below optimum, the main trigger for the start of the run could have been the high water flows in The Drag river for 2 days prior to when the walleye first appeared. Since no real time water flow data was available it was simply recorded qualitatively, at the same time water temperature was taken daily. As already mentioned, Mac Ellis will be providing actual water flows in the near future and this report will be updated. The run started with a high flow, with the 2 large boulders at the based of the dam being covered in white water and started a gradual decline on the second day with medium flows, part of the boulders visible and decreased gradually to low with 75% of the boulders visible at the peak of the run April 10th. The flow decreased everyday until April 16th and then leveled off with very, very low water and no water coming over the logs in the Emmerson dam and the only water flowing was coming from between the dam logs. The 2 large boulders were 95% above water at this time but water depth was maintained by the rising Head lake water level backwatering the river.
On April 16th, with very low water flow there were large masses of white walleye eggs visible in the shallow cobble in the middle of the river just below the dam. After checking with Dave Flowers, it seems this is a normal location and abundance for these eggs. They were still covered with water and just became visible because of the reduced water flow and water depth.
Walleye Egg Accumulation Area Below the Emmerson Dam, (Modified from Fish Online OMNRF 2021)