I knew little or no about steelhead angling when I first hiked into Portage Creek at age 18 along-aspect household good friend and then-Ministry of Pure Sources (MNR) worker Jon George, who was engaged on a key analysis undertaking. Quick ahead 20 some years, and I’m nonetheless making the hike.
This essential tributary flows into Lake Superior’s Black Bay some 40 kilometres east of Thunder Bay. In 1994, when the world’s steelhead fishery was displaying indicators of overharvest, a landowner posted a one-kilometre stretch of land beneath a small waterfall on Portage as personal property, stopping angling. This created a chance for the ministry to conduct a analysis research with the first focus of monitoring the steelhead population publish exploitation.
The North Shore Steelhead Affiliation (NSSA) and the ministry labored collectively on this long-term undertaking which created an “index stream” for steelhead monitoring on Portage and different Black Bay tributaries.
Portage Creek fish inform a story
To conduct this research, volunteer anglers and ministry workers caught steelhead utilizing conventional angling strategies. Fish had been sampled, intercourse and size documented, scale samples taken, and colour-coded tags had been sewn onto the dorsal fins. Fin clips distinctive to the 12 months had been additionally utilized.
What the analysis reveals is that the steelhead inhabitants has shifted dramatically over time. The 1992 inhabitants was 500, spiking to a excessive of two,000 in 2004. Then, issues began to say no sharply, and in 2013 the inhabitants estimate dropped to 400. With nothing altering so far as angling harvest goes, this was an fascinating and regarding shift. Anglers in all Black Bay tributaries, rivers that had been historically wonderful steelhead fisheries, began to see a pointy decline in fish numbers.
Anglers knew populations had dropped, and the fishery was altering, however the knowledge from Portage confirmed the pattern.
By 2018, there have been fewer than 150 grownup steelhead remaining within the spring spawning inhabitants. Since then, the inhabitants has remained low. There may be little or no recruitment, and the inhabitants is weighted in the direction of older fish. Steelhead spend one to 2 years within the stream earlier than migrating (smolting) out into Black Bay. After a 12 months or two, fish mature and return to spawn in Portage for the primary time. The research confirmed poor survival of immature steelhead in Black Bay over the previous 15 years. This decline wasn’t skilled in close by Nipigon Bay and Thunder Bay, and was seemingly remoted to Black Bay.
The rise of perch and walleye
Across the time of the steelhead decline, perch and walleye populations rose. Walleye and perch in Black Bay had suffered considerably over the years, primarily attributable to business harvest, however have made a major comeback because the mid 2000s.
The information confirmed that steelhead that spent two years within the stream earlier than shifting into Superior (versus fish that solely stayed for one 12 months) stood a greater likelihood of surviving. These fish are larger. Black Bay produced monumental perch, and recurrently coughs up large walleye. Navigating these predator-filled waters is difficult for steelhead smolts, and is the possible purpose many one-stream-year fish aren’t surviving.
Portage hosts a wholesome inhabitants of brook trout, and lately we appear to catch extra. The most important brook trout that was tagged was later caught a exceptional distance away, in a tributary north of Sault Ste Marie.
Portage Creek holds a particular place in my coronary heart, and even with restricted fish numbers, it is a journey I attempt to do every year. It’s an journey, with the added bonus of spending the day on the water with a long-time good friend, absorbing a few of his metalhead information.
Participating on this research was drastically different previous to the decline; a day within the early 2000s could have yielded 50 fish (a enjoyable however tiring day). In current years, we had been comfortable to catch two or three a day. If we acquired 5, it was almost trigger for celebration.
Initially printed within the Spring 2024 challenge of Ontario OUT of DOORS
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