Fishing for salmon is both an art form and a science. Understanding where salmon are likely to rest and how to approach these spots can make a significant difference in your success as an angler. Hopefully, this article provides you with valuable insights into how to locate salmon.

The Importance of Productive Rivers
All rivers are not created equally. When we think of productive salmon rivers, names like the Tay, Spey, or Tweed come to mind. The first step to success is distinguishing between productive and unproductive rivers. Salmon are energy-conscious species, seeking areas that allow them to rest while minimising energy expenditure. Key signs of productive areas include places where fish can find a break from the current.

Anatomy of a Pool
A fishing pool can be divided into three parts: the neck, the middle, and the tail. Each of these sections serves a different purpose for fish and provides different opportunities for anglers.
The Neck
Where to cast: Begin at the neck of the pool where water flows in from a run.
Fish behaviour: Salmon may rest near the edges of fast moving water, seeking breaks in the current.
The Middle
Strategic casting: Experiment with different casting angles, casting square or with a slight angle to cover the area thoroughly.
The Tail
Prime location: The tail of the pool is where water flows out, providing oxygenated flow. Salmon can often be found lying here recovering.
Pro tip: Present your fly/lure so it tightens up naturally in the current, enticing fish as it moves through.
Key Structures Where Fish Hold
- Hydro Cushions: These are the areas directly in front of large rocks or boulders. The force of the water hitting these rocks creates a cushion of slower water, where fish can rest without exerting too much energy. It’s also an ideal ambush point for hungry fish.
- Seams and Eddies: The edges where fast-moving water meets slower currents (called seams) are prime locations. Fish use these boundaries to wait for conditions to change in their favour.
- Pools and Tail-outs: The ends of pools or runs are where salmon often rest after navigating fast water. These areas serve as natural rest stops for fish, making them ideal spots to cast.
- Snags/Sunken Trees: Just like the aforementioned structures, snags or sunken trees offer protection from predators and serve as ambush points for prey.
- Wiers/Waterfalls: Targeting the bottom of these features can prove very productive, especially after a river has been in spate or there has been a change in water temperature.
Pro Tip: Fish to the side, top, and back of these structures. As fish can hold anywhere around these structures.

The Role of Energy Efficiency
Salmon aim to conserve energy for their long travels upriver. This is why they hold in places like the edges of rocks or behind large structures where the current is weaker. For us as anglers, it's important to focus our efforts on these areas rather than wasting time in stretches of water where fish are unlikely to be or are in very few numbers.

Effective Casting Techniques
It is essential to ensure your casting is accurate and efficient. You need the fly or lure to land effectively in a targeted area so it is visible to the fish and looks somewhat natural when it starts to fish. Salmon, when they come into our river systems, are not actively feeding; their mind is elsewhere. Multiple casts (up to ten) to the same spot may be required to agitate a fish enough to strike. This method highlights the importance of persistence and understanding fish behaviour
- Approach with Stealth: On smaller rivers, fish can be easily spooked. Approaching quietly and carefully is essential to avoid alerting the fish to your presence.
- Precision Casting: Cast to the seams, behind rocks, or in front of boulders. It may take several tries, but self-confidence and persistence will pay off.
- Presentation Matters: How your fly/lure is presented can determine your success. Watch how your fly line and fly/lure lands and fishes. Subtle variations in presentation can make the difference.

Understanding High Water Conditions
High water situations, often caused by heavy rain, can make for challenging fishing conditions. However, they can also simplify the search for salmon in some ways. As rivers swell, salmon will start to run in numbers, but it also pushes resting salmon into fewer, more predictable holding areas. Understanding these dynamics is crucial.
- Seek Out Sheltered Structure: Salmon may move to the riverbanks or areas with reduced current speed. These spots are often near submerged logs, rocks, or other debris, as highlighted earlier in the article.
Pro tip: When fishing high water conditions, use shorter casts and focus on the edges.

Temperature is key
Like all fish species, water temperature plays a pivotal role to migration and spawning activity. So having a good understanding of water temperature will also aid in your overall success. Salmon will hold at the confluence (where two rivers meet) or at the bottom of a waterfall/weir until water flow and temperatures are optimal before they continue their journey upstream.
Pro tip: Warmer water requires targeting areas with increased oxygen levels, such as fast-flowing sections or shaded zones. Work these areas first.
Targeting these areas at the right time of year can prove productive.
For UK Atlantic salmon, the optimal water temperature range for their spawning migration is as follows:
Optimal Temperature Range
Migration: 7°C to 12°C
This range is ideal for upstream movement, as it provides a good balance between energy efficiency and sufficient oxygen levels in the water.
Spawning: 4°C to 10°C
Salmon prefer slightly cooler temps for spawning, this ensures the eggs are deposited in a stable, oxygen-rich environment.
Behavioural Responses to Temperature
Below 4°C: Salmon may become sluggish and delay migration. Movement is energy-intensive, and they conserve energy by staying in deeper or slower-moving water.
Above 15°C: Salmon experience thermal stress. Oxygen levels in warmer water decrease, leading to fatigue and potential delays in migration. Prolonged exposure to temperatures above 20°C (68°F) can be lethal for Atlantic salmon.
Why Temperature Matters for UK Rivers
Regional Variations: Keep in mind that UK rivers vary significantly in their thermal profiles due to geography, flow patterns, and seasonal weather. Northern rivers like the Tay, Spey or Dee tend to stay within optimal ranges for longer compared to southern rivers like the Severn or Wye. So bear thin in mind when planning your fishing campaign.
Seasonal Timing: Most UK Atlantic salmon runs occur in cooler seasons (autumn and early winter) to align with optimal water temperatures and flow levels.
Key Takeaways
- Patience and Repetition: Don’t give up after one or two casts. Repeating the same cast several times can yield results.
- Understand Fish Behaviour: Knowing why fish hold in certain places helps you make better-informed decisions on where to fish.
- Focus on Natural Holding Waters: Areas behind rocks, in front of boulders, and along seams are your best bets.
Understanding where and why salmon hold in rivers equips you with the knowledge to fish more effectively. By applying these insights, you can better predict fish behavior and improve your chances of a successful day on the water.