Understanding Tides: How to Read Tide Charts
Have you ever fished the exact same rock mark on two different days using the exact same bait, but caught a dozen fish one day and absolutely nothing the next? Assuming the weather was the same, the culprit was almost certainly the tide.
Understanding how water movement dictates fish feeding behavior is the single most important skill a sea angler can develop. The Irish Coast experiences massive tidal fluctuations due to the Atlantic Ocean funneling into the Irish Sea. Let's break down exactly what this means for your fishing.
1. The Rule of Twelfths
Tides do not rise and fall at a constant speed. Instead, they follow a bell curve known as the "Rule of Twelfths."
If the time between low tide and high tide is approximately six hours, the water depth increases in twelfths:
- Hour 1: Rises by 1/12th of the total range. (Slow)
- Hour 2: Rises by 2/12ths. (Speeding up)
- Hour 3: Rises by 3/12ths. (Maximum flow - Best Fishing!)
- Hour 4: Rises by 3/12ths. (Maximum flow - Best Fishing!)
- Hour 5: Rises by 2/12ths. (Slowing down)
- Hour 6: Rises by 1/12th. (Slow, approaching High Water)
Therefore, the middle two hours of the tide—often called "the flow" or "the push"—is when the water is moving the fastest. Fast water creates strong currents that pull baitfish, crabs, and worms out of their hiding spots, sparking feeding frenzies among predators like Bass and Mackerel.
2. Neap Tides vs. Spring Tides
Not all tides are equal. The height of the tide is governed by the gravitational pull of the moon and the sun.
Spring Tides
These occur roughly every two weeks during full moons and new moons, when the sun and moon align. Gravity pulls harder on the ocean, causing the highest high tides and the lowest low tides. The massive volume of water moving creates raging currents in coastal channels. This is generally the best time for shore angling, especially for larger predators.
Neap Tides
These occur during the quarter moons when the sun and moon are at right angles to each other, resulting in smaller tidal ranges. The water doesn't move as fast, which can lead to poor fishing in areas that rely on strong currents. However, Neap tides are excellent for fishing dangerous deep-water rock marks where a Spring tide would sweep your gear away immediately.
Pro Tip: Look for the "Tidal Coefficient" number in the Irish Fishing Hub app. A coefficient above 80 indicates a strong Spring tide, while a number below 50 indicates a slow Neap tide.
3. Using the Tide Chart
When you open the Irish Fishing Hub dashboard and view the 24-hour wave chart, you are not just looking at water depth; you are looking at feeding windows.
Two Hours Up, One Hour Down: A classic rule of thumb in Ireland is that the best fishing window is starting two hours before High Water and fishing until one hour after the tide begins to drop (ebb). Fish will push into shallow bays on the incoming tide to hunt for food, and then retreat to deeper water as the tide turns.
Summary
Don't waste hours staring at a motionless rod tip during "slack water." By timing your sessions around the middle hours of a strong Spring tide, your catch rate will skyrocket. Download the Irish Fishing Hub mobile app to access real-time tide data for over 200 locations around Ireland, and fish smarter today.