Spring Pelagic Fish in San Diego: Bonito and Mackerel Seasons Explained
Spring transforms San Diego’s offshore waters into a feeding ground for some of the most exciting pelagic species available to spearfishers. Bonito and mackerel migrations create a predictable window of opportunity—but only if you understand the timing, location, and conditions that bring them in.
When Spring Runs Begin
Bonito season in San Diego typically opens in April and peaks through May and June, though warm water years can see early arrivals in late March. Pacific mackerel follow a similar timeline, with numbers building as water temperatures climb. The trigger is simple: water temperature. When the Pacific warms above 60°F, these baitfish hunters move closer to the coast, following the same forage that brings them north every year.
By July, both species are established in nearshore and offshore zones. However, the spring window (April–June) is when they’re most aggressive and least pressured compared to summer months when recreational boats saturate the traditional grounds.
Where to Find Them
Nearshore: Bonito and mackerel school in the shallower banks and reefs along San Diego’s coast. The La Jolla Kelp consistently holds bonito in spring, particularly around the deeper edges where structure meets open water. Point Loma and the Coronado Islands are reliable for both species, especially on the seaward side where current flows attract baitfish.
Offshore: The San Diego Trough and waters beyond Coronado Islands (15–30 miles out) hold larger bonito and mackerel schools in spring. This is where you’ll find aggressive feeding in cleaner water and less competition from recreational anglers.
Kelp forest edges are critical. Bonito use kelp as cover and hunting ground. Work the outside perimeter of dense kelp patches at Sunset Cliffs, Torrey Pines, and Mission Beach in April and May when the canopy is full and baitfish are concentrated.
Understanding the Species
Pacific Bonito are the spring prize. They’re faster, stronger, and more aggressive than mackerel, with torpedo-shaped bodies built for sustained pursuit. Spring bonito in San Diego average 8–15 pounds, though specimens to 20+ pounds are possible. They hunt in schools and respond to schooling baitfish behavior—when you see activity, there are bonito nearby.
Bonito are visual hunters and prefer clearer water. They’ll investigate movement quickly but spook easily in murky conditions. Spring visibility in San Diego (typically 40–80 feet) is ideal for bonito hunting.
Pacific Mackerel are smaller but numerous. Spring mackerel runs can produce 50+ fish per dive in the right location. They’re less selective than bonito and will chase almost anything moving at speed. Mackerel are your confidence builder if bonito aren’t cooperating—and they’re excellent eating.
Seasonal Conditions and Tactics
April conditions are variable. Upwelling can chill the water and push fish deeper or further offshore. Watch the Element app for water temperature trends—when temps start climbing consistently, move closer to kelp and shallower breaks.
May and June offer the most stable conditions. Water temperatures settle in the 62–68°F range, visibility improves, and schools move into predictable zones. This is when you’ll see the most consistent action.
Spring tides (new and full moon) create stronger current flow, which concentrates baitfish and brings predators into tighter feeding zones. Plan your dives around spring tide windows for maximum opportunity.
Gear and Approach
Bonito and mackerel demand versatility. Bring a 6–7mm wetsuit for April; by June, 5mm works in most conditions. Use a mid-size gun (35–45 cm) with decent kinetic energy—these fish move fast and a marginal shot misses.
Camo or neutral coloring matters more in spring’s clearer water than summer. Blue or dark gray wetsuits work better than bright colors.
Approach technique is everything. Bonito hunt by sight; move slowly and deliberately toward schools rather than chasing. Mackerel are less cautious—aggressive pursuit often works. Use the sun position to keep it at your back, reducing your silhouette against the light.
Reading the Conditions
Use the Element app to track water temperature, swell, wind, and visibility. When spring storms pass and swells drop below 4 feet with light wind and rising temperatures, conditions are prime. Bonito and mackerel feed most aggressively in the 2–3 days following a swell as water clarity improves and baitfish stabilize.
Avoid high-wind periods (March and April can be windy)—rough surface conditions make spotting schools harder and reduce visibility underwater.
Final Notes
Spring bonito and mackerel seasons reward preparation and local knowledge. Scout your target zones, check conditions regularly, and dive when water temperature and clarity align. The Element app provides real-time conditions to help you time your trips for maximum success.
Track water temperature, swell, and wind patterns in the Element app to dial in your spring pelagic dives and capitalize on San Diego’s best bonito and mackerel runs.