How to Hunt Bonito in San Diego’s Open Water Summer Runs

Bonito are the ultimate summer target for San Diego spearfishers. Fast, aggressive, and abundant from June through September, they offer exciting hunting opportunities in open water and around structure. Unlike calmer winter species, bonito demand precision, speed, and understanding of seasonal movement patterns. Here’s how to consistently connect with them.

When Bonito Arrive in San Diego

Pacific bonito (Sarda chiliensis) typically show up in San Diego waters by late May, with peak activity from July through early September. Water temperature is the key trigger—bonito move in when the Pacific heats above 68°F, usually around the summer solstice. By August, water temps around San Diego often push into the low 70s, and bonito become aggressive feeders.

You’ll see them most reliably in late summer when baitfish schools are at their thickest and water clarity improves. September offers some of the year’s best visibility and bonito density before they begin their fall migration southward.

Prime San Diego Bonito Zones

Offshore Reefs and Kelp The 9-Mile Bank, Coronado Islands, and Point Loma’s deeper reefs are bonito magnets. These areas concentrate baitfish and provide structure where bonito ambush prey. Early morning and late afternoon produce the most reliable hunting windows.

Kelp Forest Edges La Jolla Shores, Mission Beach, and Pacific Beach kelp forests host bonito throughout summer. Work the kelp edges where bonito hunt in the transition zone between open water and dense canopy. Current-driven areas where kelp sways create feeding opportunities are hotspots.

Open Water Runs When bonito are feeding hard—usually mid-morning to mid-afternoon—they’ll cruise open water hunting baitfish schools. Spotting working birds or baitfish disturbance is your signal to position yourself in their path. San Diego’s clearer August waters make spotting these feeding runs much easier than spring conditions.

Gear and Weapon Setup

Spearguns A mid-range pneumatic or shaft gun (40–50 lb) is ideal. Bonito are fast and require immediate penetration. Avoid overpowering your gun—excessive force creates unnecessary drag and can bend shafts on aggressive runs.

Shafts and Tips Use sharp, streamlined shafts with slip tips. Bonito have tough, slick skin—dull tips bounce off. Carry multiple shafts; bonito runs are energetic, and you may need to reload quickly if a school is feeding.

Wetsuits A 3mm spring suit works for July–August, but September water cools slightly. Bring a 5mm if you’re hunting early mornings or expect extended bottom time.

Weighting Bonito hunting often requires neutral buoyancy or slight negative trim to hold depth in open water. Weight yourself conservatively—you want to move fluidly, not sink heavily.

Hunting Technique

Approach Strategy Bonito are alert and fast. Never hunt them head-on; instead, position yourself ahead of feeding activity and let them come to you. Move slowly and deliberately between hunting spots. Avoid sudden movements that trigger panic.

Depth and Positioning Bonito often hunt at 25–50 feet in summer, though they’ll chase baitfish shallower during feeding frenzies. Descend to 30–40 feet and wait. Patience beats random swimming. If you spot a school, position yourself slightly deeper and let them pass through your zone.

The Shot Bonito present a small, moving target. Aim for the head or shoulder—a clean brain shot ensures a quick kill and prevents long, exhausting battles in open water. Lead your target by 1–2 feet depending on speed and distance. Expect a violent run immediately after a solid hit; keep your gun hand relaxed and let the line play.

Solo vs. Buddy Hunting Hunt bonito with a partner. One person watches for surface activity while the other focuses on underwater positioning. If a fish is hit, your buddy can spot the location and assist if needed. Open water hunting demands backup.

Seasonal Timing and Conditions

July is prime bonito season—warm water, good visibility, and aggressive feeding behavior. August offers the most reliable conditions, though heat can push fish deeper mid-day; hunt early and late.

September brings cooler mornings and often the clearest water of the season. Bonito are still abundant but begin moving south by late month. Don’t miss early September runs.

Avoid June and early July unless water temps are consistently above 70°F. Cold water makes bonito sluggish and scattered.

Final Notes

Bonito hunting rewards preparation and patience. Scout your zones beforehand, check Element for real-time water temperature and visibility data, and plan your hunts around peak feeding windows. Respect the fish—bonito are strong, fast, and deserve a quick, ethical kill.

Use Element to track water temps, swell, and visibility across San Diego’s prime bonito zones and time your hunts for peak conditions.