Spearfishing Calico Bonito: A Seasonal Target for San Diego Summer Divers
Calico bonito are one of San Diego’s most reliable summer targets for spearfishers. Fast, aggressive, and abundant during peak season, they offer excellent sport and table fare. If you’re planning a summer dive trip, understanding when and where to find them—and how to approach them—will dramatically improve your success rate.
When Calico Bonito Arrive in San Diego Waters
Calico bonito (Sarda chiliensis) show up off San Diego starting in late May, with numbers building through June and peaking in July and August. By September, they’re still present but less concentrated. They follow baitfish schools northward during the warmer months, then migrate back offshore as water temperatures drop in fall.
Water temperature is the primary trigger. When the Pacific warms to 65–70°F, bonito move into shallower structure and reefs. Monitor Element’s water temperature data for your preferred dive spots—when you see sustained warming into the mid-60s, it’s time to check your speargun.
Best San Diego Locations for Calico Bonito
Kelp forests and rocky reefs are prime habitat. Bonito hunt baitfish in and around structure. Key summer spots include:
- Torrey Pines/La Jolla Shores area: Shallow kelp beds (30–50 feet) and rocky points. Excellent visibility and consistent bonito presence mid-summer.
- Bird Rock and Sunset Cliffs: Deeper structure (40–70 feet) where larger bonito hunt. Current-dependent but productive.
- Ocean Beach Pier to Coronado: Sandy bottom with rocky patches. Bonito often cruise the drop-offs hunting mackerel and sardines.
- Point Loma reefs: Reliable mid-summer bite in 35–55 feet of water. Early morning dives often yield better results.
Bonito aren’t confined to deep water—they’ll hunt in 25 feet if baitfish are present. Check your local conditions app before heading out; visibility, current direction, and water temperature all influence where they’ll be feeding.
Reading Bonito Behavior and Movement Patterns
Calico bonito are ambush feeders. They patrol structure edges, cruising along kelp lines and reef transitions where baitfish congregate. Unlike tuna, bonito are more predictable and less wary.
Key behavioral cues:
- Baitfish activity: Where you see mackerel, sardine balls, or small jacks, bonito are usually nearby. Watch for surface disturbance—bonito often feed aggressively in shallow water.
- School structure: Bonito often travel in small groups (3–8 fish). If you spot one, others are nearby.
- Time of day: Early morning (dawn through mid-morning) and late afternoon produce better bites. Midday feeding slows in clear water.
- Current lines: Bonito position themselves on current edges where baitfish are swept past. Dive downcurrent of rocky structure.
Spearfishing Tactics for Calico Bonito
Approach and presentation:
Bonito have good eyesight but aren’t as spooky as yellowtail. Approach slowly and stay low in the water column. Avoid sudden movements. If you see a school, don’t chase—position yourself in their path and let them come to you.
Use a medium-power speargun (18–24 inches). Bonito are fast and tough; underpowered shots often result in lost fish. A 7–8mm band setup or pneumatic gun works well.
Bait and decoys:
Live bait isn’t practical while freediving, but if you see bonito actively feeding on a baitfish school, position yourself downwind and wait. A wounded mackerel or sardine on a line can attract attention, but most successful bonito spearfishing is sight-hunting and stalking.
Shot placement:
Aim for the head or just behind the gills. Bonito are built for speed; a poorly placed shot in the body won’t stop them. A solid head shot is clean and effective.
Regulations and Ethical Considerations
California requires a valid fishing license and a spearfishing certification (or hunter safety course). Bonito have no minimum size limit in California state waters, but respect local MPA (Marine Protected Area) boundaries. Check current regulations before heading out—restrictions change seasonally.
Bonito are excellent eating. Bleed them immediately, ice quickly, and cook within 24 hours for best flavor. They’re lean, firm, and excellent grilled or smoked.
Summer Timing: Plan Your Dives Now
July and August are peak season. Water is warmest, visibility is typically best (60–80 feet on good days), and bonito density is highest. If you’re planning a summer dive trip to San Diego, target the kelp forests and rocky reefs when conditions align—calm seas, warm water, and good visibility create the ideal scenario.
Use Element to track water temperature, swell, wind, and visibility forecasts. Bonito season is short; when conditions are right, get in the water.
Ready to hunt calico bonito this summer? Download Element to track real-time water conditions, visibility forecasts, and swell patterns for San Diego’s best spearfishing reefs.