Single-zone SST guide
Longbill Spearfish water temperature at Block Island Canyon Complex.
Tetrapturus pfluegeriBillfishMay: absent
Typical May SST in Block Island Canyon Complex is 52–60°F. Longbill Spearfish prefer 68–79°F with peak activity in 72–77°F.
Longbill Spearfish SST threshold
Outside toleranceSuboptimalGoodPeak·Dashed line = hard threshold
Year-round overlap with Block Island Canyon Complex SST
Where the Block Island Canyon Complex typical monthly SST band overlaps with longbill spearfish's preferred and optimal ranges, the species is in range.
Peak overlapFishable (preferred range)Outside preferred range
Best months
July, August
| Month | Zone SST | Status |
|---|---|---|
| Jan | 42–48°F | Outside |
| Feb | 42–48°F | Outside |
| Mar | 44–50°F | Outside |
| Apr | 46–54°F | Outside |
| Maynow | 52–60°F | Outside |
| Jun | 60–68°F | Outside |
| Jul | 65–75°F | Peak |
| Aug | 68–78°F | Peak |
| Sep | 64–72°F | Fishable |
| Oct | 56–64°F | Outside |
| Nov | 50–58°F | Outside |
| Dec | 44–52°F | Outside |
Best months
August
Spearfish are bycatch on white marlin and tuna trolls in canyon waters. They eat the same baits as whites but ride deeper. Most encounters are accidental.
Verify with current SST imagery
These ranges are climatological norms. Actual SST varies year over year — get an SST satellite shot the day before you run.
Live SST imagery for Block Island Canyon Complex.
Bield: Fish overlays current NOAA CoastWatch SST onto your chartplotter view and alerts you when Block Island Canyon Complex hits longbill spearfish's optimal 72–77°F window.