Offshore bottom fishing for grouper, snapper, and amberjack requires heavier tackle than most inshore or freshwater fishing, but the rig assembly itself is straightforward. The three rigs below cover the full range of offshore bottom fishing situations from shallow reef to deep structure.
Core Components
| Component | Standard | Heavy (Deep / Big Fish) |
|---|---|---|
| Main line | 50-65lb braid | 80-100lb braid |
| Leader material | 60-80lb fluorocarbon | 80-100lb fluorocarbon |
| Leader length | 36-60 inches | 36-48 inches |
| Main-to-leader connection | FG Knot | FG Knot or Uni-to-Uni |
| Hook | 7/0-9/0 inline circle | 8/0-10/0 inline circle |
| Hook knot | Palomar Knot | Palomar Knot |
| Sinker | 6-16 oz bank or egg | 12-32 oz bank sinker |
| Sinker connection | Sliding on leader | Sliding on main line |
Rig 1: Knocker Rig
The knocker rig is the most widely used offshore bottom rig for grouper in the Gulf and Atlantic. The sinker slides directly on the leader above the hook — it cannot move below the hook because the hook eye stops it. The rig is simple to assemble, highly effective, and minimizes leverage during the fight.
Assembly
- Thread the sinker: Slide a bank sinker or egg sinker onto the main braid. The sinker slides freely up and down the main line.
- Tie the FG Knot: Connect the main braid to the fluorocarbon leader with an FG Knot. The FG knot now acts as the stop for the sinker — the sinker cannot travel from the main line down past the FG knot onto the leader.
- Tie the circle hook: Connect a 7/0-9/0 inline circle hook to the end of the fluorocarbon leader with a Palomar Knot.
- Bait and fish: The sinker contacts the bottom, the leader and hook float just above.
Sinker Size by Depth and Current
| Depth | Minimal Current | Moderate Current | Strong Current |
|---|---|---|---|
| 60-80 feet | 4-6 oz | 6-8 oz | 8-12 oz |
| 80-120 feet | 6-8 oz | 8-12 oz | 12-16 oz |
| 120-180 feet | 8-12 oz | 12-16 oz | 16-24 oz |
| 180-250 feet | 10-16 oz | 16-20 oz | 20-32 oz |
Use the lightest sinker that maintains bottom contact — heavier sinkers reduce bait action and increase line fatigue.
Knocker Rig Hookset
Circle hooks on a knocker rig self-set when the fish picks up the bait and swims away — the line comes tight against the drag and the circle hook rotates to the jaw corner. Keep the drag set at 15-25% of main line strength. When the rod loads with the fish’s weight, lift with steady pressure and start reeling. Do not strike hard.
Rig 2: High-Low Rig (Chicken Rig)
The high-low rig presents two baits at different depths simultaneously — useful on reefs where snapper hold above grouper, or when you want to maximize the chance of a bite from multiple species.
Assembly
Method A — Three-Way Swivel:
- Tie the main line to one eye of a three-way swivel with a Palomar Knot
- Tie a 12-inch dropper of 60-80lb fluorocarbon to the second eye with a Palomar Knot; attach a bank sinker to the end of this dropper
- Tie a 24-30 inch fluorocarbon leader to the third eye with a Palomar Knot; attach a circle hook to the end with a Palomar Knot
- Add a second hook on a 12-inch dropper 12 inches above the three-way swivel by tying a dropper loop in the main leader
Method B — Double Loop Leaders (Simpler):
- Thread the sinker onto the main line above the knot
- Tie the main line to a 36-inch fluorocarbon leader (FG Knot)
- Tie a circle hook to the bottom of the leader (Palomar Knot)
- Tie a 10-inch dropper loop in the leader approximately 18 inches above the bottom hook using a Dropper Loop Knot
- Attach a second circle hook to the dropper loop with a loop-to-loop connection or a direct Palomar tie
Recommended spacing: Bottom hook 6-8 inches above the sinker; upper hook 18-24 inches above the bottom hook.
High-Low Rig Advantages
- Two bites simultaneously possible — doubles chance of action
- Upper hook targets snapper and smaller species holding off the bottom
- Bottom hook targets grouper and larger bottom fish
- Most effective when the bottom has mixed species on the same structure
Rig 3: Fish Finder Rig (Live Bait)
For live bait presentations targeting grouper or amberjack, a sliding sinker fish finder rig allows the bait to swim naturally in any direction while the sinker stays on the bottom.
Assembly
- Thread a sinker slider (egg sinker clip) or open barrel swivel snap onto the main line
- Attach an appropriate sinker to the snap (6-12 oz depending on depth and current)
- Tie the main line to a ball bearing swivel with a Palomar Knot
- Tie a 36-48 inch fluorocarbon leader to the other eye of the swivel with a Palomar Knot
- Tie a 7/0-9/0 circle hook to the end of the leader
The live bait can swim 36-48 inches in any direction around the sinker while the weight stays on the structure.
Best live bait: Pinfish (6-8 inches), grunts (6-8 inches), cigar minnows, goggle-eyes, blue runners, and mullet. For amberjack, large live baits (8-12 inch blue runners or large pinfish) draw better strikes than smaller baits.
Terminal Knots Reference
| Connection | Knot | Notes |
|---|---|---|
| Braid to fluorocarbon leader | FG Knot | Pre-tie at dock; best strength |
| Braid to leader (field retie) | Double Uni Knot | Faster; reliable |
| Fluorocarbon to circle hook | Palomar Knot | Seat with pliers on heavy fluoro |
| Fluorocarbon to three-way swivel | Palomar Knot | Same as hook tie |
| Dropper loop (mid-leader) | Dropper Loop Knot | For second hook on high-low rig |
Circle Hook Regulations
Federal regulations require inline (non-offset) circle hooks when fishing with natural bait for reef fish (grouper, snapper) in the Gulf of Mexico Exclusive Economic Zone and in the South Atlantic EEZ. Offset circle hooks do not qualify. Carry only inline circle hooks on offshore bottom fishing trips to avoid regulatory issues.
Related Guides
- Best Knots for Grouper and Snapper — species-specific knot and tackle guide
- Best Knots for Amberjack — live bait and jigging setups for AJ
- How to Rig a Circle Hook — circle hook technique, bait presentation, and hookset
- FG Knot — full step-by-step for the braid-to-leader connection