Silver trevally in Botany Bay reward a presentation that reaches the feeding layer without looking anchored to an oversized sinker. A small bait settling beside a clean weed edge and a light soft plastic worked across a drop-off give you two ways to test that layer. The first question is where the rig travels; the second is whether its movement produces a response.
This guide is for planning a modest estuary session, including the coming summer months. Silver trevally are available year-round in the official local fishing guide, so summer is not presented as a guaranteed peak. The worked session, weights, leader lengths and search intervals below are practical trial settings rather than reports of current catches.
Identify the right trevally
Silver trevally, Pseudocaranx georgianus, occur in southern Australian coastal and estuarine waters. They are laterally compressed, with two dorsal fins, a deeply forked tail and a dark mark on the gill cover. Young fish may show yellowish stripes. Do not identify every small silver fish by colour alone: yellowtail scad and other trevallies require a separate identification check.
The species forms schools and uses bays, estuaries, reefs and sand or gravel grounds. Its food includes worms, molluscs and crustaceans. Those broad biology facts support small soft baits and compact bottom-oriented presentations; they do not establish the contents of a particular Botany Bay school's stomach.
A fish feeding over a flat need not be lying on the seabed. Keep the first lure passes slightly above it and compare the response. There is little advantage in burying a small lure in weed or shell while a school is moving through open water nearby.
Pick accessible water and a clean route
The official Botany Bay guide identifies shore and boat opportunities, and documents the Foreshore Drive boating facilities on the northern side. Check present access, parking and ramp conditions before relying on that description. For a first boat session, select a permitted sheltered flat or drop-off within a sensible return distance rather than making an exposed crossing to follow a rumour.
Use the guide's map and the current closure maps together. An attractive edge near an airport, port structure or reserve boundary is not automatically an available fishing position. In particular, a map of fish habitat is not permission to enter restricted operational water.
Look for the junction of sand and weed, a gentle break into deeper water, or a clean patch beside harder structure. Each provides a way to narrow the search. Cast across the edge so the lure samples both sides, then cast along it if a particular stretch produces interest. Avoid repeatedly retrieving through dense vegetation when you can fish its outer boundary.
Tidal movement changes the path of a light rig. Start when the current allows you to keep contact without excessive weight. That may occur at different stages on different parts of the bay. No universal two-hour bite window is implied, and a tide-table time is not a measurement of current at your chosen edge.
| Situation | Suitable first rig | What to watch | Next adjustment |
|---|---|---|---|
| Clean sand beside weed | Light jig and small plastic | Line movement during the fall | Lift sooner if weed fouls the hook |
| Gentle flow with fish responding to bait | Unweighted or lightly weighted circle-hook bait | Progressive line movement | Change casting angle before adding weight |
| Deeper edge beyond easy contact | Slightly heavier jig | Repeatable bottom reference | Shorten the cast or drift |
| Repeated short taps | Smaller bait or shorter plastic | Exposed hook point and clean gap | Check for bait-stealing fish |
| Fish follow without taking | Same lure at a different speed | Distance of the follow and turn-away | Pause briefly above the bottom |
A light outfit with enough control
A 2–4 kg spinning rod around 7 feet, a 2000–2500 reel and roughly 6–10 lb braid are useful starting choices for open estuary water. Add about 1–1.5 m of 6–10 lb leader. The leader can be increased where shell or harder structure warrants it, but choose a safer open lane if keeping fish clear would require tackle far beyond the outfit.
Monofilament main line is also workable, particularly for short bait casts. Braid helps transmit small movements but demands deliberate slack-line control. Neither option eliminates the need to watch the line.
Seat and test the braid-to-leader knot before fishing. Tie the jig directly for a compact connection, and check the final leader section for abrasion whenever the lure touches rough ground. Keep drag smooth enough to absorb a sudden run; tightening it completely because a trevally circles under the rod can break a light hooklength.
Rig one: a small plastic above the edge
Start with a 3–8 cm wriggler or compact paddle-tail on a size 2–1 jig hook, using a 1–2 g head in shallow, manageable water. Thread the body straight so it does not corkscrew. Match the hook length to the body: a long shank can remove most of a short lure's movement.
Cast slightly ahead of the current or drift. Watch the line while allowing the lure to sink. Establish the approximate time to first bottom contact on a clean patch, then begin later casts a little earlier in the descent so the lure works above the bottom rather than repeatedly touching it.
Make one short lift and allow a controlled fall. A second small lift is an alternative; a long aggressive rip is not necessary as a default. Keep enough contact to recognise a line jump or an unexpectedly early stop, without pulling the lure away throughout its descent.
If the lure never reaches its intended layer, shorten the cast or increase head weight a little. Moving directly from 1 g to a very heavy jig changes the presentation substantially. If it lands hard and snags before you can move it, reduce weight or begin the retrieve sooner.
Try a translucent or natural baitfish-coloured body first in clear water, then a contrasting opaque option if fish appear unable to find it. These are tests of visibility and response, not evidence that a particular colour always works at a particular tide. Keep the size and head weight consistent during the comparison.
When a bite develops, wind into contact and sweep the rod smoothly. The objective is to load the exposed jig hook, not to pull several metres of loose braid through the water. Check a plastic that slides down the hook after a missed bite; a bunched body may mask the point.
Rig two: a slowly settling circle-hook bait
For a contrasting approach, use a size 2–1/0 non-offset circle hook with a small fresh prawn offering or another legally obtained suitable bait. A small piece that leaves the gap clear is better than a large bundle wrapped around the hook.
In very gentle conditions, tie the hook directly to the leader and fish unweighted. If more control is needed, slide a small running ball sinker onto the main line above a bead and small swivel, then attach a 60–100 cm leader and hook. Use the least weight that reaches the lane; a nominal sinker size does not guarantee the same mass across brands.
Cast upstream or up-drift of the target patch and let the bait travel down and across it. Keep the line attended, taking up slack without dragging the bait continuously. When the fish moves away and the line loads, reel steadily. Avoid the sharp strike used with some other hooks: a circle hook needs to rotate into place.
A small, intermittent berley trail can be tested where permitted and appropriate. Keep it controlled and stop if it draws birds or creates an unhelpful feeding frenzy. More feed is not automatically better; a trail swept far outside your casting lane can move the response away from the hook bait.
Compare rigs before changing locations
The bait rig and plastic answer different questions. The plastic covers an edge efficiently and allows repeated depth tests. The bait can remain attractive during a slower drift. If the lure keeps snagging, do not immediately assume bait will solve the problem; both may need a cleaner lane.
Small hard-bodied divers or compact vibes offer another way to search open water, but check running depth and hook configuration before using them beside weed or rough bottom. They are alternatives for a suitable lane, not a reason to drag multiple exposed hooks into a snag field.
Repeated taps with damaged bait suggest feeding activity. No taps and an untouched bait suggest a different problem: position, timing or depth may be wrong. A lure returning with weed on every cast is not a fair test of whether trevally want that lure.
A worked session
Imagine a permitted sheltered edge with roughly 2–4 m of water and modest tidal flow. These are hypothetical conditions, not a marked hotspot or current sounding. Begin with a 5 cm plastic on a 2 g head and a 1.2 m leader. Make a fan of short casts across clean sand toward the weed boundary, recording when the lure reaches its working layer.
After several comparable casts, move the boat or your casting position enough to sample a new part of the edge. If you see fish follow, reduce retrieve speed or add a short pause before changing colour. If you cannot control the sink, adjust angle and weight first.
Compare the circle-hook bait over the same clean patch. A steady take on the bait, after ignored plastics, is useful evidence to slow the presentation. If both approaches remain untouched, inspect the next edge rather than repeatedly feeding the first.
Land fish with a knotless net instead of lifting them on light line. Note the depth, direction of movement and successful rig. Those observations will make the next trip more useful than simply recording a high or low tide.
Local rules and food-safety note
NSW's published saltwater summary lists a 30 cm minimum for silver trevally, a combined trevally daily bag of 10 and possession limit of 20. Check current NSW rules, recreational fishing-fee requirements or exemptions, and the Botany Bay closure maps before fishing. Avoid prohibited airport waters, Alexandra Canal, Penrhyn Estuary and the Towra sanctuary zone; bait collection has additional restrictions.
The official Sydney South guide includes PFAS dietary advice for silver trevally from Botany Bay and the Georges River, with location- and age-specific limits. Consult that advice before retaining fish; a legal-sized catch is not an assurance of unrestricted consumption. Keep handling brief, and choose sheltered water within your boat and weather limits.