Thorney Island

Thorney Island is a sheltered Chichester Harbour mark rather than an open-coast beach, offering varied estuary fishing along public sections of its seawall, hard edge and channel margins. It can produce enjoyable mixed fishing, but access is constrained by the Ministry of Defence presence and the best water is highly tide-dependent.

• Expect shallow, coloured harbour water, mudflats and saltmarsh rather than long casting over surf.
• It is most worthwhile for anglers prepared to move with the tide and fish quietly around deeper channels and flooded margins.
• Do not treat the whole island as an unrestricted fishing venue: public access and permitted fishing locations must be confirmed on arrival.

Thorney Island lies at the northern end of Chichester Harbour, south of Emsworth, with the Emsworth Channel on its western side and Thorney Channel to the east. The island is connected to the mainland, but much of it is associated with the MOD and access arrangements can change.

• Public rights of way and the harbour-side perimeter route are the relevant access routes; stay on signed public paths and use only clearly public shoreline.
• Do not enter through military gates, cross restricted land, climb fences or assume that a seawall or track is public simply because it appears accessible.
• The western and eastern harbour margins fish differently according to wind, tide and the amount of water moving through the adjacent channel.
• Much of the shore becomes mudflat at low water, so the practical fishing window is usually centred on the flood, high water and early ebb.
• Approach and parking details should be checked immediately before travel, as local restrictions, gates and MOD requirements may alter access.

Thorney Island is a mixed harbour mark, with fish presence changing markedly through the seasons and according to salinity, temperature and bait availability. It is better viewed as an estuary and harbour venue than a place for reliably large open-sea species.

• Bass are a principal target in warmer months, especially where a flooding tide covers shallow feeding ground.
• Flounder are a traditional autumn and winter possibility over muddy and sandy harbour margins.
• Thin-lipped and thick-lipped mullet may show in calm, clear conditions, particularly around harbour edges and areas with natural food.
• Gilthead bream can occur in Chichester Harbour in the warmer part of the year; crab, worm and small shellfish baits are sensible options where they are present.
• Eels, school whiting, pouting, small pollack around suitable structure, and occasional dogfish or rays may feature depending on the exact swim and season.
• Small fish are common in this shallow harbour environment, so return unwanted fish carefully and avoid assuming every capture is a keeper-sized specimen.

Light-to-medium estuary tackle is generally more useful here than heavy beachcasting gear, although enough lead is needed to hold in a running channel. Match the method to the depth and current immediately in front of the chosen public bank.

• A two- or three-hook flapper or clipped-down rig baited with ragworm, lugworm, peeler crab, mackerel strip or squid can cover mixed bottom-feeders.
• For flounder, use a simple flowing or long-trace presentation with worm, ragworm or a small strip bait, keeping the bait moving naturally where practical.
• For bass, fish fresh peeler crab, ragworm or a fish bait close to channel edges on the flood; use sensible hook sizes and avoid over-heavy terminal tackle in shallow water.
• Mullet demand a quieter, more specialised approach: light float or freelined bread, small hooks and minimal disturbance are often more productive than static ledgering.
• A modest cast is often enough. Casting beyond the productive gutter, or into distant mud, can be less effective than placing bait accurately along a deeper edge.
• Use tackle that allows a fish to be released in good condition, including a landing net where the bank or wall makes lifting unsafe.

Tide is the key to Thorney Island. At low water, extensive mud and shallow ground can leave little fishable depth, while the incoming tide brings fish onto newly covered margins and concentrates them along creeks and channels.

• Start around the latter part of the flood where a safe, public position allows, and continue through high water into the first part of the ebb if the current remains manageable.
• The strongest flow is usually found in the channels and around constrictions; increase lead weight only enough to maintain contact with the seabed.
• High water can be especially useful for bass, mullet and bream moving over shallow feeding areas, while a dropping tide may focus fish off channel lips.
• Calm, warm conditions can favour mullet and gilthead bream, whereas some colour and movement in the water can help conceal bass and improve confidence for bait fishing.
• Wind direction matters: exposed sections can become uncomfortable and difficult to fish in a strong onshore wind, while sheltered water may become very murky after prolonged weather.

The main hazards are deep soft mud, slippery harbour defences, fast tidal flow and the possibility of restricted military land. This is not a venue for walking out across the foreshore to reach water.

• Never attempt to cross mudflats or creeks on foot; soft sediment, hidden channels and a rising tide can cut off an angler very quickly.
• Fish from a stable, lawful bank, path-side edge or other clearly accessible public position, and keep well back from unstable margins.
• Wear footwear with grip, carry a headtorch if fishing near dusk, and avoid lone sessions in poor weather or darkness where access is unfamiliar.
• Take particular care around seawalls, steps, moorings and algae-covered hard surfaces, which can be extremely slippery.
• The terrain is uneven and some routes are narrow, rough or soft underfoot, so accessibility for anglers with reduced mobility is limited and should be assessed in person.
• If any MOD instruction, gate, warning board or temporary closure is in place, comply immediately and choose another mark.

Facilities directly on Thorney Island should not be assumed, especially around the restricted areas. It is best treated as a self-sufficient session, with supplies obtained before reaching the shoreline.

• Bring drinking water, bait, food, a first-aid kit, rubbish bags and any spare terminal tackle you may need.
• Nearby Emsworth has shops, food outlets and other town facilities, but anglers should not rely on facilities being open at the start or end of a tide.
• Parking is limited by local roads, private access and possible restrictions; park only where expressly permitted and never obstruct gates, farm access, residents or emergency routes.
• There may be no convenient toilet, tackle shop or safe night-time refuge at the fishing area itself.
• Keep vehicles and kit discreet, and leave no line, bait packaging or other litter on the harbour edge.

Thorney rewards observation more than brute-force casting. A short reconnaissance visit around different states of tide can reveal which public stretches retain water, where fish move and whether a chosen area is genuinely fishable.

• Arrive early enough to walk the permitted route in daylight and identify a safe place to fish before the water rises.
• Watch for birds working, mullet rolling, small baitfish and the subtle darker lines that often indicate a channel or gutter.
• Fresh ragworm and peeler crab are strong all-round harbour baits; carry a second option such as mackerel strip or squid for scent and durability.
• Travel light enough to move if the tide exposes the ground or the flow becomes too strong, but take a chair only where the path and bank safely accommodate it.
• Keep noise and light to a minimum, particularly at dusk, as this is a quiet harbour environment and fish may feed close in.
• A landing net, disgorger and wet unhooking surface are worthwhile because small bass, flounder and other undersized fish are likely.

Fishing is not automatically banned at Thorney Island, but the MOD presence, harbour controls and local land ownership mean that legality depends on the exact place from which you intend to fish. Check current official notices before every trip rather than relying on old reports or online catch accounts.

• Obey all MOD signs, barriers, access instructions and temporary closures; do not fish from, enter or cross land that is not clearly open to the public.
• Follow Chichester Harbour Conservancy rules and any local byelaws affecting access, bait collection, moorings, navigation channels, protected habitats and foreshore activity.
• Check current UK rules for bass, including any seasonal restrictions, minimum-size requirements, bag limits and permitted methods; these rules can change.
• Check the current legal minimum sizes and any retention restrictions for all species before keeping fish.
• Do not collect bait, dig worm, remove shellfish or disturb saltmarsh and mudflat habitat unless it is lawful and permitted at that specific location.
• Respect navigation: do not cast across channels used by vessels, fish from unsafe structures, or leave tackle where it could obstruct harbour users.