The River Ebro

The Ebro that anglers fish is not the river the geography describes. A chain of large dams on the lower river converts long reaches into deep, slow, warm reservoir water, and what runs below them is released rather than rained.

THE CONSEQUENCES ARE ECOLOGICAL, NOT JUST SCENIC. Slow warm water with a long growing season, abundant forage fish, and deep basins that hold temperature suits large predatory fish extremely well. It suits the river's native Iberian fishes — many of them small, endemic, adapted to seasonal Mediterranean rivers that run hard in winter and shrink in summer — considerably less well.

THE LEVEL IS AN OPERATIONAL DECISION. Reservoir drawdown and release for irrigation and power mean the water can move substantially without weather, which changes where fish are and where a bank angler can stand. A visitor who reads the sky rather than the release schedule has read the wrong thing.

AND THE TAILWATERS ARE THEIR OWN HABITAT: cooler, faster and more oxygenated than the reservoir above, holding different fish and fishing differently.

WELS CATFISH are the reason most visitors come. Europe's largest freshwater fish, native to eastern and central Europe rather than to Iberia, introduced to the Ebro system in the twentieth century, and grown there to sizes that made the river famous.

COMMON CARP reach large weights in the warm productive reservoirs and were the species that brought the first wave of British anglers.

ZANDER are present and are likewise introduced, occupying the deeper coloured water where their low-light vision gives them an advantage.

LARGEMOUTH BASS, a North American species, are established in the warmer shallow arms.

NATIVE IBERIAN FISHES are the other half of the story and are rarely the reason anyone travels. The peninsula holds a distinctive endemic freshwater fauna — barbels, nase and chub found nowhere else — and a substantial proportion of it is assessed as threatened, with introduced predators, water abstraction and habitat alteration among the identified pressures.

HOLDING BOTH FACTS AT ONCE is the only honest position. The Ebro is a remarkable angling destination and an altered ecosystem, and it is the same set of introductions that produced both.

CATFISH FROM THE BANK is the accessible starting point: heavy static tackle, large baits, and long waits punctuated by a fish that changes the scale of everything a British angler owns.

CATFISH FROM A BOAT opens the deep water, and with it the continental methods. Vertical fishing over marked fish in deep basins is a boat-and-electronics discipline. Clonking — striking a shaped tool on the surface to produce a sound that draws catfish up — is a technique with no British parallel at all, and one whose permissibility varies between jurisdictions.

CARP FISHING on the reservoirs is recognisably the British discipline scaled up, with bank access, baiting and long sessions.

PREDATOR LURE FISHING for zander and bass works the timber, the drop-offs and the shallow arms respectively, and is closer to a European lure culture than to a British one.

AND GUIDING IS NORMAL HERE in a way it is not on British coarse water. Much of the visiting fishery runs through operations that supply boats, local knowledge and the licensing route, and for a first visit that is a sensible way to arrive rather than an admission of defeat.

The Ebro's season is governed by heat and by reservoir operation rather than by a British-style close season calendar.

SPRING brings warming water, pre-spawning catfish activity and carp coming onto the shallows, and it is widely regarded as the strongest period for large fish.

EARLY SUMMER continues that while the water is still fresh and levels are high.

HIGH SUMMER is hot enough to make the middle of the day unfishable for the angler and to push fish deep and nocturnal. Sessions move to dawn, dusk and dark. This is also when reservoir drawdown for irrigation is at its most significant.

AUTUMN cools and re-concentrates fish, and predator fishing improves as forage shoals tighten.

WINTER is a real winter inland — cold, with clearer water and much slower catfish — and it is the period when the river fishes least like its reputation.

CLOSE SEASONS AND PERMITTED PERIODS ARE A REGULATORY MATTER, they differ between autonomous communities and species, and they are not stated here.

SILURO is the wels catfish, and it is the word on the signs, the guide listings and the shop shelves. A visitor asking for catfish tackle in English will be understood; a visitor reading local information will need the Spanish.

EMBALSE means reservoir. Mequinenza and Riba-roja are embalses, and the word carries the information that the level is operated rather than natural — which is the single most useful thing to know about them.

CLONK names both the tool and the method: a shaped implement struck on the water over deep basins to draw catfish. There is no British equivalent technique and therefore no British word.

RIU EBRE is the Catalan name for the river, used along the lower reaches. Official information, signage and local reporting may use either form.

AND BOGA, BARBO and MADRILLA are among the names for the native Iberian fishes a visitor will hear and will probably not catch, which is worth knowing because they are the part of the fauna the introductions bear on.

THE STRUCTURAL POINT FIRST. Spain administers inland fishing through its autonomous communities rather than through a single national licence. The Ebro crosses several of them. So the question 'what licence do I need for the Ebro' has no single answer — it has an answer per stretch, and the stretch is defined by which community's territory the bank belongs to.

PERMISSION IS TYPICALLY LAYERED: the community licence to fish at all, any authorisation attaching to a specific water or reserve, and separate arrangements for boat fishing.

NON-NATIVE SPECIES RULES ARE THE ONES VISITORS MOST OFTEN GET WRONG. Spain manages introduced species actively, and measures affecting the retention, transport and live use of introduced fish have been revised repeatedly at both national and regional level. A visitor's assumption carried from another country is the least reliable guide available.

PROTECTED AREAS along the river and in the delta add their own constraints.

AND BIOSECURITY IS A GENUINE OBLIGATION rather than a formality: this is a system that demonstrates what moving species between waters does, and cleaning and drying gear between waters is the practice that limits it.

FISHINGHQ STATES NO CURRENT RULE. Identify the autonomous community for the stretch, obtain the licence from that community, and confirm the current species-handling position with it before fishing.

The Ebro's angling reputation is recent and its history is a travel history rather than a local one.

THE CARP CAME FIRST. Through the 1980s and 1990s British carp anglers, running out of large fish at home, began travelling to continental waters, and the Ebro reservoirs offered warm productive water with large fish and straightforward access. A guiding and holiday industry grew around that traffic.

THE CATFISH CHANGED THE SCALE. As the introduced wels population matured, the river began producing fish larger than anything in British fresh water by an order of magnitude, and the destination shifted from a carp trip to a catfish trip.

THE LOCAL HISTORY IS OLDER AND DIFFERENT. The Ebro basin has supported river fisheries, mills, weirs and tenurial fishing rights for many centuries, in the same broad European pattern of river fishery as private, granted and contested property that shaped medieval and early-modern practice across the continent.

AND THE DAMS ARE THE HINGE. The twentieth-century damming that created the reservoirs created the habitat that the introductions then filled. The fishery a visitor books today is roughly seventy years old and is an artefact of hydroelectric policy.

The Ebro's dangers are the three that a visiting angler is least likely to have planned for, and they are unrelated to each other, which is why they are worth stating together.

THE FIRST IS THE HEAT, AND IT IS NOT A COMFORT PROBLEM. Summer air temperatures in the Ebro valley routinely reach the high thirties and beyond, the banks are open, the shade is limited, and the fishing that draws people here is a long-session fishery in which somebody sits still for many hours. Heat illness develops in exactly those conditions: sustained exposure, inadequate fluid, and a person who is concentrating on something else. It progresses from feeling unwell to being unable to make decisions, which means the person who should recognise it is the person who has lost the capacity to. Plan the fluid before the session rather than during it, take the middle of the day out of the water, and treat somebody becoming confused or stopping sweating as an emergency rather than as tiredness.

THE SECOND IS THAT THIS RIVER IS OPERATED. The Ebro is heavily dammed for hydroelectricity and irrigation, and the level below a dam is a function of what the operator is doing rather than of the weather. Water can rise substantially and quickly with no rain anywhere, and it can fall the same way, stranding a boat or leaving a bank that was fishable an hour ago as a mud slope above a drop. A river whose level is decided by a control room does not give the warnings a rain-fed river gives, and the correct assumption is that the level you arrive to is not the level you will leave.

THE THIRD IS THE CATFISH, AND IT IS A HANDLING PROBLEM RATHER THAN AN ATTACK. Wels catfish here reach a size at which the fish is a physical object comparable to the person holding it. The mouth has no teeth in the cutting sense but is lined with dense pads of tiny recurved teeth that grip, and the conventional lip-grip on a large one puts a forearm inside a mouth that closes. The injury is abrasive rather than penetrating and it is unpleasant rather than dangerous — but a large fish that then rolls, in water, with an arm inside it, is a drowning mechanism rather than a graze. Handle large catfish in the water where possible, do not put an arm inside the mouth of a fish you cannot control, and never do it in water above knee depth.