Educational information site on the cultural heritage of stone fish weirs around the globe.

4 Chome-5-7 Konan, Minato City
Some images of beautifully preserved #medieval wicker #fishweirs/trap from #Hemington, #England. The area around Hemington is known to have a large number of early fish weirs. Weirs dating to the mid-4th millennium BC have been claimed to exist from the #RiverTrent.1/4
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Underwater Cultural Heritage Of Stone Fish Weirs retweeted
Atlantic Salmon (Salmo salar) running in the Newport River, which forms part of the upper River Mulkear catchment, Co. Tipperary. The River Mulkear joins the River Shannon downstream of the ESB hydroelectric scheme. Salmon can reach these spawning grounds without having to negotiate the Shannon hydroelectric dams. I have watched hundreds of salmon ascend this cascade on the Newport River, on their way to spawning grounds in a catchment of approximately 90 km² upstream of this point. In comparison, the vast Shannon catchment upstream of the hydroelectric scheme covers approximately 10,400 km² - about 116 times larger than this small tributary catchment. Yet Inland Fisheries Ireland reported just 41 salmon ascending through the fish lift at Ardnacrusha during the whole of 2025, with the counter operational throughout the year. I have personally watched more salmon pass the cascade on the Newport River in one afternoon. This is in a catchment less than one percent of this size of the River Shannon catchment upstream of the ESB dams. The conservation limit for the Upper Shannon has been calculated to be 49,638 adult salmon annually. This reflects the spawning requirement associated with the extensive juvenile salmon habitat throughout the cascade catchment. It gives some indication of the scale of the salmon population this vast river system should support. Salmon have declined widely across Ireland and the North Atlantic. However, the declines on rivers with ESB dams are in a league of their own. ESB’s own 2024 report acknowledges that genetic analyses found the original wild salmon stocks above the hydroelectric stations on the Shannon, Erne and Lee to be extinct. That is an extraordinary loss of our natural heritage. ESB recently rebranded its fisheries work as “ESB Sustainable Rivers”. Yet the fundamental problems associated with its hydroelectric operations - obstructed fish passage, turbine impacts, altered river flows, and fragmented salmon habitat - remain unresolved. The branding has changed; the ecological damage has not been remedied. In my opinion, this is pure greenwashing. That such claims can be presented without demonstrating the recovery of these rivers reflects a wider failure of accountability in river management in Ireland.
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Images of a V-shaped fish trap from Fishguard Harbour, Pembrokeshire/Sir Benfro, Wales. Fishguard is believed to have a Norse-derived name, Fiskigardr,“fish enclosure,”. 470 feet of the trap wall remain, the rest being destroyed by the 1900 rail line construction. #coastalhistory
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“Stake net” fishing is an ancient mobile method that uses a series of stakes to moor a leader net to the seabed. It's a mobile fish trap used for 100s of years, with its heyday in the 18th and 19th centuries in Scotland and Ireland. #coastalhistory #muSEAum
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The leader net guides the #salmon into several "pockets" along its length. As the tide ebbs, the pockets are emptied, ensuring the fish are caught "fresh off the tide". Traditionally, fish traps were static and highly regulated by their owners and the local communities.
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The use and rental of the right to use this technique created huge social costs in fishing communities in Ireland and the wider British Isles, as historically dependent fishing communities were sometimes usurped and literally fished out of existence.
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Human net of communities fishing in Wer warat of the #MalukuIslands, #Indonesia. A traditional fishing method involving a long rope bound with coconut leaves, used to enclose fish at low tide and let the whole community spear and net them. 1/3
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@beyond_breakers thanks for the retweet! love your work and you special podcast Keep up the Great stuff!
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Underwater Cultural Heritage Of Stone Fish Weirs retweeted
Atlantic Salmon (Salmo salar) running in the upper River Mulkear catchment over the weekend. This stretch of river forms part of the Lower River Shannon Special Area of Conservation (SAC), where Atlantic Salmon is a Qualifying Interest. The River Mulkear joins the main River Shannon downstream of the hydroelectric scheme. More salmon pass through this cascade and spawn in the upper reaches of this relatively small tributary than do in the vast Shannon catchment upstream of the hydroelectric scheme. According to Inland Fisheries Ireland, only 41 salmon ascended through the fish pass at Ardnacrusha hydroelectric station for the entire of 2024. To put this into perspective, the conservation limit for the Shannon upstream of the Shannon hydroelectric scheme was previously calculated at 49,638 adult salmon annually, reflecting the number of spawning fish needed to populate the extensive juvenile salmon habitat available throughout this catchment.
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As the first steps of the Industrial Revolution took hold across England, other industries had already taken hold along the Atlantic coast. It was a laborious process that turned kelp into essential base chemicals, potash & lime, and was based along the North Atlantic coast. 1/3
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Pillars of smoke common feature of the kelp-production industry from the 17th to the early 20th centuries, producing soda for contemporary industries. Seaweed were gathered and dried to be burned for a time, with pillars of smoke and smouldering along the shore at night. 2/3
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Along with this industry came a material culture & architecture shaped to support the production/transportation of this process material. Ranging from shallow ditches built on the beach to burn seaweed, to kelp kilns & later in large buildings to store the processed kelp.3/3
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During the encirclement, the rope is agitated and beaten up, and this scares fish into a smaller area as the rope is drawn together to form a corral, which is tightened and made smaller and smaller so as to catch them more easily by the communities. 2/3
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The tradition used #Kei #indigenouspeople of #Indonesia who speak an Australasian dialect. Wer warat has become more common, being utilised as part of cultural tourism. Rather than just feeding people with fish, it draws tourists to take part in this community activity. 3/3
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A fitting icon for Mesopotamian mythological fish-human Oannes, an Apkallu, or wise one, passing on antediluvian knowledge of culture and civilisation, teach humankind how to cultivate the soil, and offer sacrifice to the gods. #Assyrian #nimrud #iraq #coastalhistory #muSEAum
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Underwater Cultural Heritage Of Stone Fish Weirs retweeted
Until now, archaeologists had only seen traces of central Germany's Mesolithic structures in soil discolorations. That’s what makes this wooden post exciting. It’s 10,500 years old, and it could be early evidence of building huts and settling down! archaeology.org/news/2026/10…
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Kelp & wrack on the seashore? Nature's chemical storehouse & humans' chemical factory! B&W picture from Co. Antrim in Northern Ireland, 1900, showing seaweed such as Laminaria being collected & burnt in a stone kiln to produce soda, potash, “kelp” later iodine. #coastalhistory
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Drawing of fish smoking in Kamchatka, Russia, 18th Century. This drawing comes from an 18th-century travel book, shows the Indigenous peoples #Itelmen, also called #Kamchadal, found in the #Arctic #Kamchatka Peninsula. It shows the process of butchering and smoking salmon.
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Stone #fishweirs on the shore of Newcastle Beach Co. Down Northern Ireland/UK. The construction of stone fish weirs in the intertidal zone gives us a window into the knowledge and experience local fishing communities must have gathered over the ages. 1/2
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In the case of the ‘Lady Annesley’s traps’ a stone #fishweir located at Newcastle Beach. The beach, has a very gentle slope and an extensive intertidal zone of of almost 400 metres at average low tide, making it an ideal location for building intertidal structures. 2/2
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From the salty sea to up in smoke! 18th century illustration of the smoking of #sardines/#herring in#France. A method of conservation of protein especially with fish that has been part of the human repertoire since the palaeolithic.c and in some respects hasn't changed in ages.
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