Menu

Ireland's sailing, boating & maritime magazine

Displaying items by tag: tidal

A unique new tidal guide assisting river users to circumnavigate the city’s waterways was launched yesterday at the River Lee Hotel. CORKUMNAVIGATION is a pocket-sized map published by Cork’s community boatyard, Meitheal Mara. The guide is aimed at helping locals and visitors alike discover the city from a new angle by kayak, canoe or rowing boat. See link below to purchase the guide.

According to Cathy Buchanan of Meitheal Mara, ''very few people know that you can actually row or paddle all around the city, and experience a very different and special side of Cork. As several of the bridges are particularly low and some weirs quite high, they can only be passed at certain tides. With the CORKUMNAVIGATION guide you can successfully navi­gate the city’s 29 bridges and eight weirs at vari­ous stages of the tide.''

Niamh Twomey, Cork City Council Heritage Officer, added ''The River Lee is one of the great unexploited spaces in Cork, offering a beautiful route around the historic city centre. This guide will give the growing number of river users the opportunity to experience the natural and built heritage of Cork from the River Lee. The guide also includes quirky historical facts contributed by the late Cían Ó Sé.''

corkumnavigate your way around the city 4

Corkumnavigate Cork city's 29 bridges and eight weirs with this latest pocket guide.

Originating near Gougane Barra in the Shehy Mountains, the River Lee flows east towards Cork City where it splits into two channels, form­ing the city's central island. Medieval Cork was a network of small river channels, which over the centuries have been covered in to leave just the north and south channels open. The river derives its name from the Irish "Laoi", meaning torrent or flood.

CORKUMNAVIGATION is a Meitheal Mara project, sponsored by Cork City Council and the River Lee Hotel. Fieldwork for the project was conducted in 2010 by the Cork Centre for Architectural Education, UCC and CIT, and sponsored by the Heritage Council.

The CORKUMNAVIGATION guide is available from Meitheal Mara via Afloat's Marine Market. Click HERE

Published in Book Review

#coastguard – Belfast Coastguard are issuing a warning following the Met Office forecast for rain during the remainder of Sunday and for strong winds or gales on Monday. The Northern Ireland and Scottish Coastline is expected to get hit with strong winds and high tides to produce large over-topping waves and another tidal surge, with the east coast particularly at risk.

Belfast Coastguard Rescue Co-ordination Centre manager, Steven Carson, said:

"With one of the worst tidal surges in recent years, we would urge members of the public to take extra care along our coastline at this time. Please stay away from coastal paths, sea walls and cliff edges. These types of conditions, with choppy seas and large waves, are likely to be with us for a few days yet, so please don't take risks. If you do get into difficulty, or spot someone else in trouble, call 999 straight away and ask for the Coastguard."

Published in Coastguard

Sharks in Irish waters

Irish waters are home to 71 species of shark, skates and rays, 58 of which have been studied in detail and listed on the Ireland Red List of Cartilaginous fish. Irish sharks range from small Sleeper sharks, Dogfish and Catsharks, to larger species like Frilled, Mackerel and Cow sharks, all the way to the second largest shark in the world, the Basking shark. 

Irish waters provide a refuge for an array of shark species. Tralee Bay, Co. Kerry provides a habitat for several rare and endangered sharks and their relatives, including the migratory tope shark, angel shark and undulate ray. This area is also the last European refuge for the extremely rare white skate. Through a European Maritime and Fisheries Fund (EMFF) project, Marine Institute scientists have been working with fishermen to assess the distribution, diversity, and monthly relative abundance of skates and rays in Tralee, Brandon and Dingle Bays.

“These areas off the southwest coast of Ireland are important internationally as they hold some of the last remaining refuges for angel shark and white skate,” said Dr Maurice Clarke of the Marine Institute. “This EMFF project has provided data confirming the critically endangered status of some species and provides up-to-date information for the development of fishery measures to eliminate by-catch.” 

Irish waters are also home to the Black Mouthed Catshark, Galeus melastomus, one of Ireland’s smallest shark species which can be found in the deep sea along the continental shelf. In 2018, Irish scientists discovered a very rare shark-nursery 200 nautical miles off the west coast by the Marine Institute’s ROV Holland 1 on a shelf sloping to 750 metres deep. 

There are two ways that sharks are born, either as live young or from egg casings. In the ‘case’ of Black Mouthed Catsharks, the nursery discovered in 2018, was notable by the abundance of egg casings or ‘mermaid’s purses’. Many sharks, rays and skate lay eggs, the cases of which often wash ashore. If you find an egg casing along the seashore, take a photo for Purse Search Ireland, a citizen science project focusing on monitoring the shark, ray and skate species around Ireland.

Another species also found by Irish scientists using the ROV Holland 1 in 2018 was a very rare type of dogfish, the Sail Fin Rough Shark, Oxynotus paradoxus. These sharks are named after their long fins which resemble the trailing sails of a boat, and live in the deep sea in waters up to 750m deep. Like all sharks, skates and rays, they have no bones. Their skeleton is composed of cartilage, much like what our noses and ears are made from! This material is much more flexible and lighter than bone which is perfect for these animals living without the weight of gravity.

Throughout history sharks have been portrayed as the monsters of the sea, a concept that science is continuously debunking. Basking sharks were named in 1765 as Cetorhinus maximus, roughly translated to the ‘big-nosed sea monster’. Basking sharks are filter feeders, often swimming with their mouths agape, they filter plankton from the water.

They are very slow moving and like to bask in the sun in shallow water and are often seen in Irish waters around Spring and early Summer. To help understand the migration of these animals to be better able to understand and conserve these species, the Irish Basking Shark Group have tagged and mapped their travels.

Remarkably, many sharks like the Angel Shark, Squatina squatina have the ability to sense electricity. They do this via small pores in their skin called the ‘Ampullae of Lorenzini’ which are able to detect the tiny electrical impulses of a fish breathing, moving or even its heartbeat from distances of over a kilometre! Angel sharks, often referred to as Monkfish have a distinctively angelic shape, with flattened, large fins appearing like the wings of an angel. They live on the seafloor in the coastal waters of Ireland and much like a cat are nocturnal, primarily active at night.

The intricate complexity of shark adaptations is particularly noticeable in the texture of their skin. Composed of miniscule, perfectly shaped overlapping scales, the skin of shark provides them with protection. Often shark scales have been compared to teeth due to their hard enamel structure. They are strong, but also due to their intricate shape, these scales reduce drag and allow water to glide past them so that the shark can swim more effortlessly and silently. This natural flawless design has been used as inspiration for new neoprene fabric designs to help swimmers glide through the water. Although all sharks have this feature, the Leafscale Gulper Shark, Centrophorus squamosus, found in Ireland are specifically named due to the ornate leaf-shape of their scales.