I was recently asked a question by sunbeam about ringnets and how they might be used to catch squid.
Here is the information I have gathered so far.
the best description of ringnetting i could find on the net was found here:
A brief account of the operation of ring-netting will be necessary if the more technical elements are to be grasped. Those readers who desire a deeper understanding of the method, I would direct to my The Ring-Net Fishermen. Ring-netting was essentially a two-boat operation, so skippers would pair off and take a neighbour, or "neebor". Some partnerships endured for decades, others for mere months. The crew that located a shoal, or "spot", of herring would set, or "shot", its net. The end of the net would then be picked up by the neighbouring crew and towed around to meet the net-boat. A circle, or "ring", was thus formed, hence the description ring-netting. The boats would then meet to close the ring, and the neighbouring crew would transfer aboard the net-boat to help haul in the net; and while the net was being hauled, the other boat would keep a strain on the net-boat, by means of a connecting rope, to prevent that boat from being pulled over the net and to preserve the shape of the net. Once the bottom, or "sole", of the net had been closed, the herring were trapped. When the net-hauling had been completed, only the bag, or "top sling", would remain, containing the catch, which would then be "dried up" alongside. The towing-boat would then cast off and come round to "square" the boats by also lashing on to the bag on its opposite side. With the net secure between the two boats, the removal of the catch from the net could begin, using a winch-operated bag-net called the "brailer".
I think you should try to get hold of the 2 books they mention -
Book 1 - "The ring-net fisherman"
by Angus Martin, Will Maclean (Illustrator) Product Details: ISBN: 0859764435 Format: Paperback, 263pp Pub. Date: October 1996 Publisher: Birlinn, Limited
This book traces the development of ring net fishing from the early nineteenth century to the present day. More than just a history of the fishing industry on the West Coast of Scotland the author provides a full picture of the life of the fisherman both ashore and afloat. The narrative is illustrated with anecdotes and reminisences collected by the author over the years.
Book 2 - The North Herring Fishing: Ring-net Fishermen in the Minches
by Angus Martin (Paperback - June 2001)
This is the oral history of forays to the Minches by fishermen of Ayrshire and Kintyre - to what they called the "north". It is presented through the men's memories and traditions as recorded and edited by historian Angus Martin. As such it contains intimate details of the skills, courage and humour of these sea-going hunters, rather than detailed descriptions of the techniques involved. However, the book does explore "appearances" or the fishermen's uncanny ability to interpret natural phenomena and to see, smell, hear and feel the very presence of the herring beneath the sea.
This book offers a record of the working lives of 20th century fishermen.
[both are available on amazon.com.]
Here is another book that might be of some help:
Book 3 - Herring Fishermen of Kintyre and Ayrshire
By Angus Martin, Format: Paperback Pub. Date: November 2002
This title explores more than 140 years of Scottish fishing history told through the fishermen's own memories and traditions. A companion volume to "The North Herring Fishing", it concentrates on the accounts of the earlier period when crews worked with oar and sail.
Such fisheries as Donegal and Dunmore East in Ireland, Isle of Man, Firth of Forth and Whitby are explored and the hardships and dangers of both drift-net and ring-net fishing recalled. More than 50 Kintyre and Ayrshire fishermen were interviewed to produce this tribute to a vanished way of life.
Hope this was of some help. Sorry I don't know of any ring netting videos.