Octopuses & other Cephalopods 

Cephalopoda contains the nautiluses; cuttlefishes, squids, and octopuses.

1)  They are the most advanced of all the invertebrates.
2)  They move by jet propulsion, squirting water from a funnel.
3)  They are the most intelligent of the invertebrates, with a capacity for learning.
4)  Most of them are able to eject ink to confuse predators.
5)  Most of them have a remarkable ability to change colour.
6)  They have arms with suckers which they use to capture prey. (Octopuses have eight arms, squids have ten).
7)  They have a hard beak to tackle prey with hard shells like crabs.
8)  Their heyday was 100 million years ago in Cretaceous times when Ammonites were plentiful in the oceans of Earth.
9)  Although they are molluscs, most of them have evolved to have only a diminished internal shell (the cuttlebone of the cuttlefish), or have lost their shell completely (octopus).
10) The Giant Squid, Architeuthis, is the largest invertebrate known, and stretched out with its tentacles included, it has attained 18 metres in length. Even larger specimens may await to be discovered in the deepest oceans.
 

Curled Octopus, Eledone cirrhosa

5 December 2009
A Common Octopus, Octopus vulgaris, was washed up dead on Salthouse Beach, North Norfolk after a week of strong northerly winds and quite rough seas, resulting in a variety of finds along the shoreline. The octopus was found by local diver Rowley Nurse whilst walking his dog along the shore.

9 July 2009
Commercial crab and lobster fisherman Clive Brown brought me a live Common Octopus, Octopus vulgaris, which he landed in one of his pots to the north-west of Les Hanois Lighthouse , south-west of Guernsey, Channel Islands, at 10:00 am. This octopus was missing one arm. The injury had healed.
 

All reports of Octopus vulgaris in Channel Island waters are of interest because of their virtual disappearance after the cold winter of 1962/ 1963. They began to re-appear in small numbers several years ago and then disappeared again. Clive Brown reports one being caught in the same location as his capture by another fisherman five years ago. They may move in from deeper water to the west of Guernsey.
Octopus vulgaris has two rows of suckers per arm and grows to a much larger size than Eledone cirrhosa, which has one row of suckers per arm.
 

5 June 2009
Commercial fisherman Rick Ferbrache caught a Common Octopus, Octopus vulgaris, one mile off the Rousse headland, off the north-west coast of Guernsey.

All reports of Octopus vulgaris in Channel Island waters are of interest because of their virtual disappearance after the cold winter of 1962/ 1963.  They began to re-appear in small numbers several years ago and then disappeared again.  Clive Brown reports one being caught in the same location as his capture by another fisherman five years ago.  They may move in from deeper water to the west of Guernsey.
Octopus vulgaris has two rows of suckers per arm and grows to a much larger size than Eledone cirrhosa, which has one row of suckers per arm.

1 March 2009
An unusual octopus was captured in a shallow water net off Brittany, France, by Nick Praed on the "Silver Dawn" fishing out of Newlyn, Cornwall.
 

Richard Young from Hawaii suggested Haliphron atlanticus.

Yes, I concur with Dick that that looks like a Haliphron.  It's pretty shallow for a Haliphron.  Normally they hang out somewhere between 200 and 2000 metres (not that we have huge amounts of data for them).  There are quite a few records for western Atlantic and fewer for eastern Atlantic but I think that's probably a reflection of research effort rather than anything else.  There was quite a large one caught of the west of Ireland last year.  The females grow very large (see: http://news.bbc.co.uk/1/hi/sci/tech/1898313.stm for a huge specimen caught off New Zealand) and the Irish one was a relatively big one and made the local press.  I tried to find the web page for you by googling but unfortunately I can't find it.
There's a bit of info on the occurrence of this species further north:
Collins, M.A., Brown, E. & Pierce, G.J., 1995. The octopus Haliphron atlanticus Steenstrup in Shetland waters. Shetland Naturalist, 1, 123-124.
They're interesting little things and not a whole lot is known about them.  Males are very small: your specimen may well be a male.  You can tell by the arms.  Like other cephalopods they have a modified third arm in the male for delivering sperm, but in Haliphron it's kept in a little sac under the eye, so males look like they've only got 7 arms, instead of the regulation 8.  It's this character that is one of the reasons we know it's related to other weird cephalopods such as Agonauta (also known as the Paper Nautilus), Ocythoe and Tremoctopus (the blanket octopus).
Dr Louise Allcock
Co-editor, Journal of Natural History
Adjunct Lecturer, Martin Ryan Marine Science Institute, Galway
Honorary Senior Lecturer, Queen's University Belfast
+353 (0)91 495868

3 Match 2008
A hexapus, or six-legged version of the Lesser or Curled Octopus, Eledone cirrhosa, was captured in a lobster pot off the coast of north Wales and put on show at the Anglesey Sea Zoo. It was only then it was discovered to have only six legs instead of the normal eight, and this may have a result of a birth defect rather than an accident. It was been claimed as a world's first as nobody seems to discovered one before. Its fame meant it was transferred to the Blackpool Sea Life Centre to attract a bigger audience.

In Saundersfoot, south Wales we found a Lesser or Curled Octopus, Eledone cirrhosa. It was very much alive and although stranded by the receding tide, when placed in a nearby deep rock pool where it became quite active, changing colour.

21 March 2002
About twenty dead Lesser Octopuses, Eledone cirrhosa, were scattered over a stretch of about 200 metres of  Killiney beach, Co. Kerry, Ireland. The tentacles/arms were about 15 cm long.

17 November 2001
A Curled Octopus was discovered by Helen Nott on Heacham Beach, Norfolk, In this clear photograph, you can see the single row of suckers. The Common Octopus has a double row.

15 October 2000
A Curled Octopus over 1 kg in weight was caught off Roker Pier, near Sunderland, NE England.

15 May 1999
 Dr Peter Tannett discovered the photographed Curled Octopus whilst on a field meeting with the Yorkshire Naturalists' Union on rocks just above low water at Ravenscar, North-east Yorkshire on Saturday 15 May 1999.

 
                                          Common Octopus
                                         Photograph  ©  by Richard Lord (Guernsey)

Three Common Octopuses were also reported from Cornwall during the first weeks of November 2002.

4 October 2002
A Guernsey fisherman caught a large Common Octopus, Octopus vulgaris, in a crab pot about half a mile from Hanois Lighthouse off the south-western tip of Guernsey.  The octopus had devoured at least two edible crabs and one lobster.  The fisherman estimated the total length at about 1.5 metres and the tentacle length at 1 metre.  He estimated the weight at 4.5 to 5.5 kg (10 to 12 lb).  He returned the octopus to the sea.
Another Guernsey fisherman caught a large Octopus vulgaris in July 2002.
Sea surface temperatures at the entrance to St. Peter Port harbour, Guernsey have been about 1.5° C warmer since early August than the average sea surface temperature for the last 20 years.  The sea at the entrance to St. Peter Port harbour has been warmer in every week this year than the average temperature for the past twenty years. The highest sea temperaure occurred on 2 October 2002 at 17.8° C compared to the mean of 16.7° C.

13 August 2002
One large Octopus vulgaris was caught south of Plymouth and landed on the Plymouth Fish Market.
 

May 2002
A Common Octopus, Octopus vulgaris, was caught three quarters of a mile at Chapel Point off Mevagissey, Cornwall, and presented to Mevagissey Harbour Marine Aquarium.

25 March 2002
A Common Octopus, Octopus vulgaris, in Plymouth Fish Market. This one was not notified, so maybe they are getting commoner in the seas off the south-west?

31 October 2001
Fisherman Steve Long caught a Common Octopus, Octopus vulgaris, off the Cornish coast off Coverack in deepish water at about 75 metres (40 fathoms). This warm water octopus is now only rarely discovered in the English Channel, although within just about living memory it was commoner. This species was identified by Paul Gainey and it will go to the Blue Reef Aquarium in Newquay.

October 1998
 

                             A large Common Octopus, Octopus vulgaris, was brought into Plymouth Aquarium. It
                             was believed to have been caught off the extreme south-west of Cornwall. The
                             Common Octopus has been rare in British seas for nearly 40 years, apparently since the
                             cold winter of 1963.
                             The Looe boats also brought in a Squid measuring over 2 metres from the beak to the
                             tail, excluding the tentacles. The species was not identified. (Jon Makeham Report).
 

25 June 1999
A Common Octopus, Octopus vulgaris, was seen by a diver off off Dodman, Cornwall (SX 0039). It was a metre across. Common Octopuses are only rarely discovered even off the south-western coasts. However, in the past, before the cold winter of 1963, they may have been commoner.

On February 2, 1999 I picked up a specimen of Octopus vulgaris from a local crab fisherman who was potting a few miles south-east of Guernsey. The octopus weighed 4051 grams but Right arm III and IV were missing part of their length and Left arm I, II, III, & IV were missing part or all of their length.  Total length of octopus to tip of right arm I was 129 cm.

These are the only two Octopus vulgaris I have come across during my 6 years in Guernsey although there may have been a couple of other local captures.

Wikipedia Octopus vulgaris

Octopus species

Squid Eggs masses (Sussex coast)
Cornish Marine Wildlife Reports 1999 (by Ray Dennis)
Cornish Marine Wildlife Reports 2000 (by Ray Dennis)
Cornish Marine Wildlife Reports  2001 (by Ray Dennis)

3 January 2002
A deep water trawler after Blue Ling and Hake etc. caught a female Giant Squid, Architeuthis dux, amongst the large haul of fish. With a mantle length of 127 cm it is a medium-sized specimen with some of the tentacles missing. Therefore, the total length could not be measured, but it is estimated to be about 5.5 metres with a weight of about 60 kg. the specimen will be prepared for display at the National Marine Aquarium, Plymouth, ‘Creatures of the Deep' zone from May 2002.
This is believed to be the 25th Architeuthis recorded in British waters since 1673.  Fifteen have been stranded on the shores of the British Isles, nine caught in fishing gear and one found in the stomach of a Sperm Whale.

There have been nineteen species of Architeuthis described but it is unlikely that there are more than seven, and most recent work suggests that there are three species - Architeuthis dux in the north Atlantic, Architeuthis martensi or japonica in the northern Pacific and Architeuthis sanctipauli in the Southern Ocean.  However DNA studies have so far been carried out on only two specimens, one from New Zealand and one from Newfoundland (Atlantic coast of Canada), and the results so far published show no significant differences between them.

According to the Guinness Book of Records 1991, the largest squid found in British seas was an Architeuthis monachus found at the head of Whalefirth Voe, Shetland Isles on 2 October 1959. Its total length was measured at 7.31 metres (24 ft).

However, details of this record may be called into question as it is included in the List of British & Irish Strandings in year 1949 with a mantle length of 1.2 metres.
On this list the largest measured specimen had a mantle length of 1.75 metres and was stranded in Cove Bay, Aberdeen on 8 January 1984. (My estimate of the total length would be nearer 6.7 metres or 22 ft.)

The world's largest species is Architeuthis dux.

Molluscs Page

Architeuthis: News Report
Architeuthis: the Giant Squid
CephBase
Full Report (Aberdeen University)
EuroSquid