Showing posts with label Risso's Dolphin. Show all posts
Showing posts with label Risso's Dolphin. Show all posts

13 May 2023

13 May 23 - A Day Trip To St Mary's With ORCA

This was my second Cetacean for ORCA in May 23. The previous week had seen me surveying from Roscoff back to Plymouth. This survey was going to stay within the UK with a day trip to the Isles of Scilly on the Scillonian III. The weather looked mild & sunny with light winds and hopefully calm seas. This turned out to be the case. I drove down in the early hours of the morning & fortunately, I didn't stop until the Long Rock McDonalds on the edge of Penzance. After some food, I planned to head into Penzance. But the car wouldn't start as I had a flat battery. I contacted the team leader for the survey, Mary to let her know & asked if she could pick me up. I knew She was staying near to the Hayle & would be coming right past me. Fortunately, she picked up my phone call & arrived about fifteen minutes later. We were soon parked up in Penzance. Ian, the third member of the team arrived before we needed to join the queue to board the Scillonian III.
The view from the bridge wing
We were allowed onto the bridge, once we were clear of Penzance Harbour. The Scillonian III has a small bridge and there isn't room for us to survey from inside the bridge. However, there is plenty of room on the bridge wings with a walkway in front of the bridge. We had been warned to wear warm & waterproof clothing as we would be exposed to the weather on the crossing. Fortunately, it stayed dry, however, thanks to the wind chill it was far from warm, despite the sun.
Gwennap Head & Porthgwarra Valley
Despite our best efforts, we drew a blank on Cetaceans on the crossing to St Mary's. The Bird highlights were: three Storm-petrels, thirty-three Manx Shearwaters, a few Gannets, some Razorbills & Guillemots and four Puffins. There were a couple of Seals around the Eastern Islands, but they were too far away to do anything other than record them as Seal sp., even though we suspected that Grey Seal was the more likely species. I was focusing on watching for Cetaceans and I didn't have time to do much photography, other than when I was the recorder. We carried on surveying until just before we could see Hugh Town.
The walkway in front of the bridge
Survey over & Mary is enjoying the view of St Mary's
The top end of St Mary's
Telegraph at the top end of St Mary's
We docked just before 12:00 and had about three & a half hours for a shore run. This allowed us to be back on the quay an hour before the Scillonian III's schedule departure to ensure there were no last minute problems getting aboard. We all split up to do different things. My plan started with a walk to Porthcressa Beach in the hope of being able to scan over to St Agnes and Gugh. At high tide, the beach between the two islands is flooded, but at low tide it is possible to walk across to Gugh from St Agnes. There was a Laughing Gull that was hanging around a Lesser Black-backed Gull colony on Gugh.
Porthcressa Bay
I've seen a couple of Laughing Gulls in the UK and many more abroad, so I wasn't fussed enough to jump on an inter-island boat over to St Agnes to try to see it. Plan B was to see if I could see it from Porthcressa Beach. The answer was no: I hadn't bothered taking the telescope with me, but there was too much heat haze anyway. I spoke to a local Birder who did have a scope, but he said the Laughing Gull often dropped into the colony & disappeared out of sight & he hadn't seen it since he had started looking before I arrived.
Porthcressa Bay
Looking into Porthcressa Bay from Peninnis
I wasn't too fussed about hanging around & carried on, over Peninnis Head to look around the Old Town Church & Lower Moors, followed by walking around Porthloo Lane. These are some of my favourite parts of St Mary's. Not surprisingly, there weren't any migrants, but it was good to have a gentle walk around some of my old October haunts from the past.
Moorhen: Chick. Lower Moors, St Mary's
Song Thrush: They are always a favourite for visiting Birders as they are much tamer than elsewhere in the UK
Porthloo Beach
The Scillonian III: A sight that will be familiar to all the Birders who have visited St Mary's
Finally, I ended up back in a Hugh Town cafe to top up the caffeine levels before heading back with plenty of time to meet Mary & Ian on the quayside.
Hugh Town harbour
The inter-island boats return in time to connect with the Scillonian III's departure
We sailed on time and it was a better crossing.
Gugh: This photo was taken from the Scillonian III & Gugh was a fair bit closer that from Porthcressa Bay. But trying to pick out the Laughing Gull would still have been a challenge
My personal highlight on the return crossing, was finding a pod of three Risso's Dolphins heading straight for the Scillonian III, before passing down the port side. Frustratingly, I didn't manage to get any photos. When surveying, the initial priority is to note the vertical distance of the Cetacean from the horizon when it is first seen. We use binoculars which have a vertical graduated marking in the left eyepiece which allows that to be measured. Next you have to measure the angle from 12 o'clock (i.e. the direction the ferry is travelling) to the Cetacean.

These two measurements are useful as they allow the ORCA head office computer to calculate the distance from the ferry to the Cetacean. The maths also needs to know the height of the bridge above sea level (which is a known height for each ferry). The ships heading, speed, position, time, sea state, weather & visibility are also included in the calculations. Finally, the direction of travel and what the Cetacean is doing is also noted. All this information helps the ORCA head office computer to provide an estimate of the number of Cetaceans seen along each of the survey routes and ultimately the population numbers along each ferry route.
Risso's Dolphin: These Risso's Dolphins were photographed from the Plancius on the West African Pelagic between Cape Verde and the Canaries (3 May 18).
Once these measurements have been determined, the next thing is to identify the Cetacean involved. But I had already done that on the first sighting based upon their colouration, size & high dorsal fin. Finally, I could lift the camera to try & get a photo. But I hadn't seen them till they were fairly close, we were closing rapidly on each other and they weren't spending a lot of time on the surface. Think that's enough excuses for the lack of photos. They were only my second UK sighting, although I've also seen then on the Atlantic Odyssey, the West African Pelagic and Banda Sea Cruise.
Manx Shearwater: I saw thirty-three on the crossing to St Mary's and just under three hundred on the return journey
Half an hour later, Ian picked up a very close Minke Whale, but I was the recorder & had to head straight into the bridge to note the time, location, course & speed. Once I had noted them, it had already detected our presence & dived for good. C'est la vie. There were more Manx Shearwaters and a few each of Fulmars, Gannets, Razorbills and Guillemots. But no more Storm-petrels or Puffins. Eventually, we reached Mousehole, before starting the turn into Penzance Bay.
The Wolf Rock Lighthouse off the Cornish coast
Mousehole
St Michaels Mount in Penzance Bay
The second survey of the day was over and to get a relatively calm crossing on the Scillonian III is always a big bonus. It had been a lot of fun & I'm hoping I get selected for another Scillies survey.
Rock Pipit: This Rock Pipit greeted our return from the seawall of Penzance Harbour, while we were waiting to disembark
Fortunately, we managed to jump start the car when Mary dropped me back at it. It was then a straight-forward drive home in one go. I managed to bump start it on the Monday & got the car into the garage. They confirmed that the problem was an end-of-life battery and not anything more serious or expensive like a dying alternator. A new battery & I was back on the road again.

31 Oct 2022

31 Oct 22 - Indonesia - Banda Sea Cruise Day 5 - Cetaceans On The Crossing From The Tanimbar Islands To The Babar Islands

This is the third Blog Post detailing the Cetaceans we saw on the crossing from the Tanimbar Islands to Babar Island. The previous two Blog Posts covered the Seabirds & an Olive Ridley Turtle. A final Blog Post will cover the Flying Fish.

Regular readers of the Blog will know that I'm a big fan of Cetaceans and I was looking forward to the Banda Sea Cruise as I was expecting to see a variety of species at regular intervals: I was not disappointed.

I will start with Risso's Dolphins which are relatively easy to identify with their pale grey and generally scarred colouration and high, narrow and strongly falcated dorsal fin. They have a very wide range in all the oceans, except for the cold Arctic and Antarctic oceans.
Risso's Dolphin: The pale grey colouration & scarring on the body allow this Dolphin to be identified as a Risso's Dolphin. It was seen at 10:52 local time
Risso's Dolphin: Another photo of the previous individual showing the classic Risso's Dolphin's thin & high-curved dorsal fin
Risso's Dolphin: This is a different individual that we saw earlier in the morning at 09:46 local time. This was a Risso's Dolphin based upon the pale grey body & the scarring
[Note - After I wrote this Blog Post, James Eaton came back to query my identification of the next Dolphins, which I had stated I thought they were Indo-Pacific Bottlenose Dolphins & James stated "Your Indo-Pacific Bottlenose Dolphins photo - are you sure as to the identification, the beak looks so long and slender that it appears more like a Spinner to me? Remember, Spinners in Indonesia aren’t so long-beaked. It also looks very dark, though it could be the lighting". There was also feedback from Dan Brown stating "To me the IndoP BNDs are Spinners. The beak looks way to slim for BND, the colouration is also pro Spinner and the dorsal is pretty typical in shape for Spinner as well. Other IDs all look good". As a result of this feedback, I've corrected the identification of these Dolphins to Spinner Dolphins].
Spinner Dolphin
Spinner Dolphin
Spinner Dolphin: Four of a party of five Spinner Dolphins that we saw at 07:30 local time
Spinner Dolphin
At 11:16 local time we encountered a logging Cetacean. I've a number of photos of it looking exactly the same as the second photo, followed by the last two photos where it turned before diving.
[Note - At the time I wrote this Blog Post, I said this was a probable Dwarf Sperm Whale. Having looked at the Post again today, I'm struggling to see why I was so cautious. Looked at it again, I'm now confident this logging Cetacean is a Dwarf Sperm Whale. There was also positive feedback from James Eaton "Dwarf Sperm - agree. Looks the same as one I encountered in 2018 off Babar. That was also logging, classic behaviour" & from Dan Brown stating "Other IDs all look good". I've removed the probable labelling].
Dwarf Sperm Whale: The initial view
Dwarf Sperm Whale: To me this looks like the classic profile for a Dwarf Sperm Whale
Dwarf Sperm Whale: Another photo of it logging
Dwarf Sperm Whale: It came up for another view as we started to pass it
Dwarf Sperm Whale: A final view of the dorsal fin & it was gone

28 Dec 2018

28 Dec 18 - Index To My Atlantic Dolphins Photos

This Blog Post is an Index to all the Blog Posts covering my Dolphin sightings. The following Blog Posts cover all my Rorqual Whale, Baleen Whale, Sperm Whale, Beaked Whale, Beluga Whale & Narwhal, Blackfish, Atlantic Dolphin, Pacific Dolphin and Porpoise Posts. The taxonomy follows the Marine Mammals of the World (Second Edition) book. There are links to the Posts against each entry below. Alternatively, you can click on a particular species in the Keywords section on the right side of the Blog to show all Posts for the selected species. Finally, selecting the Cetaceans Keyword to show all Cetacean Posts. I will continue to add to the photos and links as I write new Cetacean Blogs.
Risso's Dolphin: Torpoint, Cornwall, UK (15 June 18)
Bottlenose Dolphin: Captive individual at the Eilat Sealife Centre, Israel (9 Apr 14)
Bottlenose Dolphin: Crossing to Bardsey, North Wales (18 Jun 15)
Bottlenose Dolphin: Ascension Island (24 Apr 18)
Bottlenose Dolphin: At sea between Ascension Island and Cape Verde (29 Apr 18)
Bottlenose Dolphin: At sea between Cape Verde and the Canary Islands (3 May 18)
Pantropical Spotted Dolphin: St Helena (18 Apr 18)
Pantropical Spotted Dolphin: A large pod at sea between Ascension Island and Cape Verde (28 Apr 18)
Atlantic Spotted Dolphin: Leaving Cape Verde (1 May 18)
Atlantic Spotted Dolphin: At sea between Cape Verde and the Canary Islands (3 May 18)
Atlantic Spotted Dolphin: At sea off the Canary Islands (4 May 18)
Spinner Dolphin: A large pod at sea between Ascension Island and Cape Verde (27 Apr 18)
Clymene Dolphin: At sea between St Helena and Ascension Island (21 Apr 18)
Clymene Dolphin: Close acrobatics from a Clymene Dolphin between Ascension Island and Cape Verde (28 Apr 18)
Striped Dolphin: A pod at sea between St Helena and Ascension Island (22 Apr 18)
Striped Dolphin: At sea between Cape Verde and the Canary Islands (2 May 18)
Striped Dolphin: At sea off the Canary Islands (4 May 18)
Striped Dolphin: At sea between Madeira and Portugal (6 May 18)
Striped Dolphin: At sea off Portugal (7 May 18)
Striped Dolphin: In Southern Biscay from the Brittany Ferry (15 Aug 18)
Short-beaked Common Dolphin: Crossing Lochmaddy to Uig, UK (17 Oct 15)
Short-beaked Common Dolphin: At sea off Tristan da Cunha (13 Apr 18)
Short-beaked Common Dolphin: Bay of Biscay (9 May 18)
Short-beaked Common Dolphin: Off St David's Head (6 July 18)
Short-beaked Common Dolphin: Mother & youngster in Northern Biscay from the Brittany Ferry (15 Aug 18)
Short-beaked Common Dolphin: Southern Biscay from the Brittany Ferry (15 Aug 18)
Southern Rightwhale Dolphin: At the Estancia Harberton museum, Argentina (27 Mar 18)
Commerson's Dolphin: At the Estancia Harberton museum, Argentina (27 Mar 18)