Merimbula Pelagic 21-22 May 2005

Observers

Dave Donnelly

Pete Constable

Kelly O'Sullivan

Chris Lekos

Bronwyn Dawes

Delwyn Dawes

Andrew Maxwell

Dave Burton

Tony Mitchell

Jo Denis

Jason Caruso

Deanne Jones

Fiona Stevens

Su Jewell

Leanne Maffesoni

Craig Dickman

Stephen Robey

Ms Robey

Phil Tubb

Lyn Wain

Jenny Robb

+ 21 others from the Marine Discovery Centre, Eden

 

Website produced by Simon Mustoe, AES Applied Ecology Solutions Pty. Ltd. 

 

On the weekend of May 21 and 22 the catamaran True Blue out of Merimbula, N.S.W was jointly chartered by myself (David Donnelly) and Jenny Robb of the Marine Discovery Centre, Eden for a wildlife trip to the continental shelf. Much interest was generated for this trip due to the aggregation of large numbers of Sperm Whales in the area over the preceeding weeks. Representatives from several state and federal government agencies including Department of Environment and Heritage, New South Wales Parks and Wildlife, Department of Sustainability and Environment and Parks Victoria were onboard. Also represented were Melbourne Aquarium, Zoos Victoria and ORRCA. Unfortunately no Sperm Whales were recorded during this weekend.

Cetacean sightings. Track lines are shown in blue (Saturday) and orange (Sunday)

Map from the CSIRO Marine website showing the 6 day average Sea Surface Temperature off SE Australia - the 200m contour is shown.

Highlights: Seven species of cetacean were sighted over the two days including a pod of Pygmy Killer Whales (a local speciality) and beaked whales. 

 

DAY 1 - 21 May 2005

Departed port at 7am, forecast was for a fine day with winds from the south west at 10-15 knots. Sea conditions started off with a 1-1.5m south easterly swell with slight wind disturbance on the surface. Sea conditions improved as the day progressed with the swell dropping steadily throughout the day and sea surface conditions becoming oily calm. Wind strength remained below 10 knots for the day. Water temperature ranged from 19 degrees celsius close to coast to 21 degrees celsius along the continental shelf. Bird life was present but not prolific with just hand full of species documented including Black Browed Albatross, Wandering Albatross (Juvenile) and Yellow Nose Albatross. As conditions improved, current lines became visible on the surface with many “by the wind sailors” noted. Fish appeared plentiful on the surface, the main species being Stripey Tuna, Frigett Mackerel and Sauries. One 4-5 ft Blue Shark was also recorded. Australian Fur Seals were recorded on and off throughout the day in groups of 1 -5 individuals. There were two highlights for this day the first an encounter with a large pod of Risso’s Dolphins associating with Oceanic Bottlenose Dolphins and another unconfirmed species possibly Melon Head or Pygmy Killer Whales. The next highlight was coming across a pod of around 25-30 Pygmy Killer Whales. Saturday ended with a magnificent sunset, no wind and a pod Common Dolphins on and around the bow.

 

[Click to enlarge] Pygmy  Killer Whale, Jason Caruso

[Click to enlarge] Pygmy Killer Whale, Phil Tubb

[Click to enlarge] Risso's Dolphin, Phil Tubb

[Click to enlarge] Yellow-nosed Albatross, Jason Caruso

[Click to enlarge] Shy Albatross, Jason Caruso

NOTE, ALL IMAGES ON THIS SITE ARE COPYRIGHT. 
DAY 2 - 22 May 2005

Departure again was at 7am, the forecast for the day was the same as the previous day. Sea conditions had improved overnight with almost no swell present but wind disturbance had increased with some minor white caps. The water conditions improved quickly on this day and oily calm conditions prevailed for the better part. Sea temperatures were as per the previous day. Our course for the day concentrated efforts just on and just inside the shelf as apposed to the previous day which found us extending our survey far beyond the drop off where sea life was less prolific. This course kept us around current lines that became visible just after lunch time. Many more birds and schools of fish were observed on this day suggesting that possibly productivity was greater inside the shelf area. Again there were two highlights on this day, the first being an encounter with two beaked whales. The two whales remained just below the surface around the boat with just their foot prints and pale coloration visible. At one stage the dorsal fins of both animals broke the surface but their heads remained submerged making it extremely difficult to make an accurate identification. The second highlight on this day was the sighting of a Minke/Humpback association. The two whales remained close to each other for the majority of the encounter with the two of them at times as close as less than 5 metres. Sunday again ended with a spectacular sunset and Common Dolphins.

Thanks to True Blue and our skipper Matto for a great two days on the water.

 

POSITION DATA
ID Latitude Longitude Species Number Date
1 -36.9167 150.2667 Risso's Dolphin 50 21/05/2005
2 -36.9167 150.2667 Oceanic Bottlenose Dolphins 5 21/05/2005
3 -36.9167 150.2667 Prob. Pygmy Killer Whale 3 21/05/2005
4 -36.85 150.3833 Minke Whales 2 21/05/2005
5 -36.85 150.3833 Beaked Whale 1 21/05/2005
6 -37.2 150.3333 Pygmy Killer Whale 27 21/05/2005
7 -37.0667 150.2833 Humpback Whale 1 21/05/2005
8 -36.95 150.0333 Common Dolphins 30 21/05/2005
9 -36.9 149.9833 Common Dolphins 25 22/05/2005
10 -36.9833 150.3167 Humpback Whale 2 22/05/2005
11 -37 150.3333 Minke Whale 1 22/05/2005
12 -37.1667 150.4167 Beaked Whale 2 22/05/2005
13 -36.9667 150.3333 Minke Whale 3 22/05/2005
14 -36.9667 150.3333 Humpback Whale 1 22/05/2005
15 -36.9333 150.1667 Common Dolphins 15 22/05/2005