Dive Report

26-08-2021 Canyons?

Aug 26, 2021

DAY/DATE

Thursday

26/08/2021

SITE/S

Canyons?

 

PARTICIPANTS

Terry, David

 

TYPE

Subtidal

 

MODE

Boat Dives

 

VESSEL

Rebel II

 

DIVE

1

 

SITE/S

Canyons?

 

SPECIES #

9

 

DURATION

65 Min

 

DEPTH/RANGE

17 – 19 m

 

TEMP.

20C

 

VIS.

15 m

 

SURGE

Nil

 

CURRENT

Nil

 

COMMENTS & OBSERVATIONS

The trip commenced out of the Mooloolah River with high hopes. We had decided to investigate a site near The Trench on the Inner Gneerings called Canyons for which we had GPS coordinates but had never dived before. On arriving at the site the sounder was indicating that the depth averaged 18 m. Undeterred and in the hope of locating the so called “Canyons” we headed down the anchor line. At the bottom we were greeting with sparse and flat terrain in all directions. In an attempt to “make lemonade out of lemons”  we searched closely what little substrate growth was present on a couple of very low ledges and small boulders. David’s drysuit sprang a leak in the left wrist that, over the hour of immersion, percolated throughout the entire interior of the drysuit. The number of species sighted, as expected, was quite low. Phyllidia  cf. elegans was sighted being an almost perfect match to the example on our website. The two Goniobranchus sp. 06 were of remarkable size, at 100 mm, given the paucity of visible food. David called it a day after the dive, impatient to get out of his saturated undergarments. Once the anchor was weighed we cruised over the vicinity looking for a shallower region on the sounder, taking a mark at one spot for further investigation at a later date.

Taxonomic Diversity:
8 of the 9 species sighted were dorids comprising 1 x phanerobranch, 1 x porostome and 4 x cryptobranchs (all belonging to Chromodorididae). The other 3 species comprised 1 x aeolid, 1 x arminid and 1 x sacoglossan. If diet is considered then 5 of the 9 species sighted are spongivores.

Our Historical Data:
– This excursion is the first recorded survey at this site and may remain the only one.

TOTAL SPECIES SIGHTED: 9

 

SPECIES LIST – ALPHABETICAL

Dermatobranchus sp. 07 -1
Flabellina lotos -1
Goniobranchus sp. 06 -2
Goniobranchus splendidus -3
Hypselodoris jacksoni -3
Hypselodoris obscura -3
Phyllidia  cf. elegans -1
Roboastra luteolineata -2
Thuridilla cf. splendens -1

SPECIES GROUPED BY ORDER

Nudibranchia
Dermatobranchus sp. 07 -1
Flabellina lotos -1
Goniobranchus sp. 06 -2
Goniobranchus splendidus -3
Hypselodoris jacksoni -3
Hypselodoris obscura -3
Phyllidia  cf. elegans -1
Roboastra luteolineata -2

Cephalaspidea

Sacoglossa
Thuridilla cf. splendens -1

Umbraculoidea

Pleurobranchoidea

Anaspidea

DIVE IMAGES GALLERY

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