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Dive Reports

26-12-2023 Rose Bay

DAY/DATE

Tuesday

26/12/2023

SITE/S

Rose Bay

Bowen

 

PARTICIPANTS

Julie & Terry

 

TYPE

Subtidal

 

MODE

Shore Entry

 

VESSEL

 

DIVE

1

 

SITE/S

Rose Bay

 

SPECIES #

9

 

DURATION

121 Min

 

DEPTH/RANGE

2-4.6 m

 

TEMP.

29 C

 

VIS.

5 m

 

SURGE

Slight

 

CURRENT

Nil

 

COMMENTS & OBSERVATIONS

Our first dive after moving here approximately 12 months ago was at Rose Bay, a site we have not dived since then. On that occasion we only found one species, Gymnodoris sp. 27. Another dive at the site seemed appropriate at this time.

We swam out along the northern headland where some of the Gymnodorids and Elysia were found. Then we swam in an easterly direction to the reef that runs part way across the bay. Substrate varied from poor to excellent coral cover with some patches of rubble and large areas of algae. We had to search hard for the species we found here. Visibility also dropped markedly on the eastern side of the reef. We headed back across the sandy bay and stopped to investigate a low rocky outcrop very close to the shore. The algae and seagrass in the area concealed numerous species including an abundance of Haloa sp. 02. On surfacing we could see the reason for the poor visibility out wider; the northerly breeze and tide change had brought with them a brown current line which stretched along the coast and across the entrance to the bay.

Taxonomic Diversity:
Five of the nine species sighted were nudibranchs, with 2 being dorids comprising 2 x phanerobranchs (non-retractile gill), 0 x porostome (suctorial feeder),  0 x cryptobranchs (retractable gill) and 3 were cladobranchs comprising 3 x aeolids, 0 x dendronotinid, 0 x arminid. 3 x sacoglossans and 1 x cephalaspidean (headshield slugs) complete the species count. If diet is considered none of the 9 species sighted were spongivores.

Our Historical data:
With only two dives at this site it is far too early to draw any conclusions about species prevalence and abundance, however it is interesting to note that, of the species recorded on this dive, the only species we had recorded previously in the Whitsundays was Elysia sp. 31. In addition, this is the first occasion on which we have recorded Elysia cf. hirasei, Herviella claror or Tenellia pinnifera in Australia.

Guide to Symbols:
+++ New Species
+ First time sighted in Whitsundays
# Most commonly sighted at this site with %

TOTAL SPECIES SIGHTED: 9

 

SPECIES LIST – ALPHABETICAL

Elysia cf. hirasei -4 +++
Elysia sp. 17 -2 +
Elysia sp. 31 -3
Facelina bourailli -2 +
Gymnodoris sp. 24 -2 +
Gymnodoris sp. 26 -5 +
Haloa sp. 02 -23 +
Herviella claror -2 +++
Tenellia pinnifera -4 +++

SPECIES GROUPED BY ORDER

Nudibranchia
Dorids
Phanerobranchs
Gymnodoris sp. 24 -2
Gymnodoris sp. 26 -5 
Cryptobranchs

Porostomes

Cladobranchs
Aeolids
Facelina bourailli -2
Herviella claror -2
Tenellia pinnifera -4
Arminids

Dendronotinids

Cephalaspidea
Haloa sp. 02 -23

Sacoglossa
Elysia cf. hirasei -4
Elysia sp. 17 -2
Elysia sp. 31 -3

Umbraculoidea

Pleurobranchoidea

Anaspidea

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