Dive Report

13-06-2021 Nudi 2 & C Spot

Jun 13, 2021

DAY/DATE

Sunday

13/06/2021

SITE/S

Nudi 2 & C Spot

 

PARTICIPANTS

Terry, David

 

TYPE

Subtidal

 

MODE

Boat Dives

 

VESSEL

Rebel II

 

DIVE

1

2

 

SITE/S

Nudi 2

C Spot

 

SPECIES #

13

12

 

DURATION

71 Min

76 Min

 

DEPTH/RANGE

14 – 17 m

18 – 20 m

 

TEMP.

19 C

20 C

 

VIS.

3 m

8 m

 

SURGE

Mod

Light

 

CURRENT

Nil

Nil

 

COMMENTS & OBSERVATIONS

Surface conditions continued to be conducive to boating activities. The ramp at the Power Boat Club is still undergoing reconstruction so we put the boat in at one of the small ramps further up the passage, just past the jetty. The swell was up a little more than we anticipated but the crossing of the bar proved uneventful. Journeying north to Nudi 2 we could see the swell heaping up as it passed over the reef. The visibility at Nudi 2 was most disappointing and combined with the surge certainly reduced the species count. We headed further offshore, out to C Spot, for our second dive where we found cleaner water and a little less surge with the deeper water. These differences made for quite an enjoyable dive in comparison. C Spot is noted for producing Tambja and Nembrotha species and true to form a Tambja morosa was sighted. A white colour form of what could prove be Aegires citrinus but also with a black markings was sighted. We have decided to separate it for now as Aegires sp. 01. A problem with his camera battery saw Terry resurface to replace it causing him to miss half of this second dive.

Taxonomic Diversity:
17 out of the 24 species sighted (more than two thirds) were dorids comprising 3 x phanerobranchs, 4 x porostomes (all belonging to Phyllidiidae) and 10 x cryptobranchs (all belonging to the Chromodorididae Family). The other 7 species comprised mostly cladobranchs: 3 x aeolids, 2 x dendronotids and 1 x arminid with 1 x cephalaspidean completing the count. Although the species count is lower, the ratio of dorids to total is the same as our last trip, to Nudi Ledge, and the number of cryptobranchs, all belonging to the Chromodorididae Family as well, is also the same. On this trip it is worth noting that only one species was recorded at both sites, an unusual occurrence.

Our Historical Data:
Nudi 2:
– This survey is number 20 at this site since we first recorded information on 09/09/2012
– Last surveyed on 13/03/2021
– 99 species have been recorded here

C Spot:
– This survey is number 14 at this site since we first recorded information on 13/02/2011
– 46 species have been recorded here
– This is the first time we have recorded Dermatobranchus oculus and Goniobranchus coi at this site.

Key to symbols
+++ New Species
+ First time sighted at this site
# Most commonly sighted at this site with %

Total Species Sighted: 24

SPECIES LIST – ALPHABETICAL

Aegires sp. 01 -/1 +++
Bornella anguilla 3/-
Cadlinella ornatissima -/1
Chromodoris elisabethina 1/-
Chromodoris kuiteri1/- #70% 1st Dive
Dermatobranchus oculus -/1 +
Doriprismatica atromarginata 9/- #80% 1st Dive
Flabellina rubrolineata -/2 #64% 2nd Dive
Glossodoris rufomarginata 2/-
Glossodoris vespa -/1 #64% 2nd Dive
Goniobranchus coi -/1 +
Goniobranchus splendidus 2/1
Goniobranchus sp. 06 -/2
Hypselodoris jacksoni 2/-
Phyllidia ocellata -/1 #71% 2nd Dive
Phyllidia picta 2/-
Phyllidia varicosa 1/-
Phyllidiella pustulosa 4/- #80% 1st Dive
Pteraeolidia semperi 1/-
Roboastra luteolineata -/3
Sagaminopteron ornatum 1/- #75% 1st Dive
Samla bicolor -/1
Tambja morosa -/1
Tritoniopsis elegans 1/-

SPECIES GROUPED BY ORDER

Nudibranchia
Aegires sp. 01 -/1 
Bornella anguilla 3/-
Cadlinella ornatissima -/1
Chromodoris elisabethina 1/-
Chromodoris kuiteri1/- #70%
Dermatobranchus oculus -/1 
Doriprismatica atromarginata 9/- 
Flabellina rubrolineata -/2 
Glossodoris rufomarginata 2/-
Glossodoris vespa -/1 
Goniobranchus coi -/1 
Goniobranchus splendidus 2/1
Goniobranchus sp. 06 -/2
Hypselodoris jacksoni 2/-
Phyllidia ocellata -/1 
Phyllidia picta 2/-
Phyllidia varicosa 1/-
Phyllidiella pustulosa 4/- 
Pteraeolidia semperi 1/-
Roboastra luteolineata -/3
Samla bicolor -/1
Tambja morosa -/1
Tritoniopsis elegans 1/-

Cephalaspidea
Sagaminopteron ornatum 1/- 

Sacoglossa

Umbraculoidea

Pleurobranchoidea

Anaspidea

Pteropoda

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