Marine Institute
SeaRover Dive Video

D674 Transect 27 Sea pen fields on moderate muddy slope interspersed with steep soft sediment hosting ophiuroids. P1. Water depth: 1097-806m. Feature: Slope

Highlights: Sea pen field, dense Kophobelemnon Close-up of Kophobelemnon Close-up of Kophobelemnon & anemones Sea pen field with Umbellula Squid Anemone - Pachycerianthus Compass anemone Litter Cerianthid anemone?

Of note: Large bed of the sea pen Kophobelemnon.

The sediment is soft and characterised by a large bed of the sea pen Kophobelemnon sp. with anemones and burrows. Up a steep slope the substrate is coarser and appears like relict coral overlain with sediment. Over the steep cliff the sediment is once again soft with a Kophobelemnon sp. field. Among these sea pens are anemones including cerianthids and burrows. Squid are common and fish species include eels, Lepidion and an occasional grenadier.

START VIDEO [00:00:00]/07:51. Sea pen fields on moderate muddy slope interspersed with steep soft sediment hosting ophiuroids. [00:00:00] ROV stops for sampling two push cores. It continues to grab images of Metallogorgia, Iridogorgia or Cirrhipathes. The ROV arm is ready to collect the spiral specimen and the ROV team resigns the sampling. [00:00:05] [1] The dive starts on a sea pen field (Kophobelemnon stelliferum) on muddy slope. [00:13:00] [2] The slope is 45 degrees inclined (left to right) with soft sediment hosting white ophiuroids living in small burrows. The ROV follows the bathymetry going uphill. [00:33:00] The slope is very steep now, nearly soft sediment vertical wall. [00:36:00] [3] Here sea pen fields start again on muddy slope. Other associated species are Umbellula sp. and Sagartiidae sp. 3. [00:43:00] ROV stops for imagery of sea pens. [00:55:00] Mud cloud/Vision obscured. [00:56:00] ROV stops for imagery of sea pens (possibly K. stelliferum) and Sagartiidae sp. 3. [01:15:00] Rubbish. [01:18:00] Mud cloud/ Vision obscured. [01:18:00] [4] Here steep muddy slope with frequent Sagartidae sp. 3 and K. stelliferum. [01:35:00] ROV stops for imagery of Corymorphidae sp. [01:39:00] ROV stops for imagery of Pachycerianthus multiplicatus. [01:56:00] Vision obscured/mud cloud. END VIDEO [02:03:00]/09:49.

Progression Start Duration Code Name
1[00:00:00]00:13:01M.AtMB.Mu.SpnMegSea pens and burrowing megafauna on Atlantic mid bathyal mud
2[00:13:02]00:24:09M.AtMB.Mu.BurOphBurrowing ophiuroid community on Atlantic mid bathyal mud
3[00:37:12]00:41:40M.AtMB.Mu.SpnMegSea pens and burrowing megafauna on Atlantic mid bathyal mud
4[01:18:53]00:44:37M.AtMB.Mu.BurAneBurrowing anemone field in Atlantic mid bathyal mud

Cnidaria
Cerianthidae sp. 1 : 2 : R
Pachycerianthus multiplicatus : 458 : C
Actiniaria sp. 1 : 4 : R
Actiniaria sp. 20 : 605 : R
cf. Halcampoididae sp. : 984 : R
Sagartidae sp. (wide oral disc) : 1118 : R
Actiniidae sp. (sand Bolocera) : 41 : R
Actinoscyphiidae sp. 1 (pink) : 1047 : R
Epizoanthus sp. 1 (Paguridae associated) : 317 : R
Metallogorgia/Iridogorgia or Cirripathes : 994 : R
Radicipes cf. gracilis : 1044 : R
Acanella arbuscula : 585 : R
Pennatulacea sp. 3 (submerged axis) : 1191 : R
Kophobelemnon stelliferum : 442 : A
Umbellula sp. : 581 : O
Corymorpha sp. 2 : 1204 : R

Arthropoda
Munida tenuimana : 339 : R
Paguridae sp. : 205 : R
Caridea (indet.) : 1077 : R
Bathynectes sp. : 235 : R
Mollusca
Graneledone sp. 1 : 937 : R
Teuthida sp. 1 : 1017 : R
Hypsogastropoda sp. : 621 : R
Echinodermata
Crinoidea sp. 1 : 131 : R
Ophiomusa lymani : 551 : A
Ophiuroidea sp. 10 : 640 : R
Zoroaster fulgens : 988 : R
Pseudarchaster sp. 1 : 433 : R
Hygrosoma sp. : 1125 : R
Parastichopus tremulus : 266 : R

Chordata
Deania calcea : 1139 : R
Trachyrincus sp. : 446 : R
Lepidion eques : 249 : R
Phycis blennoides : 1020 : R
Polyacanthonotus rissoanus : 552 : R
Notacanthiformes sp. 1 : 1012 : R
cf. Rouleina attrita : 1074 : R
Trichiuridae sp. : 1303 : R
Zoarcidae sp. 1 : 259 : R

Number of species = 39

© Marine Institute, MERC Consultants, Bernard Picton 2022