Marine Institute
SeaRover Dive Video

D527 Transect RB03 Mix of dense Lophelia/Madrepora reefs and colonies on slope and vertical wall. Non Priority. Features: Escarpment. Water depth: -872 m. TL: 1.5km. SOL: 13° 53.426' W 56° 37.174' N

Highlights: Anglerfish - Lophius piscatorius ROV collects Madrepora

Hard sea bed with scattered rocks, boulders which became vertical at points with exposed bedrock and escarpments. Lophelia and Madrepora are abundant in extensive coral rubble fields. Common species include rabbit fish, eels, cerianthids, holothurians, googly eyed cod and echiurans. Echiurans are numerous on carbonate outcrops. The fly trap anemone, Phelliactis hertwigi, the spiny scorpion fish and lamellate sponge occur. The holothurian, cf. Laetmogone, are numerous on the featureless sediment, small white urchins and cerianthids are also present. Towards the end of the dive there are areas of carbonate outcrops and rough ground interspersed with soft featureless sand with many small eels and numerous chimeras.

START VIDEO [00:00:00]. ROV stops for sampling 2 pushcores. [1] Mud flat/gentle up slope. Mud cloud is present/poor camera vision. Cidaris cidaris OTU211 on mud. [00:24:00] [2] Mud slope with cobble fields/sparse dead and living Lophelia pertusa reefs (<25% living). [00:28:00] [3] Isolated scleractinian colonies on soft bottom/mud (dead). [32:00:00] Mud slope again. [00:33:00] :00 shoal of eels (possibly Synaphobranchus kaupii OTU440). [00:45:00] [4] Steep mud slope with scattered cobbles/pebbles. [00:50:00] mud moderate slope. [00:53:00] [5] Carbonate cobbles on moderate slope. [00:58:00] [6] Holothurians OTU432 on mud gentle/moderate slope. [01:20:00] ROV stops for imagery of Lophelia pertusa reef on cobble and porifera encrusting blue OTU800. Then ROV checks on the machine itself and it spends some time at the bottom. [01:11:00] [7] Large cobbles on mud slope. [01:18:00] Isolated scleractinians on rocks. [01:24:00] Mud cloud. [01:29:00] [8] Encrusting sponges and isolated scleractinian colonies on rocks. [01:41:00] ROV is on top of vertical wall, on up slope. [01:51:00] [9] Vertical carbonate wall hosts isolated L. pertusa colonies. [01:56:00] [10] here L. pertusa reef is dense (<1% living). Sea urchins and anemones found on corals. [02:00:00] [11] carbonate bedrock hosts anemones. [02:05:00] coral reefs on slope. [02:08:00] [12] very sparse coral reef. Broken carbonate on steep slope. [02:17:00] ROV stops for imagery and sampling of Madrepora oculata OTU251. END VIDEO [02:23:00].

Progression Start Duration Code Name

Porifera
Blue Porifera encrusting : 800 : R
Cnidaria
Actiniaria sp. 20 : 605 : R
Bolocera tuediae : 12 : R
Phelliactis sp. 1 : 255 : R
Lophelia pertusa : 250 : R
Madrepora oculata : 251 : R
Zoanthidea sp. : 1149 : R
Anthomastus grandiflorus : 278 : R
Pseudoanthomastus sp. : 1080 : R
Umbellula sp. : 581 : R
Branchiocerianthus norvegicus : 1069 : R
Annelida
Bonellia viridis : 267 : R
Arthropoda

Chaceon affinis : 254 : R
Munida tenuimana : 339 : R
Eucarida sp. (red deep) : 1138 : R
Mollusca
Teuthida sp. 1 : 1017 : R
Echinodermata
Stichastrella rosea : 198 : R
Ceramaster/Peltaster/Plinthaster sp. 2 : 388 : R
cf. Echinus (deep pink spine) : 1129 : R
Cidaris cidaris : 211 : R
Hygrosoma sp. : 1125 : R
Araeosoma fenestratum : 188 : R
Benthogone sp. : 432 : R
Parastichopus tremulus : 266 : R
Chordata
Galeus melastomus : 1005 : R

Chimaera monstrosa : 265 : R
Synaphobranchus kaupii : 440 : R
Brosme brosme : 258 : R
Nezumia aequalis : 1003 : R
Coelorinchus caelorhincus : 303 : R
Coryphaenoides rupestris : 566 : R
Trachyrincus sp. : 446 : R
Lepidion eques : 249 : R
Mora moro : 349 : R
Lophius piscatorius : 273 : R
Trachyscorpia cristulata : 1216 : R
Actinopterygii sp. 3 : 930 : R
Actinopterygii sp. 4 : 1006 : R

Number of species = 38

© Marine Institute, MERC Consultants, Bernard Picton 2022