Marine Institute
SeaRover Dive Video

D573 Transect PB23 Elasmobranch nursery ground on Lophelia reefs and scattered boulders. Priority. Features: SAC, Ridge. Water depth: -740 m. TL: 1.2km SOL: 12° 48.878' W 52° 13.511' N

Highlights: Shoal of blackmouth dogfish - Galeus melastomus & egg cases Sailfin rough shark Sailfin rough shark Sea urchins Crab - Bathynectes Octopus Crab - Paromola cuvieri

Initially a sloping muddy sediment with scattered gastropods; over the top of this slope, coral gravel and mud in which echinoids dominate. Blackmouth catshark are frequent over cobble/boulder field which occurs on a steep slope. Coral framework/coral gravel intersperse with areas of bedrock with crevices in the rock. In some area of this coral framework echinoids dominate. The large spider crab Paramola cuvieri was observed among the cobbles.

START VIDEO [00:00:00]/23:00. [1] Muddy slope with scattered gastropods. ROV stops for sampling two pushcores. [00:25:00] ROV stops, goes backwards, then forwards. It zoomed in and then moves slowly forward. [00:27:00] [2] Steep hill hosts coral gravel/mud sediments. Dark sea urchins OTU1119 dominate. [00:28:00] ROV moves slowly up hill. [00:52:00] [3] Now coral framework/coral gravel on steep hill. Sea urchin dominates on coral gravel. Galeus malestomus becomes frequent. [00:55:00] [4] Cobble/boulder on steep hill. Coral framework/coral gravel. Shoal of Galeus melastomus OTU1005. [00:59:00] [5] Nursery ground of G. melastomus OUT1005. [01:18:00] ROV stops for imagery of dead G. melastomus OTU1005 on the sea floor. Crustaceans OTU200, amphipods and other scavengers eat the rest of the carcassí flesh. [01:33:00] [6] ROV climbs steep hill. Still coral framework and G. melastomus swimming around. [01:34:00] Some egg cases. [01:37:00] [7] Bedrock with crevices in the rock. Coral framework still present. Pink sea urchins dominate. The ROV moves forward and upwards. [01:43:00] ROV stops for imagery of octopus. [01:44:00] [8] ROV reaches a flat/gentle upslope with coral framework and plenty of shark egg case. [01:48:00] [9] Coral framework and bedrock substrata. G. melastomus still present. [01:50:00] ROV stops for imagery of Paramola cuvieri OTU304 found among cobbles. END VIDEO [02:00:00]/01:00.

Progression Start Duration Code Name
1[00:00:00]00:25:46M.AtMB.MuAtlantic mid bathyal mud
2[00:25:47]00:29:13M.AtMB.Bi.CorReeAtlantic mid bathyal cold water coral reef (biogenic structure)
3[00:55:01]00:01:35M.AtMB.Bi.CorReeAtlantic mid bathyal cold water coral reef (biogenic structure)
4[00:56:37]00:38:26M.AtMB.Bi.CorReeAtlantic mid bathyal cold water coral reef (biogenic structure)
5[01:35:04]00:07:31M.AtMB.Bi.CorReeAtlantic mid bathyal cold water coral reef (biogenic structure)
6[01:42:36]00:06:14M.AtMB.Bi.CorRee.LopFraMixed coral assemblage on Atlantic mid bathyal Lophelia pertusa reef framework (biogenic structure)
7[01:48:51]00:07:11M.AtMB.Bi.CorReeAtlantic mid bathyal cold water coral reef (biogenic structure)
8[01:56:03]00:03:54M.AtMB.Bi.CorReeAtlantic mid bathyal cold water coral reef (biogenic structure)

Cnidaria
Cerianthidae sp. 1 : 2 : R
Pachycerianthus multiplicatus : 458 : R
Lophelia pertusa : 250 : O
Arthropoda
Paromola cuvieri : 304 : R
Munida sarsi : 200 : R
Paguridae sp. : 205 : R
Bathynectes sp. : 235 : R
Majoidea sp. : 1121 : R
Cirripedia sp. 1 : 82 : R
Mollusca
Muusoctopus johnsonianus : 1194 : R
Teuthida sp. 1 : 1017 : R
Cephalopoda sp. : 73 : R

Hypsogastropoda sp. : 621 : R
Echinodermata
Stichastrella rosea : 198 : R
Porania sp. : 263 : R
Pterasteridae sp. : 1115 : R
Velatida sp. 2 : 1068 : R
Echinidae sp. (dark) : 1119 : F
Echinidae sp. (pink) : 194 : O
Cidaris cidaris : 211 : R
Chordata
Galeus melastomus : 1005 : F
Centrophorus squamosus : 1048 : R
Oxynotus paradoxus : 9984 : R
Chimaera monstrosa : 265 : R
Synaphobranchus kaupii : 440 : R

Argentinidae sp. 1 : 1188 : R
Molva molva : 654 : R
Nezumia aequalis : 1003 : R
Trachyrincus sp. : 446 : R
Lepidion eques : 249 : R
Phycis blennoides : 1020 : R
Trichiuridae sp. : 1303 : R
Helicolenus dactylopterus : 227 : R

Number of species = 33

© Marine Institute, MERC Consultants, Bernard Picton 2022