Marine Institute
SeaRover Dive Video

D679 Transect 29 The sediment is predominantly muddy on gentle/moderate slope with patches of dense brachiopods and sparse fields of pebbles/cobbles. P2. Water depth: 1212m. Feature: Soft sediment slope

Highlights: Brachiopods Fishing net Chimaera opalescens Chimaera & sea pens Fish - Trachyscorpia cristulata Red sea fan

Of note: Clusters of brachiopods on soft sediment and a lot of plastic..

There is evidence of bioturbation and the occasional burrow in the soft sediment. Clusters of brachiopods and occasional xenophyophores occur. Numerous eels, starfish and some smooth Phelliactis anemones are also noted. The bamboo coral Acanella sp., anemones and asteroids are abundant on the lower slope. Sea pens dominate at the upper end. Some Desmophyllum rubble is encountered. An interesting red octocoral was sampled. A lot of plastic is observed, scattered across the transect.

START VIDEO [00:00:00]/10:34. The sediment is predominantly muddy on gentle/moderate slope with patches of dense brachiopoda aggregations and sparse fields of pebbles/cobbles . [1] [00:01:00] ROV stops for sampling two pushcores. Seabed shows aggregations of Brachiopoda since the beginning of the dive. [00:16:00] Dense brachiopod aggregation on muddy moderate slope. [00:18:00] Here ROV comes across a large boulder hosting encrusting species and fishing line/nets. [00:23:00] Frequent Zoroaster fulgens recorded. [00:24:00] Brachiopod aggregations continue here on muddy slope. [00:58:00] Now Brachiopoda sp. aggregations start again from this point. [01:09:00] coral rubble on gentle/moderate muddy slope. [00:01:31] [01:36:00] ROV stops for sampling octocoral (poss Swiftia). END VIDEO A 12:22. START VIDEO B [01:52:13]/12:28 . Short video showing an homogeneous biotope featuring mud and sparse epifauna, mainly Phormosoma placenta and Zoroaster fulgens, on moderate/steep slope. END VIDEO [00:02:16]/12:51.

Progression Start Duration Code Name
8[00:00:00]00:24:40M.AtMB.MuAtlantic mid bathyal mud
4[00:28:19]00:29:53M.AtMB.Mu.EreCorErect coral field on Atlantic mid bathyal mud
6[01:16:10]00:26:10M.AtMB.MuAtlantic mid bathyal mud

Foraminifera
Syringammina fragilissima : 261 : R
Porifera
Hyalonema sp. 1 : 917 : R
Porifera encrusting sp. 1 (white) : 1 : R
Cnidaria
Cerianthidae sp. 1 : 2 : R
Pachycerianthus multiplicatus : 458 : R
Actiniaria sp. 1 : 4 : R
Actiniaria sp. 20 : 605 : F
Actiniaria sp. 28 : 980 : R
Sagartidae sp. (wide oral disc) : 1118 : R
Bolocera tuediae : 12 : R
Actinostolidae sp. 1 : 132 : R
Adamsia sp. : 1066 : R
Phelliactis sp. 1 : 255 : F
Caryophyllia sp. 2 : 6 : O
Lophelia pertusa : 250 : R
Epizoanthus sp. 1 (Paguridae associated) : 317 : R
Acanthogorgia cf. armata : 608 : R
Acanella arbuscula : 585 : F
Swiftia sp. : 661 : R
Pennatulacea (indet.) : 1114 : R
Kophobelemnon stelliferum : 442 : F

Pennatula inflata : 1183 : R
Umbellula sp. : 581 : R
Rhodaliidae sp. 1 : 950 : R
Annelida
Serpulidae sp. 1 : 106 : R
Arthropoda
Munida tenuimana : 339 : R
Paguridae sp. : 205 : R
Caridea (indet.) : 1077 : R
Munidopsis sp. : 1126 : R
Mollusca
Teuthida sp. 1 : 1017 : R
Teuthida sp. 1 : 1017 : R
Brachiopoda
Brachiopoda sp. 1 : 34 : A
Mollusca
Hypsogastropoda sp. : 621 : R
Echinodermata
Pentametrocrinus atlanticus : 436 : R
Crinoidea sp. 1 : 131 : R
Ophiactis abyssicola : 100 : R
Ophiuroidea sp. 1 : 26 : R
Ophiuroidea sp. 10 : 640 : R
Brisingidae sp. : 274 : R

Zoroaster fulgens : 988 : C
Pseudarchaster sp. 1 : 433 : R
Pterasteridae sp. : 299 : R
Echinus sp. : 445 : R
Cidaris cidaris : 211 : R
Phormosoma placenta : 555 : F
Echinoidea sp. 1 : 279 : R
cf. Psolus sp. : 1049 : R
Holothuroidea sp. (pink deep) : 1179 : R
Chordata
Galeus sp. : 1305 : R
Rajiformes sp. 1 (Neoraja caerulea?) : 652 : R
Hydrolagus cf. mirabilis : 1024 : R
Synaphobranchus kaupii : 440 : R
Coryphaenoides rupestris : 566 : R
Lepidion eques : 249 : R
Mora moro : 349 : R
Polyacanthonotus rissoanus : 552 : R
cf. Rouleina attrita : 1074 : R
Aphanopus carbo : 1097 : R
Zoarcidae sp. 1 : 259 : R
Cottunculus microps : 128 : R
Trachyscorpia cristulata : 1216 : R
Actinopterygii sp. 3 : 930 : R

Number of species = 62

© Marine Institute, MERC Consultants, Bernard Picton 2022