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[12:36:48] <okexnav> EX1803_DIVE14 ROV powered off
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[13:13:59] <adamskarke> Okeanos Explorer on site for Dive 15. Pre-Dive Call at 8:30
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[13:30:54] <okexnav> EX1803_DIVE15 ROV Launch
[13:33:42] <danielwagner> We are waiting for ROV launch to be completed before starting with the call. Should be in ~~10 min
[13:35:43] <zachproux> Hi everyone, I'll be annotating sessile fauna today until 1:30 pm EST (12:30 CST). Looking forward to exploring this sinkhole!
[13:38:32] <okexnav> EX1803_DIVE15 ROV on Surface
[13:39:25] <okexnav> EX1803_DIVE15 ROV Descending
[13:47:32] stevenauscavitch leaves the room
[13:50:16] <amybowman> Someone has an open mic
[13:59:50] <zachproux> Can navigation please announce every 100 meters traveled?
[14:04:14] <zachproux> Thank you!
[14:04:23] <adamskarke> @zach: I have requested 100m call outs from NAV
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[14:15:04] <kimberlygalvez> Good morning everyone! Very excited for this upcoming dive
[14:17:13] <tinamolodtsova> hi daniel, it was a great dive-week and I hope the today dive will be a great end of the leg.. hope for corals))
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[14:28:19] <kimberlygalvez> Does the dive plan involve going into the slightly shallower sinkhole right above? I find it very interesting that this seems like a 2-tiered sinkhole
[14:30:03] <kevinrademacher> Bottom in view!
[14:30:09] <kimberlygalvez> sounds good
[14:30:25] <adamskarke> We plan to climb up to the ridge between the two sinkholes
[14:30:37] <tinamolodtsova> fish nursery
[14:31:01] <laurenjackson> zoom in on the fish?
[14:31:08] <okexnav> EX1803_DIVE15 ROV on Bottom
[14:31:25] <nolanbarrett> Who wants to count all of the fish? I unfortunately can't because I have lab work. :-D
[14:31:39] <kimberlygalvez> Thanks, Adam.
[14:32:03] <kevinrademacher> the elongate fish may be one of the Barracudinas, Paralepididae.
[14:33:46] <tinamolodtsova> Sargassum?
[14:34:19] <tinamolodtsova> squid)
[14:34:49] <danielwagner> Manducus maderensis
[14:35:18] <danielwagner> chiton
[14:35:27] <michaelvecchione> squid looked like Abralia, a midwater verticla migrator.
[14:35:37] <kevinrademacher> Elongate fish are barracudinas, either Lestrolepis intermedia or Lestidium atlanticum.
[14:36:03] <kevinrademacher> Mylar ballon
[14:36:36] <kimberlygalvez> :(
[14:37:26] <nolanbarrett> Goniasterid
[14:37:34] <robertcarney> mantis shrimp?
[14:37:59] <kevinrademacher> golden crab
[14:38:25] <nolanbarrett> Seastar was likely Ceramaster
[14:40:23] <kimberlygalvez> is three the possibility for loose sediment sampling?
[14:40:27] <danielwagner> Argentina striata
[14:40:31] <kimberlygalvez> *there
[14:41:00] <kevinrademacher> yes Argentina striata
[14:41:40] <kevinrademacher> Armored sea robin
[14:42:00] <danielwagner> Peristedion
[14:42:36] <kimberlygalvez> there is a lot of skeletal material in the sediments
[14:42:38] <robertcarney> dissolved O2 is low...stressed fish?
[14:42:54] <kevinrademacher> it is not a mantis shrimp
[14:43:05] <michaelvecchione> commercial penaeid shrimp
[14:43:14] <kevinrademacher> Not yet
[14:43:29] <michaelvecchione> looks like a white shrimp
[14:45:06] <kevinrademacher> close up of that elongate fish was Lestidium atlanticum
[14:45:17] <tinamolodtsova> so, most of these fish are mesopelagic?
[14:45:36] <michaelvecchione> nice closeup of Abralia
[14:45:44] <danielwagner> Bembrops
[14:45:59] <tinamolodtsova> so this is a classical view of plankton and nekton organisms trapped at seamount?
[14:47:24] kensulak leaves the room
[14:49:30] <michaelvecchione> Illex cf coindettii
[14:49:48] <kevinrademacher> Bembros was B. anatirostris.
[14:50:33] <sarabashah> Linguoid ripples formed by unidirectional current
[14:50:48] <kensulak> I do not think we can say these fishes are 'trapped'.  It is not uncommon to encounter dense aggregations of midwater fishes right on the bottom even on open slope (Sulak et al earlier publication).  The very abundant small midwater fish seen here is Maurolicus weitzmani, a stomiiform and a vertical migrator.  We have encountered such aggregations in daytime at similar depths off VA and NC - not trapped
[14:51:35] robertcarney leaves the room
[14:52:04] <kevinrademacher> Polyipnus is genus of hatchetfish
[14:52:16] <michaelvecchione> I disagree Ken. If they are vertical migrators transported by currents  over bottom depths shallower than they would normally go they do get trapped by the bottom, even on the open slope.
[14:52:57] <kensulak> There are a number of 'stunned' or injured fish on the bottom here.  Probably churned through the ROV thrusters.  The golden crab may have been a beneficiary - munching an injured squid similarly stunned.
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[14:53:40] <michaelvecchione> However, there are some species that migrate along the slope (mesopelagic boundary community). Although this was described around Hawaii I am sure it happens elsewhere.
[14:54:30] <kensulak> Mike - but if the same aggregation phenomena occurs on the open slope, as it does quite commonly - how would you explain that?
[14:55:02] <kimberlygalvez> There are sand ripples/bumps here, albeit small, but this could indicate a some current activity. Can we measure current speed?
[14:55:25] <michaelvecchione> Because the mesopelagic vertical migrators are following isolumes down until they intersect the bottom.
[14:55:28] <kimberlygalvez> if not, it could be from all the fish
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[14:56:39] <nolanbarrett> I think hermit crab
[14:57:38] <nolanbarrett> I think this second hermit crab is similar to the one in the plastic jug
[14:57:44] <kevinrademacher> hermit crab in a Scaphella shell
[14:59:20] <heatherjudkins> Mike V- did you see the squid?
[14:59:45] <kevinrademacher> Galtheid lobster in mylar balloon
[15:00:18] <kensulak> Mike:  vertical migrators display behaviors independent of isolumes.  other factors are at play:  2008. Gartner, J. V. Jr., K. J. Sulak, and S. W. Ross.  Persistent near-bottom aggregations of mesopelagic animals along the North Carolina and Virginia continental slopes.  Marine Biology 153:825-841.
[15:01:45] <michaelvecchione> Ken: upcoming research over the next couple of years is going to examine this phenomenon in detail on the US E coast.
[15:02:28] <michaelvecchione> Heather: there has been quite a few Abralia plus at least one Illex.
[15:03:24] <michaelvecchione> They got some pretty good zooms on the Abralia but I couldn't see the eye photophores.
[15:04:13] <kevinrademacher> Can we get a close up of the Peristedion
[15:04:32] <kensulak> Acoustic Doppler moorings at 500 m depth in northern GOM (U.S. Naval Research Lab - Stennis) have documented high currents on bottom generated by Hurricane Ivan.  Thus, major tropical storms can generate deep shelf waves and thus current ripples
[15:04:41] mikeford leaves the room
[15:04:57] <danielwagner> Coelorinchus caelorhincus
[15:05:11] <michaelvecchione> Ken: one thing that is really needed is to separate the oceanic species from the possible boundary-community species.
[15:05:29] <kimberlygalvez> That's really interesting, Ken. Thank you. I didn't think Hurricanes could influence sediments that deep
[15:05:32] <kevinrademacher> Anemone
[15:05:42] <danielwagner> Hoermethiidae
[15:06:20] <tinamolodtsova> Hormathidae
[15:07:46] <michaelvecchione> The King of Beers
[15:08:27] <tinamolodtsova> how long it take beer can to dissolve?
[15:09:12] <michaelvecchione> Last Dec a sunk shipping container was dated by the model of wahsing machines that were in it.
[15:09:48] <kensulak> Mike:  The most abundant midwater fish seen here today is Maurolicus weitzmani (=M. meulleri) - the same species found in NC persistent near-bottom aggregations - along with the vertical migrator Ceratoscopelus myctophid.  Both are typical coastal vertical migrators - not oceanic
[15:10:50] <tinamolodtsova> another can
[15:12:18] <michaelvecchione> Ken: there are two species of Abralia common in this area and I suspect that one is a true oceanic and the other a member of the mesopleagic boundary community. I couldn't see the photophores necessary to ID these Abralia to species.
[15:12:38] <michaelvecchione> ANother Illex
[15:14:49] <michaelvecchione> I jusut tried to explain on the phone that the reason Illex rests on its elbows is to keep the funnel (under the head) up out of the sediment so it can breath.
[15:16:07] <michaelvecchione> lost hat -- bad luck
[15:17:40] <tinamolodtsova> not only hat..
[15:18:10] <danielwagner> Laemonema
[15:18:53] <kevinrademacher> Laemonema barbatulum, shortbeard codling
[15:20:43] <kevinrademacher> Portunida crab
[15:20:49] <kevinrademacher> Portunidae
[15:20:56] <amandademopoulos> Bathynectes?
[15:21:49] <kevinrademacher> Rochina crassa, Inflated spiny crab
[15:26:50] <tinamolodtsova> have to came from place with stronger currents
[15:26:59] <shirleypomponi> Won't be able to participate for very long, but you can expect to see lithistid (rock) sponges -- fan-shaped--on the sides of the sink hole.  I believe that his is the same sinkhole where we dove with the Johnson-Sea-Link.
[15:27:33] <shirleypomponi> This...not "his".    And we know what the sponges are, so no need to collect.  We have them in our collection at Harbor Branch.
[15:27:38] <kevinrademacher> viperfish & duckbill passed over
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[15:35:22] <shirleypomponi> We also found a very interesting, red, branching lithistid sponge--which we called the "rasta sponge"--because it looked like dreadlocks!   (You probably don't want to announce that, though--it may offend some.)   The sponge was described as a new species, Theonella wrightae, named after Dr. Amy Wright--who isolated a unique chemical from this sponge; it has potent anticancer activity.
[15:35:50] <shirleypomponi> Very cool that this is a new site!   I'll be very interested in seeing if you find the same fauna in and around this sinkhole.
[15:36:21] kensulak leaves the room
[15:36:30] <shirleypomponi> And Nolan worked with Amy Wright!
[15:36:42] <nolanbarrett> Yup! So very proud of it too!
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[15:40:16] <adamskarke> 100m transit complete
[15:40:43] <kevinrademacher> viperfish
[15:42:00] mikeford leaves the room
[15:45:15] <kevinrademacher> Bembrops anatirostris.
[15:48:22] adamskarke leaves the room
[15:48:30] <tinamolodtsova> look like zoantharians
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[15:53:41] <tinamolodtsova> these crabs.... portunid crabs I mean, they vannot ve associated with sargassim? the coloration looks familia
[15:54:36] <kevinrademacher> crabs are Bathynectes longispina
[15:56:14] <kevinrademacher> blackbelly rosefish, Helicolenus dactylopterus
[15:57:15] <meganmcculler> Chris Mah said those stars look like Plinthaster dentatus
[16:01:40] iscwatch2 leaves the room
[16:03:33] <andreaquattrini> i think the Peristedion may have been P. greyea (tentative id)
[16:03:49] <andreaquattrini> P. cf. greyae
[16:07:20] <adamskarke> next 100m transit complete
[16:07:59] <zachproux> roger that, thank you
[16:08:09] <tinamolodtsova> how long it will take to the wall?
[16:09:03] <danielwagner> ~~2h
[16:10:06] <tinamolodtsova> thanks daniel
[16:13:04] <kevinrademacher> Can we get another close up of the shrimp, please.
[16:15:52] <amybowman> Is anyone else hearing video on the science call?
[16:18:29] <kevinrademacher> Thanks!
[16:18:31] adamskarke leaves the room
[16:19:41] <danielwagner> Peristedion
[16:20:54] <kevinrademacher> I keep waffling back & forth on the shrimp between pink shrimp, Farfantepenaeus duorarum or white shrimp, Litopenaeus setiferus!
[16:21:41] nolanbarrett leaves the room
[16:25:59] <danielwagner> Thanks kevin
[16:27:52] <michaelvecchione> More Illex
[16:28:15] <andreaquattrini> no this is a nezumia
[16:28:20] <kevinrademacher> Got to run, later! Great views of fish!
[16:28:39] kevinrademacher leaves the room
[16:28:39] <andreaquattrini> N. cf. aequalis
[16:29:16] <andreaquattrini> greeneye C. agassizi
[16:31:38] <danielwagner> Chaunax
[16:32:20] michaelvecchione leaves the room
[16:32:36] <andreaquattrini> cute. yes juvenile, maybe C. suttkusi?
[16:38:08] charlesmessing leaves the room
[16:39:54] <adamskarke> next 100m transit complete
[16:40:24] <zachproux> roger
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[17:02:51] <asakomatsumoto> Hello all
[17:03:27] <scottfrance> Hi Asako
[17:03:47] <asakomatsumoto> Hi Scott!
[17:04:45] shirleypomponi leaves the room
[17:05:25] <meganmcculler> Hi Asako
[17:05:49] <nolanbarrett> @Asako Good Morning!
[17:07:32] <tinamolodtsova> hi asako
[17:07:54] <scottfrance> Anemone quickly retracted in front of stylaster
[17:08:17] <asakomatsumoto> Hi Megan, Hi Nolan Good morning, Hi Tina )
[17:15:03] adamskarke leaves the room
[17:15:42] <adamskarke> Next 100m transit complete
[17:16:08] <zachproux> roger roger
[17:18:51] <kevinrademacher> back from lunch break.
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[17:20:50] <kevinrademacher> Slimehead
[17:22:50] <nolanbarrett> Plinthaster dentatus, probably 
[17:24:00] <nolanbarrett> Op nope, guess not
[17:24:25] <scottfrance> Note he is saying Peltaster, not Plinthaster...
[17:26:11] <nolanbarrett> @Scott Got that. I am trying to compare images of both... side by side its easier to see the differences. But on its own, still learning.
[17:26:42] iscwatch2 leaves the room: Replaced by new connection
[17:26:46] adamskarke leaves the room
[17:26:58] <kevinrademacher> Small Lithoides?
[17:27:10] zachproux leaves the room
[17:27:12] <nolanbarrett> More of those Blue sponges from yesterday
[17:27:24] <scottfrance> @Nola: I was actually directing that comment to Rachel, who IDed as Plinthaster in SeaScribe
[17:27:40] <rachelbassett> @scott Thanks. I corrected it.
[17:27:44] <scottfrance> :-)
[17:27:56] <scottfrance> My auto-refresh is slow!
[17:28:00] <nolanbarrett> Its okay!
[17:29:20] <robertcarney> ? Any chance these rock strata are phophates?
[17:29:28] <robertcarney> phosphates
[17:30:52] <andreaquattrini> zoom anthias again
[17:31:29] <kevinrademacher> I think it is A. nicholsi.
[17:32:07] <andreaquattrini> i don't think it is A. nicholsi. A. nicholsi has 2 bright yellow strips on the cheek
[17:32:12] <andreaquattrini> stripes on the cheek
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[17:33:52] <kevinrademacher> I though I saw yellow on the cheeks. Not a great view though, so may be wrong.
[17:34:05] <andreaquattrini> yes, yellow on cheek but diffuse
[17:34:26] <kimberlygalvez> this look amazing
[17:35:20] <andreaquattrini> daniel-if you see another anthias, can you please get a few more zooms
[17:35:56] <kimberlygalvez> this looks more like Ferromanganese crusted limestone
[17:36:16] <danielwagner> will do andrea
[17:38:04] <laurenjackson> @adam carbonate rock?
[17:39:44] <laurenjackson> sorry, Kimberly- i just saw your comment
[17:40:29] <danielwagner> Epigonus
[17:40:57] <danielwagner> Anthias
[17:41:49] <nolanbarrett> So many associates! o_O
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[17:42:58] <adamskarke> @Lauren: "Carbonate rock" is a good general term that would encompass limestone.
[17:43:34] <adamskarke> Good to keep general until we can look at the rock in the lab
[17:43:43] <kevinrademacher> Those shrimp look like Plesionika spp.
[17:44:05] <adamskarke> EX1803 DIVE15 SPEC01 GEO
[17:44:18] <danielwagner> Anthias woodsi
[17:44:31] adamskarke leaves the room
[17:44:36] <andreaquattrini> yea, i agree A. woodsi
[17:45:01] <andreaquattrini> is this the same as we saw before though?
[17:45:35] <kevinrademacher> I'm pretty sure it is.
[17:45:55] adamskarke leaves the room
[17:46:11] <andreaquattrini> k-i was wondering if the color just looked washed out from the lights
[17:46:21] <kevinrademacher> Understand
[17:50:03] <scottfrance> I have been "stung" by one of those urchin spines before. A burning pain.
[17:50:29] <tinamolodtsova> very nice urchin to pack in baskets...
[17:50:36] <scottfrance> A deep-sea one on Hawaiian area seamounts. I was pulling it out of the biobox unaware of the "danger"
[17:50:44] <scottfrance> Won't make thaht mistake again.
[17:51:52] <tinamolodtsova> I mean you can put 10 of them one by one....
[17:53:08] <adamskarke> Next 100m transit complete
[17:53:10] <tinamolodtsova> I was told that in french they call them chapeau... and  there are  real and false... and I fdo not know which one is toxic
[17:56:00] <kevinrademacher> Barracudina affected by lights!
[17:57:35] <tinamolodtsova> if these red anemones are in fact cupcorals?
[17:59:02] <tinamolodtsova> still quite possible
[17:59:32] <scottfrance> Looked like cup corals to me, but I didn't get a great look.
[18:01:07] <tinamolodtsova> @scott, skeleton is not visible, anyway
[18:03:59] <scottfrance> I thought I saw very transparent tentacles dotted with concentrated cnidae, which is more common on corals than anemones.
[18:07:22] <tinamolodtsova> @scott, I have impression that they are cupcorals..for the same reason
[18:07:51] stevenauscavitch leaves the room
[18:08:05] <tinamolodtsova> ophiuras
[18:08:16] <scottfrance> But the one just there on lower right looked like anemone...
[18:08:27] <meganmcculler> can we zoom on the bryozoan?
[18:09:25] <scottfrance> Not seeing lophophores, how would I sepearte this from a sponge?
[18:09:30] <scottfrance> *separate
[18:10:07] <tinamolodtsova> @scott, by sculpture.... you can figure out were separate zooids are
[18:10:19] <tinamolodtsova> tripod fish
[18:10:52] <scottfrance> @Megan: I mean, at that gross level, how do you distinguish that lattice "colony" as a bryozoan or a sponge if you cannot see extended lophophores? Is there another clue to use?
[18:10:59] <tinamolodtsova> or human debris? remaining tripod.... may be tripod itself
[18:11:13] asakomatsumoto leaves the room: Replaced by new connection
[18:11:29] <tinamolodtsova> @scott, you can see outline of zooids
[18:11:59] robertcarney leaves the room
[18:12:19] <scottfrance> @Tina: maybe my screen is too small. I was looking!
[18:12:55] rachelbassett leaves the room
[18:13:02] <tinamolodtsova> @scott, aprtures...
[18:13:28] <meganmcculler> @Scott good question - I haven't really thought about it too much, but I would agree with Tina and that you can't see any indication of spicules. Very smooth calcareous skeleton
[18:13:54] mikeford leaves the room
[18:14:16] <nolanbarrett> Lithistid or rock sponge just in the foreground of these fish
[18:15:12] <tinamolodtsova> @scott, actually the main trouble I usually have is to decide if it is stylasterid or bryozoan..
[18:15:54] <nolanbarrett> Gastropods
[18:16:54] <tinamolodtsova> because some really look alake
[18:17:18] <adamskarke> Next 100m transit complete
[18:17:39] <scottfrance> @Tina, @Megan: I just did  aquick search to find an image of a sponge with that similar morphology, and I couldn't find one! So perhaps I can rule out sponges. But be uncertain about stylasterid! :-)
[18:18:04] <kimberlygalvez> quite a lot of unconsolidated sediments up here still
[18:18:50] <nolanbarrett> @Scott You may have to rule out some carnivorous sponges
[18:19:25] <scottfrance> @Nolan: yup. But I have a gestalt for identifying them. Just don't ask me what it is!
[18:19:58] <danielwagner> Liponema
[18:20:14] <nolanbarrett> Hahaha okay! I'll let the sponge and bryozoan experts decide!
[18:21:50] <meganmcculler> @Tina, @Scott I have gotten bryozoans and stylasterids mixed up before, but mainly because I want to see bryozoans :D
[18:25:25] <tinamolodtsova> another star
[18:26:03] <nolanbarrett> I'm just gonna say goniasterid this time
[18:26:04] <tinamolodtsova> cookiestar
[18:29:01] <sarabashah> Looks like honey-combed solution cavities
[18:29:08] <tinamolodtsova> 2 hermitcrabs
[18:31:48] <andreaquattrini> not many corals today?
[18:32:19] <tinamolodtsova> another star
[18:32:27] <danielwagner> 4 stylasterids so far
[18:32:35] <tinamolodtsova> right
[18:33:04] <sarabashah> Thank you very much, we are very excited about the unusual formation that we are seeing now - Gregor & Sara
[18:33:41] <tinamolodtsova> @andrea, not yet, I hoped for more
[18:34:27] <kevinrademacher> Later all! Got a meeting to attend.
[18:34:35] kevinrademacher leaves the room
[18:34:57] <scottfrance> Who is guarding who here?
[18:35:21] <tinamolodtsova> sleeping crab
[18:35:27] <nolanbarrett> At first I thought the crinoid was on the crab
[18:35:59] <tinamolodtsova> meditation...
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[18:40:37] <danielwagner> Leiodermatium
[18:40:38] <nolanbarrett> Lithistid sponge in front
[18:41:44] <nolanbarrett> Could be corallistidae instead of Leiodermatium (says Shirley Pomponi
[18:41:46] <adamskarke> Next 100m Transit Complete
[18:43:55] <nolanbarrett> Aphrocallistes
[18:43:58] <danielwagner> thanks nolan
[18:44:46] <nolanbarrett> Yep, you're welcome. And thank you for zooming on them!
[18:46:56] <nolanbarrett> @Joana if youre watching the low latency feed, go back about 7 minutes to see a demosponge
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[18:47:54] <joanaxavier> Hi all, hi Shirley :-)
[18:50:38] <asakomatsumoto> Hi Joana!
[18:52:18] <danielwagner> sinkholes in sinkholes
[18:52:37] adamskarke leaves the room
[18:52:55] <nolanbarrett> Holey Sink-ception, Batman!
[18:54:20] <joanaxavier> @nolan I had a look and I agree with Shirley, it could be Corallistidae
[18:55:07] <nolanbarrett> @Joana Awesome, thanks! Im still learning a ton about IDing demosponges
[18:55:43] adamskarke leaves the room
[18:56:44] <nolanbarrett> This seastar is more plinthaster like. Rays are not as elongated as Peltaster.
[18:57:20] <nolanbarrett> Another goniasterid, very full looking.
[18:57:35] <tinamolodtsova> not many corals..
[18:59:44] heatherjudkins leaves the room
[18:59:49] <joanaxavier> @Shirley have you come across any specimens of Vazella? I was hoping we'd find some here.
[19:01:19] <adamskarke> Next 100m Transit Complete
[19:02:56] <danielwagner> Chascanopsetta
[19:03:55] <andreaquattrini> zoom head again
[19:04:13] <tinamolodtsova> increadible eyes
[19:04:24] <nolanbarrett> Looks left sided? So would that be a Bothid?
[19:05:36] <andreaquattrini> there are several left eyed families, but i do not think it is a Chascanopsetta
[19:07:22] meganmcculler leaves the room
[19:07:26] <andreaquattrini> i don't know it~~standby...
[19:08:41] <tinamolodtsova> thy all move like that?
[19:08:51] <tinamolodtsova> they
[19:09:27] <nolanbarrett> @Tina Are you asking about the eyes or the way they move on the seafloor?
[19:09:50] <tinamolodtsova> seafloor moving
[19:10:08] <tinamolodtsova> like slugs
[19:10:26] <shirleypomponi> Yes, that is correct: Aphrocallistes beatrix
[19:10:47] <joanaxavier> yep
[19:11:05] <shirleypomponi> FYI, potent antitumor compounds have been  isolated by the HBOI group from this sponge as well!
[19:13:32] <joanaxavier> wow, that's quite a field
[19:15:38] <nolanbarrett> @Shirley I told them about Aphrocallistin yesterday. I am always impressed with the compounds that sea creatures make!
[19:16:53] scottfrance leaves the room
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[19:17:39] <williamshedd> I just joined the dive and saw the tube worms you noted and carbonate rocks that appeared to be authigenic, suggesting hydrocarbon seepage.  Also, the depth you're at today is the same depth that BOEM has identified most of the pockmarks in the GOM.  Do you have specific information to indicate a sinkhole vs a seep induced pockmark?  300-500 meters is around the updip edge of gas hydrate stability.  At the last glacial maximum (and sea level minimum), the drop in sea level would have been enough for hydrates to dissociate Gulf-wide.  Additionally, we saw small pockmarks within large pockmarks, I believe at GC 140, similar to what you described as sinkholes within sinkholes.  Just a thought
[19:18:49] joanaxavier leaves the room
[19:19:27] <williamshedd> BOEM has no data in this area to help with this idea
[19:20:09] <danielwagner> Phakellia
[19:21:03] <joanaxavier> yes, it looks like it
[19:24:46] <joanaxavier> to me they look like demosponges
[19:24:51] <adamskarke> Bill: interesting idea. Are you aware of any hydrate pockmarks found in carbonate rock elsewhere?
[19:25:53] <tinamolodtsova> Astropectinidae?
[19:28:25] <tinamolodtsova> ah.. Benthopaectinidae... I have mixed up everything
[19:28:48] <joanaxavier> @dan I think the sponge to the right (we saw a while ago) could be a Pachastrella (Order Tetractinellida; Family Pachastrellidae)
[19:29:08] <danielwagner> thanks Joanna
[19:30:24] <joanaxavier> @dan at least there's something rather similar to it in the NEA/MED
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[19:33:31] <joanaxavier> the hermit crab didn't see that sponge coming :-D
[19:36:10] <tinamolodtsova> shallow-water hermit crabs have nice shells...
[19:36:11] thomasritter leaves the room
[19:38:04] <joanaxavier> @dan since these Phakellias are so common, and characterize this habitat, it would be great to have a sample for proper identification
[19:38:15] mikeford leaves the room
[19:38:21] <joanaxavier> if possible
[19:38:23] <tinamolodtsova> finally, we need some corals... at least  for last half of hour
[19:38:41] <adamskarke> Next 100m complete
[19:38:43] <asakomatsumoto> I strongly agree with Tina!
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[19:41:09] <joanaxavier> @dan so, is there a catalogue of specimens previously collected in this region? That would be very useful for me
[19:41:48] <danielwagner> will send it to joanna this evening
[19:42:03] <joanaxavier> thanks
[19:42:08] <nolanbarrett> @Joana Ask @Shirley if they are at the HBOI frozen collection
[19:42:20] <joanaxavier> I'll do that
[19:42:32] shirleypomponi leaves the room
[19:42:49] <nolanbarrett> @Tina and @Asako I also agree!
[19:45:07] <nolanbarrett> @Joana I know there is at least a member of the Pachastrellidae in the HBOI collection, but I do not know what the relation of it would be to these. Only reason I know that is because a friend of mine did a project on it.
[19:49:01] shirleypomponi leaves the room
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[19:53:52] <adamskarke> Next 100m Transit Complete
[19:54:01] <sarabashah> Can we zoom in on the sediments?
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[19:55:16] <kimberlygalvez> there is a surprising amount of unconsolidated sediments from the top of the terrace now along with low current speeds. Could this have anything to do with the sinkhole? Currents are dipping into the sinkhole and whats directly adjacent may not be as affected by the currents?
[19:55:32] <kimberlygalvez> (thus allowing deposition?)
[19:55:47] <sarabashah> Coarse-grained, but no more pteropods in comparison to other dive sites
[19:56:37] <kimberlygalvez> oh wow! this is all hard grounds..without ferromanganese crusting.
[19:58:46] <scottfrance> Guess we maxed out on the corals yesterday!
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[20:02:50] joanaxavier leaves the room
[20:04:06] <kimberlygalvez> despite the lack of corals, we still saw and learned a lot today! Thanks for the trip! ")
[20:06:42] <tinamolodtsova> hey it may be one tiny-winy bamboo finally....
[20:06:59] <tinamolodtsova> actually I hoped for black coral...
[20:07:55] <kimberlygalvez> I thought there would be black whips here too.
[20:09:19] <danielwagner> Centrodraco
[20:10:09] <meganmcculler> I've got to go, but thanks for the dive and great expedition!
[20:10:44] <adamskarke> Megan: Thanks for joining and contributing!
[20:10:52] <tinamolodtsova> it is not thrue.. there are plenty of pteropod shells
[20:11:16] joanaxavier leaves the room
[20:11:21] <kimberlygalvez> I was about to say, based on the sifting this guy is doing, there is plenty of sediment
[20:11:30] <meganmcculler> @Adam you're welcome! Looking forward to the next expedition. I'll be living in North Carolina then!
[20:13:20] <nolanbarrett> @Megan Thank you and good luck with the move!
[20:13:49] meganmcculler leaves the room
[20:16:23] <kimberlygalvez> would is be possible to try to blow away some of the sediment surrounding the mini outcrop features to see if everything underneath is encrusted by ferromanganese?
[20:16:44] <kimberlygalvez> I remember that on the W. FL Shelf there was an area of recently exposed outcrop that didn't have any encrusting on it
[20:16:56] <kimberlygalvez> Just wondering if that's the same case here
[20:17:18] <nolanbarrett> Maybe a baby hymenaster--the slimestar
[20:17:31] <kimberlygalvez> mess is good!
[20:19:57] <nolanbarrett> Wrong on that seastar to, but its great to know that this is really rare and interesting
[20:20:08] <tinamolodtsova> may be we can collect it???
[20:21:05] <tinamolodtsova> if tehre are two of them???
[20:21:58] <tinamolodtsova> left of it there is another star
[20:22:12] <asakomatsumoto> if it is quite rare, it may be good for the collection..
[20:22:16] <danielwagner> sorry tina, this is going to be too difficult for the pilots
[20:22:52] <asakomatsumoto> understand Daniel
[20:23:24] <tinamolodtsova> i@daniel, yes, it is too small
[20:25:18] <scottfrance> Excellent point from Chris Mah that we are generating so much "expertise" in recognizing deep-sea fauna where only a few years ago many of us experts had never seen them alive ourselves. Kudos to the OkEx program!
[20:26:16] <nolanbarrett> @Scott I absolutely agree! It is indeed absolutely wonderful!
[20:26:55] <scottfrance> This wonderful program is threatening my job security! ;-)
[20:27:18] <asakomatsumoto> @Scott: indeed! it is so exciting to see them "alive"
[20:27:23] <joanaxavier> :-D
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[20:27:58] <nolanbarrett> @Scott Ehhh.... I don't know about that. While there may be new expertise, experience is truly valuable.
[20:28:17] <nolanbarrett> No I'm not saying you're old. But I am young and naive
[20:29:07] <kimberlygalvez> I love that not only can we now observe everything in situ, but these programs that involve the general public for extensive knowledge of the deep/benthic ocean environments. I love seeing the faces of jr scientists when they see that there is so much more to ocean than what's at the surface.
[20:33:03] <scottfrance> @Nolan: I am old though, even if you aren't saying it.
[20:33:20] <scottfrance> ;-)
[20:33:34] <nolanbarrett> :-D
[20:33:43] <joanaxavier> @dan demo sponges are also composed of siliceous spicules
[20:33:48] <joanaxavier> demosponges
[20:33:55] <nolanbarrett> There's that tiny little urchin without large spines on top
[20:36:32] <joanaxavier> there's only a small number of species within Demospongiae which are void of spicules
[20:37:20] <danielwagner> copy that joanna, i meant no silicious spicules
[20:38:06] <joanaxavier> @dan but all spicules in both Demospongiae and Hexactinellida are siliceous
[20:38:41] <joanaxavier> it is only in Class Calcarea that they are made of calcium carbonate
[20:45:16] <sarabashah> Thank you for the dives! Interesting ecosystem in the sinkholes. The pedestal rock is a highlight for me - thought this kind of erosion can only be formed in a desert environment.
[20:47:13] <scottfrance> Y'all come back for the next leg! June 11-July 2!
[20:48:14] <okexnav> EX1803_DIVE15 ROV Ascending
[20:48:24] <scottfrance> @Sara: check out the Mountains in the Deep expedition on the website - EX1705 - from May/June in 2017. Spectacular erosional feature seen on that cruise.
[20:48:36] <tinamolodtsova> thanks for the dive, thanks for the expedition
[20:49:18] <sarabashah> Thanks @Scott - I will definitely check them out!
[20:50:17] <asakomatsumoto> Thank you very much for the great dive and cruise! Thank you for everyone!
[20:50:29] <nolanbarrett> @Scott Will do! Thank you everyone for such a fantastic expedition! Its great to know that there are still mysteries even so close to home! (I'm in Charleston)
[20:50:34] <joanaxavier> thank you all!! This was a great experience. Meet you again in the chatroom soon
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[20:51:50] <scottfrance> June 11! Dates have changed
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[20:53:42] <danielwagner> debrief call at 4 CT
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[21:30:30] <okexnav> EX1803_DIVE15 ROV on Surface
[21:47:52] <okexnav> EX1803_DIVE15 ROV Recovery Complete
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[23:37:06] <okexnav> EX1803_DIVE15 ROV powered off