Favoritos de bgregoire

I'm pretty sure these are red hake though I might be incorrect. It's hard to see where the mouth terminates relative to eye, but the pelvic fin ray seems to terminate a little after anterior start of anal fin. Mottled brownish (with dive lights). These were schooling by the thousands at the Patriot shipwreck ≈30m depth. A couple sculpin in the mix too.

Dasysiphonia japonica maybe. 1:1 macro shot. The floating reddish orange bits in the second image.

https://www.unh.edu/unhtoday/2017/05/ocean-invasives

https://www.aphotomarine.com/red_seaweed_dasysiphonia_japonica.html

Specimen is slightly damaged as I tucked it into my dive glove to collect.

Collected and kept 4 in tanks for several days. Natural habitat is sand, but photos were taken in the tank, so only siphons are tagged here. Location and date refer to the collection. Last photo shows a complete specimen.

Tangled with random branching. Branches not tapering at tip and not tapering at stem. Round, not flattened. Twigs not organized like Iris Moss. Not slimy. Tossed onto beach near high tide line with wrack. Identification help will be appreciated. This is reported in Nova Scotia and New Brunswick, and we have had storms from that direction recently.

Sea Felt may best be identified from its overall morphology. It appears most often as a brown cloud attached to Fucus but can occur washed in unattached.
It is incredibly fine close-to and cannot be identified with just close up photos. It is JUST possible to see, via a x10 glass, the woven filaments which appear to make very fine 'ropes' - if you can see those, then you're on a good bet - Picture 11. Beyond that you will have to spend quite a time at the microscope to get photos of the minute features that ID it positively - the general cell structure and the specific presence of intercalary sporangia, mid-length of those microscopic filaments will thus conform the ID - Picture 12.
In short BOTH views are normally required for ID, one general view of its overall morphology and one of the 'rope' structure or the mid-filament reproductive cells.

See http://www.outerhebridesalgae.uk/marine/marine-species.php?id=40
and
http://www.seaweedsofalaska.com/species.asp?SeaweedID=49

Might be wishful thinking narrowing down to genus. I did my best to get clear images from every perspective I could. 2.5 meters deep, Likely close to 2.5 cm in length. This was one of the most difficult things I've ever photographed underwater. It was so fast and unpredictable, held many positions in the water column.