Hannah Owens's Avatar

Hannah Owens

@hannahoish

She/her. Fixed-term Assistant Professor; Center for Macroecology, Evolution, and Climate and Center for Global Mountain Biodiversity; Globe Institute; Copenhagen University. Ecology & evolution w/ natural history collections and R. #FishADay Ally is a verb

411
Followers
360
Following
251
Posts
05.12.2024
Joined
Posts Following

Latest posts by Hannah Owens @hannahoish

Now That's Deep...And CLOSE!
Now That's Deep...And CLOSE! YouTube video by oceanexplorergov

#FishADay Albatrossia pectoralis Giant Grenadier. Deep (usually 400 to 1,000 m) benthic North Pacific, up to 2m long. Juveniles seem to be pelagic, settling to the bottom as they mature. Glorious video by NOAA Ocean Exploration youtu.be/yuLDm3mXvas

06.03.2026 14:02 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
A colour photograph of a display of fourteen books written by, or about, women i science. These are displayed alongside information sheets on former MBA researchers Molly Spooner, Marie Lebour and Mary Parke as well as Miriam Rothschild, who was briefly spent time at the MBA

A colour photograph of a display of fourteen books written by, or about, women i science. These are displayed alongside information sheets on former MBA researchers Molly Spooner, Marie Lebour and Mary Parke as well as Miriam Rothschild, who was briefly spent time at the MBA

#February11 is International Day of Women and Girls in Science πŸ”¬ We are privileged to have a wide variety of books in our collection by, or about, women in science and marine biology. So to celebrate we've set up a display of a small selection of them in our Reading Room @thembauk.bsky.social

11.02.2026 09:28 πŸ‘ 10 πŸ” 6 πŸ’¬ 0 πŸ“Œ 0
Dash Dot Goatfish and the Barbels
Dash Dot Goatfish and the Barbels YouTube video by Ismail Nadheem

#FishADay Parupeneus barberinus Dotdash goatfish. Indo-Pacific reef flats and lagoons down to 100m. Names for caudal peduncle dot and prominent stripe; stripe is black in shallower fishes, red in deeper ones. Enjoy some classic barbel snuffling through sand for tasty morsels.

youtu.be/YxK9lrHQbYw

05.02.2026 10:14 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
Stream Life in Hawaiβ€˜i National Parks (U.S. National Park Service) How changes in weather patterns effect animal life in streams monitored by PACN I&M

#FishADay Eleotris sandwicensis O'opu 'akupa aka Sandwich Island Sleeper. Hawai'i's only endemic sleeper goby. Hatch in lower streams, move down to marine waters to mature, then return to freshwater. Increasingly frequent droughts on the islands could be a problem. www.nps.gov/articles/pac...

02.02.2026 14:00 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Much more relaxing than having Mads Mikkelsen read a list of Danish town names.

02.02.2026 06:07 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Preview
Bringing blackbanded sunfish back to blackwater habitat in Maryland | U.S. Fish & Wildlife Service On a picture-perfect, mid-September Monday, a dozen staff from the Maryland Department of Natural Resources and the U.S. Fish and Wildlife Service caravaned down a rutted dirt road in a Wildlife Manag...

#FishADay Enneacanthus chaetodon Blackbanded Sunfish. Thrives in tannic, vegetated waters from New Jersey to Florida. Range decreasing and fragmenting with drying of wetlands; extirpated or endangered in some parts of Eastern US. Pet trade also a problem in some places. www.fws.gov/rivers/story...

30.01.2026 13:19 πŸ‘ 16 πŸ” 7 πŸ’¬ 0 πŸ“Œ 0

Maybe it needed a belly scratch?

30.01.2026 08:29 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
The Hitchhiker’s Guide to the Deep Sea: Friend, foe, or frenemy?
The Hitchhiker’s Guide to the Deep Sea: Friend, foe, or frenemy? YouTube video by MBARI (Monterey Bay Aquarium Research Institute)

#FishADay Icichthys lockingtoni Medusafish. N. Pacific Ocean, pelagic. Young seen offshore sheltering in jellyfish (time code 0:29 in this video from @mbarinews.bsky.social, although really, you should watch the whole thing; there are juvy king crabs riding a sea pig).

youtu.be/VhG7LNUcvYc

29.01.2026 14:04 πŸ‘ 10 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0

Ha!

28.01.2026 14:25 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
First record of the goblin shark (Mitsukurina owstoni) in the Canary Islands
First record of the goblin shark (Mitsukurina owstoni) in the Canary Islands YouTube video by Gonzalo Mucientes

Here's post-release footage.

youtube.com/shorts/Y-5bm...

28.01.2026 09:35 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Preview
First Record of the Goblin Shark (Mitsukurina owstoni) in the Canary Islands - Thalassas: An International Journal of Marine Sciences We report the first confirmed observation of a live goblin shark (Mitsukurina owstoni) in waters of the Canary Islands (Spain). The specimen, approximately 250 cm in total length, was incidentally cap...

Here's the paper: doi.org/10.1007/s412...

28.01.2026 09:35 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Preview
Rare deep-sea shark seen for first time in Canary Island waters First-of-its kind sighting expands knowledge about elusive sharks , and underlines importance of the Canary Islands’ deep water habitats

#FishADay Mitsukurina owstoni Goblin Shark. Benthopelagic, mostly near continental slopes and seamounts. Known from < 250 captured individuals, so a recent well-documented recreational rod-and-reel capture (and release!) off the Canaries is very exciting.

oceanographicmagazine.com/news/rare-de...

28.01.2026 09:35 πŸ‘ 5 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0
Preview
File:Faroe stamp 249 false boarfish (neocyttus helgae).gif - Wikimedia Commons

In Faroese, the species is called "King of Diamonds", which is much more evocative. commons.wikimedia.org/w/index.php?...

26.01.2026 09:02 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Here's the study. bioone.org/journals/bul...

26.01.2026 09:02 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Oreo (aka, False Boarfish): Voyage to the Ridge 2022
Oreo (aka, False Boarfish): Voyage to the Ridge 2022 YouTube video by oceanexplorergov

#FishADay Neocyttus helgae False Boarfish. North Atlantic below 900m. 2009 submersible study documented territorial displays, including raising dorsal fin spine and trying to bite the vehicle. www.youtube.com/watch?v=MhD3...

26.01.2026 09:02 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Preview
THE BARRACUDA (SPHYRAENA) DANGEROUS TO MAN The barracuda is a large, savage, superficially pikelike fish of tropical and subtropical seas. Because of its considerable size and voracious habits, it has long been accused of attacking men bathing...

This article is full of other gems, including some vicious (but accurate, @whysharksmatter.bsky.social?) attacks on the character of sharks. "The common shark is an arrant coward, and if a person falls overboard near one it
will probably at once depart in a panic." jamanetwork.com/journals/jam...

23.01.2026 14:42 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

"...the big barracuda is a fish inquisitive, utterly fearless, voracious of appetite, and seemingly implacable of temper." -- Gudger and Breder, 1928, The Barracuda (Sphyraena) Dangerous to Man, Journal of the American Medical Association.

23.01.2026 14:42 πŸ‘ 5 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Great barracuda (Sphyraena barracuda) in 4K
Great barracuda (Sphyraena barracuda) in 4K YouTube video by Red Sea Bit

#FishADay Sphyraena barracuda Great Barracuda. Global tropical and warm temperate oceans. Ambush prey in open water, swimming them down at up to 58 km/h (36 mph). Attacks on humans do happen (read on), but ciguatera seems to be biggest barracuda-associated danger.

www.youtube.com/watch?v=dOsA...

23.01.2026 14:42 πŸ‘ 11 πŸ” 1 πŸ’¬ 1 πŸ“Œ 1
Sand Smelt (Atherina presbyter) Eating baby Flatfish
Sand Smelt (Atherina presbyter) Eating baby Flatfish YouTube video by Ocellated Eelpout

#FishADay Atherina presbyter Sand Smelt. Northeastern Atlantic, shallow estuarine and coastal. Spawn from January to June. Important food fish for humans and other fishes, but enjoy a juvenile sand smelt eating a juvenile flatfish youtu.be/-mHSbsBnNpw

22.01.2026 15:05 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Dancing Juvenile Harlequin Sweetlips | 10/08/2019
Dancing Juvenile Harlequin Sweetlips | 10/08/2019 YouTube video by Borneo Diving Addicts

#FishADay Plectorhinchus chaetodonoides Harlequin Sweetlips. Found on Indo-Pacific reefs. Adults are pretty standard fish-shaped fish with big lips (hence the name). Juveniles are spectacular Batesian mimics of toxic flatworms. www.youtube.com/watch?v=M0hd...

21.01.2026 12:30 πŸ‘ 6 πŸ” 0 πŸ’¬ 0 πŸ“Œ 1
Post image

Basically the if the Pale Man from Pan's Labyrinth was a fish.

20.01.2026 11:51 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Faceless Eels in the Cook Islands Deep | Nautilus Live
Faceless Eels in the Cook Islands Deep | Nautilus Live YouTube video by EVNautilus

#FishADay Typhlonus nasus Faceless Cusk Eel. Deep (below 4k m) IndoPacific. Monotypic genus. "Faceless" because mouth is located below bulbous head and snout with large nostrils, eyes are greatly reduced. youtu.be/d3nCVWfqEK0

20.01.2026 11:51 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Nimbochromis Livingstonii Hunting Behaviour at Lions Cove - Rare Footage - Lake Malawi Cichlids
Nimbochromis Livingstonii Hunting Behaviour at Lions Cove - Rare Footage - Lake Malawi Cichlids YouTube video by African Cichlid Hub

#FishADay Nimbochromis venustus Giraffe Hap. A cichlid endemic to Lake Malawi; prefers deeper parts of the lake, where it plays dead and waits to snap up smaller, juvenile cichlids. youtu.be/-XyVW3HXu7Q

19.01.2026 14:58 πŸ‘ 8 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
Snapper 2023 Snapper is widely distributed in Australia and managed as twelve stocks. Six are sustainable, one is recovering, four are depleted and one is undefined.

#FishADay Chrysophrys auratus Silver Seabream. Amphitropical West Pacific, mostly over rocky bottoms and reefs. Prized as a food fish, sustainable in some places, but careful where they're from. Notorious for getting so hungry during spawning they'll bite your sinker. fish.gov.au/reportstock?...

16.01.2026 15:58 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Bronze Whaler Shark Rottnest!
Bronze Whaler Shark Rottnest! YouTube video by Scuba Gas Junkies

#FishADay Carcharhinus brachyurus Bronze Whaler. Global, mostly temperate, from surf zone to continental margins. Give live birth, then use shallow, inshore waters as nurseries. Oldest nursery from early miocene Pisco Basin in Peru! youtu.be/6F_ijXskNDA?...

15.01.2026 15:21 πŸ‘ 6 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Fish against Monsterworm //Scolopsis affinis mobbing
Fish against Monsterworm //Scolopsis affinis mobbing YouTube video by Jose Lachat

#FishADay Scolopsis affinis Bridled monocle bream. Western Pacific; prefer sandy or muddy bottoms near reefs. Cooperatively mob predatory worms that rely on stealth to catch prey. www.youtube.com/watch?v=gY21...

14.01.2026 15:52 πŸ‘ 5 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0
Preview
Hopliancistrus wolverine L17 / LDA15 - Catfish Codex Hopliancistrus wolverine is a very cool and fitting name, which obviously refers to the "hooks" (odontodes) they have beneath their gill covers. However, the fish in question has mostly been traded as...

This is LDA15 for those of you in the trade. For those of you that don't know what this means, aquarists came up with a parallel taxonomy for catfishes because new catfishes were being discovered and entering the pet trade faster than they could be described.

13.01.2026 15:16 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

#FishADay Hopliancistrus wolverine Wolverine Pleco. Described in 2021. As with others in the genus, males have several extensible, stout dermal "teeth" under its gills. Unlike other members of the genus, they use these teeth to jab unwitting ichthyologists. shoalconservation.org/wp-content/u...

13.01.2026 15:16 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Mating Pair of Painted Greenlings, Oxylebius pictus
Mating Pair of Painted Greenlings, Oxylebius pictus YouTube video by Ed Bierman

#FishADay Oxylebius pictus Painted Greenling. NE Pacific; shallow rocky areas. Has bounced around a bit taxonomically thanks to its weird pointy head, but (according to Eschmeyer's Catalog) it's currently found with the rest of the greenlings in Hexagrammidae. youtu.be/Gk3FMfx-2KQ

12.01.2026 13:54 πŸ‘ 4 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
Preview
New Paper Out on the Cover of Journal of Biogeography Recently, my paper β€œDepth Matters for Marine Biodiversity” was published in the Journal of Biogeographyβ€”and to my great delight, it also ended up on the cover of the December issue. Even more...

If you want to know a little more about my (cover!) article in Journal of Biogeography, "Depth matters for biodiversity", there's a blog post here: hannahlowens.weebly.com/blog-and-new...

12.01.2026 13:40 πŸ‘ 14 πŸ” 5 πŸ’¬ 0 πŸ“Œ 0