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Kai The Fish Guy @kaithefishguy.bsky.social · 13h

Had an amazing 8 days on the island of Buru in the Maluku Archipelago! Here are some notable pictures.

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Reposted by Kai The Fish Guy

Ed Stanley @drscanley.bsky.social · 18/09/2026

Another long-time project is out now! I scanned these specimens for @sdbnorcal.bsky.social during my Postdoc @calacademy.bsky.social! Stan & @kaithefishguy.bsky.social led this description of a new deepwater species of Butterflyfish from Mozambique. doi.org/10.1643/i202...

A CT rendering of a new species of deepwater butterfly fish.

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Reposted by Kai The Fish Guy

FishEvo Zuzana Musilova @fishevo.bsky.social · 10/06/2025

An amazing talk on mesophotic fish given by @kaithefishguy.bsky.social 😱 at #IPFC12 in Taiwan. So many new records for Australia from the deep(er) sea😍

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Kai The Fish Guy @kaithefishguy.bsky.social · 01/06/2025

Pseudojuloides edwardi Quite possibly the most beautiful wrasse in existence

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Kai The Fish Guy @kaithefishguy.bsky.social · 24/03/2025

Black background fish photography are MY NACHOS.

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Kai The Fish Guy @kaithefishguy.bsky.social · 24/03/2025

Blimey! Now THIS is a great goby! Oxymetopon cyanoctenosum, the Blue-banded Ribbongoby.

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Kai The Fish Guy @kaithefishguy.bsky.social · 21/03/2025

Yes I use all my annual leave every year to risk it all for pictures of literal INSECTS. And I love it!

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Kai The Fish Guy @kaithefishguy.bsky.social · 24/02/2025

Trogonoptera brookiana, Rajah Brooke’s Birdwing. Malaysia’s national butterfly is quite a thing of beauty. Its black wings with emerald green feather-like markings, bright red head, and blue wing accents isn’t even its most remarkable feature. It’s probably the fact that it measures close to 15 cm

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Kai The Fish Guy @kaithefishguy.bsky.social · 10/02/2025

Im posting dome dank sci comm memes on my insta story! Available only for 24 hours. Go there and see!!

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Kai The Fish Guy @kaithefishguy.bsky.social · 24/01/2025

PhD opportunity: I am looking for a PhD student to study taxonomy and systematics of labrid fishes and other coral reef taxa. Successful applicants will be jointly based at the University of Sydney and the Australian Museum Research Institute.

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Kai The Fish Guy @kaithefishguy.bsky.social · 15/01/2025

This is one of the most exciting loans I’ve ever unpacked. There are only seven specimens of Prognathodes guyotensis known from collections worldwide; three specimens in the type series, all from the Kyushu-Palau Ridge, and a further four from scattered localities across the Indo-Pacific.

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Kai The Fish Guy @kaithefishguy.bsky.social · 15/01/2025

Last weekend I was fortunate to encounter two female Yellow Jewel butterflies (Hypochrysops byzos) along a creek line about 45 minutes from Canberra. This is a very elusive and one of the more difficult of the Australian Jewels to find, so finding bro one but two was an extra special treat.

A small bright yellow butterfly with red spots and stripes outlined with metallic blue scales.

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Kai The Fish Guy @kaithefishguy.bsky.social · 09/01/2025

Watching The Boys and there’s a fish I named in one of the scenes! Cirrhilabrus cyanogularis, the Blue-throat Fairy Wrasse. I described this species in 2018!

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Kai The Fish Guy @kaithefishguy.bsky.social · 24/12/2024

Merry Christmas Wrasses! Clockwise from top left: Halichoeres cosmetus; H. ornatissimus; H. melanurus; H. claudia

4 green and red wrasses with similar stripe patterns.

Clockwise from top left: Halichoeres cosmetus; H. ornatissimus; H. melanurus; H. claudia

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Kai The Fish Guy @kaithefishguy.bsky.social · 21/12/2024

Hypochrysops delicia, the Moonlight Jewel I’ve spent many unsuccessful summers over the last few years trying to find this species around the Sydney area. Turns out they’re around, but only at the top of the tallest peaks, in the furthest corner of the Blue Mountains, and only appear after 4 pm.

A small grey butterfly with brilliant red spots and bands outlined in metallic blue.

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Kai The Fish Guy @kaithefishguy.bsky.social · 20/12/2024

Cirrhilabrus hygroxerus, the Monsoon Fairy Wrasse Two in two days! I’m feeling generous. Ok I’m gonna speed run this one. Hygro = wet Xeros = dry Wet + dry = monsoon = weather profile of Darwin = type location of this species

A small species of fairy wrasse (a type of fish) with bright red pendulous pelvic fins. The body is bicolored - black above, silver below. The head is chestnut orange and the tail is scintillating blue.

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Kai The Fish Guy @kaithefishguy.bsky.social · 19/12/2024

Cirrhilabrus bathyphilus, the “Deepwater Wrasse” This is a really beautiful species native to northeast Australia, New Caledonia, and southern Vanuatu. It belongs to a small lineage of very distinctive fairy wrasses with only two other species.

A small species of fairy wrasse with a bright red and yellow body and magenta fins. This is a species native to the eastern coast of Australia, New Caledonia, and Vanuatu.

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Kai The Fish Guy @kaithefishguy.bsky.social · 14/12/2024

How’s this for a STUNNER! Cirrhilabrus cyanogularis, the Blue-throat Fairy Wrasse! I described this species in 2018. One of the most beautiful fairy wrasses. This one is native to only a small part of the Coral Triangle, namely southern Philippines and northeast Borneo.

An orange and red fish with a brilliant navy blue throat, lending to its common name; the blue-throat fairy wrasse

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Kai The Fish Guy @kaithefishguy.bsky.social · 01/12/2024

Today’s #EtymologyEpithet is a double whammy! The first is Pseudojuloides Pluto from Ogasawara, Wake Atoll, and the Mariana Archipelago. The specific epithet is given after Pluto, god of the underworld, in reference to the sinister coloration of the males.

Males (left two panels) and females (right two panels) of the Narcissus pencil wrasse. The males are black with a blue diagonal stripe near the head. The females are white with a chestnut cap.

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Reposted by Kai The Fish Guy

viep5.bsky.social @viep5.bsky.social · 29/11/2024

Nemateleotris lavandula Tea & Larson, 2023 “…named lavandula, after the genus of flowering plants which includes the ornamental herb lavender, in reference to its beautiful colouration in life.” Location: Palau 🇵🇼 #FishFriday #EtymologyEpithet

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Kai The Fish Guy @kaithefishguy.bsky.social · 30/11/2024

Ok I’m gonna need you all to repost today’s #EtymologyEpithet far and wide because this is one of my fav fishes I’ve ever described.

A bright aquamarine blue fish with a red and yellow head.

Photo by Fenton Walsh.

A bright aquamarine blue fish with a red and yellow head.

Photo by Mark Rosenstein.

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Reposted by Kai The Fish Guy

Helen Larson @eviota.bsky.social · 12/02/2024

Marine gobies are the best. My new shirt with artwork by Courtney Hildebrandt,

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Kai The Fish Guy @kaithefishguy.bsky.social · 29/11/2024

Christmas is around the corner and for years I’ve advocated that THIS fish should be the official FISHMAS mascot. The Peppermint Angelfish, Paracentropyge boylei, is a deep water coral reef species endemic to French Polynesia. Does it not look like a peppermint candy cane? #TeamFish

A small angelfish with bright red and white bands, similar to a peppermint stick.

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Kai The Fish Guy @kaithefishguy.bsky.social · 29/11/2024

It’s been a crazy couple of hours on BlueSky! I’ve felt more invigorated on here than I’ve ever been in the last two years on Twitter. I’m so glad I made the change. Enjoy this gorgeous Pomacanthus navarchus, the Majestic Angelfish. I photographed this on my recent trip to Raja Ampat.

An orange angelfish with deep blue saddles on the head and tail swimming against coral

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Kai The Fish Guy @kaithefishguy.bsky.social · 29/11/2024

This beautiful fish is Synchiropus sycorax, the Ruby Dragonet. This was the second species I described, and it’s endemic to the Sulu Archipelago in Philippines. I gave it the name Sycorax after the Sycorax warriors from the BBC Sci-Fi series Dr Who, after the big red capes and white skeletal masks

A bright red fish with big sail like fins

Red clad warriors from the Dr Who series

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Reposted by Kai The Fish Guy

Rosemary Allison @rozesall.bsky.social · 29/11/2024

I've been waiting for Kai the Fish Guy to show up.

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Kai The Fish Guy @kaithefishguy.bsky.social · 29/11/2024

I’m so pleased to see everyone’s excitement and response to me joining blue sky! To everyone who’s asked for alt texts: I got it, and will try to remember to include them in the next time I post.

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Kai The Fish Guy @kaithefishguy.bsky.social · 29/11/2024

I don’t quite yet have the same reach on here as I did on Twitter, so I’m going to start a new fish game called #EtymologyEpithet, where I explain the etymology (the meaning behind a name) for all of the fishes I’ve described, starting with Cirrhilabrus isosceles, the Pintail Fairywrasse.

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Kai The Fish Guy @kaithefishguy.bsky.social · 29/11/2024

Hi everyone. I felt really dejected for a long time about the state of science communication on Twitter, and was reluctant to give things a try on yet another new platform. I’m so touched by the support everyone has shown so let’s give this one last go, as KaiTheFishGuy on Blue Sky!

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