Tropical fish in the South Pacific: Genicanthus bellus and Centropyge multicolor
During the 1970s Clem ran a commercial diving operation which specialized in collecting tropical fish for the aquarium trade. While in Tahiti he was credited with the discovery of two fish: genicanthus bellus and centropyge multicolor. We find out more about the discovery of both of these fish.
Can you tell us about what you were doing in Tahiti and your discovery of a new fish?
My diving in Tahiti was from 1973 to 1974. A little less than a year. There were very few other divers there, mostly French recreational divers, who dove with knives and spear guns. They were not collecting tropical fish. I was probably the only tropical fisherman down there at the time. I had my own setup with the compressor, scuba bottles, a boat, and complete dive gear. My routine was to wake up early in the morning and walk out to my boat, which was anchored in about four feet of water on the inside reef, right in front of a house that I rented. I would load up with the gear and then meander through the interior reef to the outer reef.
The best diving was on the outside of the reef, although there was some fishing on the inside. There were certain spots where the outside reef had a sheer drop-off. The top of the reef might have been at 25 ft. and the ledge would’ve dropped straight down – probably more than 1000 ft. The fish that I first discovered, the Genicanthus bellus – its normal habitat is more than 90 ft. Diving back then, I was diving on regular air, not mixed gas. We didn’t have dive computers. I carried a ceramic disc encased in its housing that absorbed gases at theoretically the same rate that your body did. There was a little meter and when it reached the red zone, it meant that you were in your saturation zone, and you’d have to not come straight up, but hang off at various depths to outgas slowly. The Genicanthus bellus had never been seen before. It took me two bottles to catch it.
Was this at 90 ft.?
I’m not sure what depth it was. It was definitely deep and it was on a sheer wall, a drop off. So I was able to catch it by forcing it up towards the surface. As the fish got higher and higher, its air bladder expanded and it became difficult for it to swim back down. I was able to catch it that way. It did take me two bottles. I ran out of air on the first one. Then I went back down and found it again – struggling to get back down – and caught it.
I sent it off to Jack Randall at the Bishop Museum to identify, and he’s the one responsible. He’d asked me if I wanted it named after myself and I said, no, and it was named Genicanthus bellus.
And did you know when you saw it – when you were diving – that it was something special?
Yes. I’d never seen anything like it before. I didn’t know if it was a new species, but it was very beautiful. A very unusual fish. The genicanthus is from the angelfish family. It’s a very good aquarium fish. I was diving solo, so I was the only person out there diving, which was probably a little bit reckless. Most people would dive in pairs, but as fish collectors, if we did dive in pairs, we would go in opposite directions so we didn’t dive within sight of each other.
And this was collecting fish for the Los Angeles aquarium market?
Well, one of our customers was in Los Angeles. Some of our customers were in other parts of the United States, and we even shipped out to Germany. We were probably the only shippers who could reach Europe. The fish out of Tahiti were shipped to Hawaii, reacclimated in the aquarium, and then shipped out from Hawaii to reach Frankfurt. The fish were put into special bags that we inflated with pure oxygen, one fish per bag. And those were put into Styrofoam insulated containers and we would load those into LD3 containers, which is a special container that fits in the belly of the plane. The shipper would get a better freight rate that way. We would ship out these boxes of fish, sometimes 20 or 30 boxes at a time.
Can you tell us more about the other fish, the multicolor angelfish, that you also discovered?
It’s an angel fish related to Potter’s angel, which is more common in Hawaii and actually endemic to Hawaii. And this one is small, maybe three inches long. Very difficult to see. It’s generally found in 60 to 100 ft. depths. And down there, once you pass 15 ft., the color red is all gone. You don’t see red at all. So what your eye sees is brown, and this fish is purple, a reddish purple. It blends in perfectly down there. It’s easy to miss. The reason I actually set up the Tahiti operation was because of the flame angel – very common down in Tahiti. Extremely rare everywhere else in the world. The operation was centered around that. The diving back then was incredible. The interior reefs were pristine, gorgeous, and the outside reefs were virtually untouched.
Taxonomic details
Genicanthus bellus
Genicanthus bellus
Ornate angelfish
Randall, 1975
Occurences
BPBM 16840 Tahiti: Paea – outside barrier reef; vertical drop-off [Clemens Classen]
BPBM 16841 Tahiti: Paea – outside barrier reef; vertical drop-off [Clemens Classen]
Domain: Eukarya
Kingdom: Animalia
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Superclass: Gnathostomata
Subclass: Actinopterygii
Order: Perciformes
Suborder: Percoidei
Family: Pomacanthidae
Subfamily: Pomacanthinae
Genus: Genicanthus
Species: bellus
Notes:
Located in Eastern Indian Ocean: Cocos-Keeling Atoll. Pacific Ocean: Philippines, Palau, Guam, Cook Island and the Society Islands. Recently reported from Tonga.
Max length 18cm. Schools found along steep current-swept outer reef drop-offs from 80 to 360 ft. Forms groups of 3-7 individuals. Feeds on plankton. Rarely exported through the aquarium trade.
Centropyge multicolor
Centropyge multicolor
multicolor angelfish
Randall & Wass 1974
Occurrence
BPBM 17243 Tahiti: Paea – outside barrier reef; vertical drop-off [Clemens Classen]
Domain: Eukarya
Kingdom: Animalia
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Superclass: Gnathostomata
Subclass: Actinopterygii
Order: Perciformes
Suborder: Percoidei
Family: Pomacanthidae
Subfamily: Pomacanthinae
Genus: Centropyge
Species: multicolor
Notes:
Located in the Central Pacific; Marshall Islands, Marianas, Palau, Society Islands, Fiji, Cook Islands and the Hawaiian Islands.
Max length 9cm. A dwarf angelfish with rich colors. First collected by Clemens Classen in Tahiti in 1974, and then quickly followed by Dr. John Randall at the Majuro Atoll in the Marshall Islands, and then Dr. Gerald Allen only months later at Enewetak Atoll also in the Marshall Islands.
A deep dwelling fish at depths of 65-380 ft. but also on reef drop-offs at shallower depths. Found in groups of 4-10 and by themselves on reef walls. Has been well-cultivated for the aquarium trade.
Further reading
More information on the official taxonomic records for both fish can be found below:
http://www2.bishopmuseum.org/natscidb/
Allen, G. R. 1980. Butterfly and angelfishes of the world.
Further reading on the multicolor angelfish:
‘Two New Pomacanthid Fishes of the Genus Centropyge from Oceania’ in Japanese Journal of Ichthyology Vol. 21, No. 3, 1974.
