Home | Aquarium Livestock | Lungfishes – the Natural History and Care of Prehistoric Fishes – Part 1

Lungfishes – the Natural History and Care of Prehistoric Fishes – Part 1

Queensland LungfishHello, Frank Indiviglio here.  I find it quite easy to imagine a Lungfish-like creature pulling itself from an ancient sea, setting off on land and, in the process, changing the course of life on earth.  Indeed, paleontologists believe that a fish very much like today’s Australian Lungfish (Neoceratodus fosteri) pulled off just such a feat during the Devonian Period, some 160 million years ago, and in doing so set the stage for the evolution of all terrestrial vertebrates that followed (talk about “leaving your mark”!). 

Photos showing an African Lungfish being released from a dry mud ball (in The Fishes, part of the wonderful 1960’s Life Nature Library series) hooked me on lungfishes as a boy.  As time went on, I had the good fortune to work with 4 species, and my fascination with them grew.  I recently helped the Maritime Aquarium to acquire a large specimen for their outstanding Africa, From Desert to Sea Exhibit, and was inspired to write a bit about these amazing creatures here.

Fish or Dinosaur?

Occupying 2 families within the order Lepidosiereniformes, the 6 lungfish species that survive today have barely changed over time – today’s Australian Lungfish, for example, would be difficult to distinguish from those that lived 100 million years ago.  Australia and South America are each home to a single species, while Africa boasts 4, including the world’s largest – the massive, 6.5 foot-long East African Lungfish (Protopterus athiopicus).

Lungfishes are believed related to the ocean-dwelling Coelacanth, a true “dinosaur” that lives at depths of 2,300 feet or more.   First seen in 1938, when it surprised fisherman by appearing in a net, the Coelacanth was thought to have become extinct 65 million years ago.

The Animal Kingdom’s First Lung

LungfishThe swim bladder of the lungfish has evolved into a highly efficient, lung-like breathing organ.  By allowing the fishes to use atmospheric oxygen (“breathe air”, as we do) it adapts them well to shallow pools, ditches, swamps and other habitats from which water may disappear during the dry season.

This organ is most highly-developed in the 4 African species, some of which can survive periods of up to 4 years without food or water.  Droughts are spent within a mucus cocoon, with the fish breathing via a small hole at the top of the protective enclosure.

We’ll take a look at Lungfishes in the aquarium in Part 2.  Until then, please write in with your questions and comments. 

 

Thanks, until next time,

Frank Indiviglio

Further Reading

At some point, Lungfish pectoral fins took on a very leg-like form…now paleontologists believe they may have a clue as to just how ancient fishes managed to use their fins to leave the water.  Please see From Fin to Leg for the story.

Excellent Animal Planet Video of African Lungfish in and out of water.

Lungfish image referenced from wikipedia and originally posted by Flickr user Belgianchoclate
Queensland Lungfish image referenced from wikipedia and originally posted by Haplochromis

3 comments

  1. avatar

    Very cool! It’s neat to imagine these guys growing legs and crawling up onto land millions of years ago. Afterall, we all started with gills!

  2. avatar

    Hello Rachel, Frank Indiviglio here.

    Thanks for your interest in our blog.

    I agree, and have always been fascinated by the process; one wonders what lungfish, mudskippers, walking catfishes and others will look like in a few million years!

    Good luck and enjoy; I look forward to hearing from you in the future. Please keep an eye out for Part II of the Lungfish article, which should be posted shortly.

    Best regards, Frank Indiviglio.

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About Frank Indiviglio

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Being born with a deep interest in animals might seem unfortunate for a native Bronxite , but my family encouraged my interest and the menagerie that sprung from it. Jobs with pet stores and importers had me caring for a fantastic assortment of reptiles and amphibians. After a detour as a lawyer, I was hired as a Bronx Zoo animal keeper and was soon caring for gharials, goliath frogs, king cobras and everything in-between. Research has taken me in pursuit of anacondas, Orinoco crocodiles and other animals in locales ranging from Venezuela’s llanos to Tortuguero’s beaches. Now, after 20+ years with the Bronx Zoo, I am a consultant for several zoos and museums. I have spent time in Japan, and often exchange ideas with zoologists there. I have written books on salamanders, geckos and other “herps”, discussed reptile-keeping on television and presented papers at conferences. A Master’s Degree in biology has led to teaching opportunities. My work puts me in contact with thousands of hobbyists keeping an array of pets. Without fail, I have learned much from them and hope, dear readers, that you will be generous in sharing your thoughts on this blog and web site. For a complete biography of my experience click here.