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8 Fun Facts about Blennies

By Scuba Diving Editors | Published On January 31, 2017
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8 Fun Facts about Blennies

tube blenny in its coral burrow

A colorful tube blenny peeks out from its coral burrow. Blennies are often territorial and like to hide in home burrows or crevices.

Shutterstock/Luiz A. Rocha

What scuba diver doesn't love spotting a blenny in its coral burrow? They are adorable, colorful and wonderfully diverse. Here are eight facts about them.

1. Blenny is the common name of various species of extremely numerous small fishes belonging to the suborders Blennioidei (blennies) and Notothenioidei (Antarctic blennies). There are hundreds of species of blennies.

2. Blennies are mostly small and have elongated, tapering bodies and a continuous long dorsal fin.

3. Where can you find them? They are generally reclusive. Look closely for them on the ocean floor, on reefs, rocks or kelp, in burrows or mollusc shells (sometimes even in discarded bottles), or in eelgrass or algae in shallow brackish water. Some species are found in freshwater and in tidepools.

4. Blennies feed on small invertebrates, though some are herbivorous.


Abimael Marquez won first place in our 2015 photo contest in the Compact Camera category with this photograph of a blenny, taken in Puerto Rico.


5. Some blennies have scales and some do not; some have fleshy filaments on the head. These often elaborate whisker-like structures are called cirri.

6. Bennies are somewhat similar to gibes and dragonets, which are sometimes mistakenly labeled as blennies.

7. The rockskipper (Istiblennius zebra) is a small Hawaiian amphibious blenny that lives along the shore and can twist and hop to propel itself onto land.

8. Blennies have varying temperaments, from calm to aggressive. The Hawaiian Runula goslinei and the Pacific R. tapeinosoma, both of which are small but are not afraid to attack a swimmer or diver by biting them.


NED AND ANNA DELOACH WRITE THE BLENNY WATCHER BLOG, A WONDERFUL COMPENDIUM OF STORIES, FACTS AND PHOTOS ABOUT BLENNIES, AMONG OTHER MARINE LIFE OBSERVATIONS.