Feeding Frenzy

With my face behind the camera, and looking the other direction, I did not notice the commotion I had caused. A swirl of colorful motion caught the corner of my eye. I turned to see a horde of butterflyfish attacking a seemingly uninteresting rock face. I watched for a moment before a memory triggered… Of course!

Feeding Frenzy
A mixed school of butterflyfish feeding on the eggs of a Hawaiian Sergeant Abudefduf abdominalis
I knew what to look for… Sure enough, a barred fish darted into the crowd, aggressively driving off a few members of the swarm. But for each fish driven off another two would sweep in behind to peck at the rock face.

It is likely the gang of butterflyfish used my presence as an opening to overwhelm the Sergent. Local lore is full of examples of this behavior. The passage of a larger predatory fish, or a diver, will give the guarding male Sergeant a pause. A slim opening upon which the gang will swarm the eggs and feed. During Sergent breeding season it is not unusual for divers to mention schools of butterflyfish or tangs following them in and around the nesting areas.

Sergeant Eggs
Eggs of the Hawaiian Sergeant (Abudefduf abdominalis) covering a one meter area
With the feeding fish so oblivious to my presence I took advantage of the situation to blaze away with the camera at short range. The were a couple species here that I did not have decent photos of.

I literally have to push my way through the swirling fish to examine the nest. The rock is covered with eggs, an amazing number of little purple dots covering an area of about a meter square. Despite the ongoing feeding frenzy, the nest seems intact, with nearly every bit of the rock covered with the neat little lines of eggs.

Hoover1 makes an interesting observation… “One can only wonder why Sergent eggs are so conspicuous while most damselfish eggs are hardly visible”

1) Hawaiian Reef Fishes, John P. Hoover, Mutual Publishing, 2008

Author: Andrew

An electrical engineer, amateur astronomer, and diver, living and working on the island of Hawaiʻi.

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