Surprise beautiful blue eggs!
It all begins under the water…
What are they? Click on the below photos to see all the little details.
Eunicid Polychaete (worm) & its eggs
Coral Spawning is one big eating fest, you never know what you are going to discover. While I was watching the Smooth Flower Coral (Eusmilia fastigiata) spawning, I noticed that there was a small blueish mass on a couple of the polyps. Some close up shots later revealed that a Eunicid Polychaete (worm) was being eaten by the spawning Smooth Flower Coral! There are two coral polyps and the worm seems to be stretched out between them along with its beautiful blue eggs. It seems that the two polyps are competing to see which one is going to get to eat the worm and its eggs. The one on the left seems to be winning! Notice how the worm and eggs are inside its polyp.
The line of black dots are eyespots of the ‘epitoke’ (reproductive phase of the worm), these appear on each side of the body and this is only during the epitoke phase, the adult worm does not have these rows of eyespots. Apparently, epitokes can often be eaten up corals and other little creatures. The eggs start off being internal but then the worm will swim up to the water column to release the eggs or the sperm. (Many thanks to Leslie H. Harris for providing this information). Amazing nature!
FLAME BOX crab being stalked
It all begins under the water…
Box crabs (Calappidae) mainly hunt by digging in the sand and rubble to find marine mollusks which they can then crack open with their powerful claw. In Bonaire, you can typically see a Flame Box crab (Calappa flammea) walking around in the shallow sand. If they are threatened, they can easily dig themselves into the sand and burrow there with only their little eyes protruding until the threat is gone.
While the crab goes about its business walking around and digging in the sand, it attracts some followers that would like to benefit from this behavior. In several instances, I have observed this situation: A wrasse or a flounder will follow the crab hoping to benefit from the hunting that it does so that as the little bits and pieces of mollusks that the crab digs up surface, the fish can also get their share of the action and have a free meal.
There was no indication that the crab was bothered by its stalkers or any indication that the fish tried to grab the crab’s food. The wrasse was a bit more intrusive in its stalking behavior which seemed to halt the crab a bit though.
These observations I had along with the videos I have shot lead to a co-authored paper with Werner de Grier that was published in The Ecological Society of America in April 2020. You can read it here: https://esajournals.onlinelibrary.wiley.com/doi/full/10.1002/ecy.3068
Below are the 2 videos that show the behavior:
1) One where the crab is being followed by a Slippery Dick wrasse (Halichoeres bivitattus)
2) Another by a Maculated Flounder (Bothus maculiferus).
MASBANGO
It all begins with a dark cloud that descends upon the reef…
Masbango and the Crevalle Jack - The Chase:
Bonaire is a small island in the South Caribbean and its waters are visited by schools of big-eye scad, or as the locals call it “Masbango”, few times a year. This is an exciting time for fishermen as well as divers. While it is a traditional food source for Bonairean people, divers prefer not to see them in nets. The school of fish, also referred to as "bait ball", is a wonderful sight to behold as a dark cloud of fish descends upon you. This cloud is often dispersed by its own set of predator fish, mostly jacks, sometimes barracuda.
The first time I came upon a bait ball I was not aware of it at all. As usual I was head down taking the photo of a juvenile fish that was waaay in the crevice of a coral head. I was at about 70ft and totally concentrated at my wonderful find and how to capture a good macro shot. I started feeling the presence of something behind me as well as a darkness that descended… It seemed like a good idea to turn around and see what is behind me. Lo and behold, there was a massive and dense school of fish right behind me that extended from the reef to the deep blue!!! I was ecstatic. I spent all the rest of my time capturing the Masbango and the Crevalle Jack that lunged at it frequently dispersing the crowd. I was in heaven. It was just me and this gigantic school of fish and the Crevalle jack for what seemed like a very short time though it was at least 40min.
You can find the photo series for this experience here and the Masbango video here.
In this photo series a crevalle jack hunts for its meal. As the jack dashes into the bait ball, the fish scurry away in an amazingly uniform fashion, creating a hole in the middle of the bait ball. The jack makes several passes and then takes off. The little specks of dark below the bait ball seen in some of the photos are the poop of the fish.
It all begins under the water…