Showing posts with label silversides. Show all posts
Showing posts with label silversides. Show all posts

5/20/10

Mangroves on the brain

The island of Bimini and its surrounding tropical waters had lots of amazing habitats and animals to check out. Though we did our fair share of diving around corals, snorkeling through the mangroves was great as well (check out what Jacki and Isaiah had to say about the experience here).

As they floated down the mangrove channel, the teens were able to see the prop roots, mangrove roots that descend down into the water, creating a three dimensional habitat perfect for small fish and serves as a nursery area for such animals like lemon sharks (click here for more on our shark experience).


Prop roots = good homes

These areas are so important because they can provide a great habitat for animals to grow, many of them will leave the mangroves and head to the coral reefs as they get bigger. And we did see lots of animals here. There were schools of small silver fish everywhere, darting out into the channel only to swim back towards the safety of the mangroves if we got too close.



There was also a lot of spotted sea hares, big gigantic underwater slugs, all throughout the channel. They were great to watch...though you needed some time to observe them-they didn't move too fast!



The importance of the mangroves was not lost on the teens. On a section of Bimini's coastline, the mangroves have been removed due to outside development. The teens were constantly reflecting on the destruction they had witnessed and wondered how this could be allowed to happen to such an important habitat. It was great to see and hear this reaction. It's hard to connect with an environment that is far away from home and seems to have no impact on your daily life. But the teens were able to do this--connect in a way that hopefully will have long lasting impacts on their lives. They are the new stewards of this blue planet--this trip has hopefully helped them along the way.

New fans of mangroves

- Jo

2/26/10

#74: Our Reef Residents - Mero the warsaw grouper

One of my favorite reef residents in the GOT is Mero, our warsaw grouper, Epinephelus nigritus. In the 40 years that the GOT has housed fish, this is the only representative of this species to have lived here.



According to fishbase.org, warsaws can reach a length of 230 cm or over 7.5 feet. In our tank, this individual seems to be a slow growing fish. Although we have hosted this fish in the GOT since 1993, it is only about 3 feet long. In comparison, the other large Caribbean grouper species that we have here at the Aquarium, the goliath grouper, seems to grow much faster. It can be found in our Blue Hole exhibit.


Mero loves to eat tiny silversides!

Mero is interesting because he came to us as a Gulf Stream orphan (GSO) at least 18 years ago. Gulf Stream orphans ride the Gulf Stream north from the tropics to New England while still in their microscopic egg or larval stages. At some point they drop out of the stream close to shore and grow into miniature tropical fishes. We start seeing them up north in August. Since these tiny tropical fishes can't swim all the way back down south, they usually succumb to the dropping water temperatures by October. Mero was less than 3 inches when collected and was practically indistinguishable from the baby snowy groupers that are a much more common GSO species. It wasn't until years later that this fish could be recognized as a warsaw and not a snowy.

At a certain size, one way to ID the warsaw grouper is by its extra long second dorsal spine. Here Mero shows off his.




More than any other in the tank this fish loves to be scratched. The divers can make his day by dropping sand onto his skin and into his gills. Mero will open his gill covers wide to encourage this activity.



But what is really happening here? Mero is responding to the touch of the sand the same way he would to the touch of a cleaner fish. Cleaner fish are tiny fish that hang out in particular sections of living coral reefs referred to as cleaning stations. Larger fish like Mero are attracted to these stations. The cleaner fish eat the parasites off of the skin and gills of the larger fish. The cleaner fish get a free meal and the big fish get healthy glowing skin and fresh feeling gills. We don't have tiny cleaners in the GOT but next time you visit the Aquarium you are likely to see this activity with neon gobies involved in cleaning duties on the goliaths in our Blue Hole exhibit. Say hello to Mero while you're here!

-Dan L


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