Moon Jellyfish (Aurelia aurita)
Sadly, our Moon jellyfish have all fallen victim to the increased water temperatures and reduced water flow this month. We had previously seen that jellyfish are very sensitive to adverse environmental changes.
Our jelly fish polyps, however, have shown a marked improvement. We relocated the Kreisel tank into the Fish Lab to provide better air temperatures, and have increased the feed to 500ml of S-Presso enriched artemia (day 2). This has improved the number and condition of the polyps, with a healthy orange hue and widespread attachment.
The reduced water flow (to lower running costs) has affected our large marine aquarium. The resulting lower oxygen levels and seasonally warmer water temperatures have combined to prove fatal to many of our marine inhabitants. We have replaced some of the lost herbivores, but the resultant algal overgrowth will take some time to restabilise.
- Zebra dart goby (Ptereleotris zebra) – reach a size of 12cm. They are fast active fish, that stay close to their hiding spot for if they feel threatened by larger individuals.
- Yellow tail basslet (Pseudanthias evansi) – schooling fish usually found in the upper edge of drop-offs. They feed near the surface, away from the reef and are easily overlooked due to their size and colour.
- Clark’s anemonefish (Amphiprion clarkii) – added from our breeding stock. It took a few days for the pair to become comfortable in their anemone.
The mini-frame coral fragments have started to grow and encrust, although there are signs of bleaching due to the warmer waters (monthly average of 31°C). To reduce the tank temperature, we have started experimenting with the introduction of ice during the morning (the air conditioning cools in the evening).
The following specimens have been relocated to our large aquarium:
- Banded Coral Shrimp – where it might provide a ‘cleaning station’ to the fish inhabitants.
- Juvenile Rock Lobster – very healthy and continuing to grow at a good rate (2 moults in April).