castle beach

Although cold and rainy on the bank holiday Monday, the weekend weather was glorious (and low tide was ‘low’), so it was off to Castle Beach in Falmouth:

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To me this looks as good as a coral reef! Loads of Harpoon weed Asparagopsis armata, Thong weed Himanthalia elongata and Oarweed or Tangle Laminaria digitata (there are two similar kelp species, but these remain more erect when above water my guide tells me). Also quite some of my favorite Bushy rainbow wrack Cystoseira tamariscifolia shining blue:

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Also iridescent: a tiny (<5 mm) Blue-rayed limpet Helcion pellucidum. Normally found on Laminaria kelp, this one sat under a rock:

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Especially on the middle shore, there was quite some change in seaweed composition, with lots of Ulva and similarly bright green, slimey algae in the rock pools. The abundant Shore clingfish Lepadogaster lepadogaster had been laying eggs under rocks everywhere:

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You can even see the embryo eyes, I am very happy with my olloclip macrolens (although photography in the bright sun is difficult, especially if you do not want to disturb the animals/eggs too much). There were a couple of quite big Edible crabs Cancer pagurus around. The combination of a trembling crab and a trembling hand resulted in a sub-optimal macro photo of its carapace but it is still a neat pattern:

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Strangely (and mostly, annoyingly), the second pump of the aquarium broke down before the weekend and I ordered two new ones. The aquarium has not improved without filtration of course. I will be traveling quite a bit over summer so I will not experiment much with it in the near future.

new lighting

My new 55 watt fluorescent Philips daylight lamps arrived last week. The first picture shows the two standard 10.000 K actinic lamps that come with the Red Sea Max 130D; the second picture shows the two new daylight lamps. I found he light coming from the actinic lamps always looking rather harsh, but the daylight lamps looked awfully yellow. I decided to compromise between photosynthesis and aesthetics and go for one of each type (third picture):

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As you can see, the Wireweed and Dudresnays whorled weed are doing very well.

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The 10.000 K lamp (top) and the 6500 K lamp. Contrary to my expectation, the temperature dropped using the new lighting: from 25C to 23C, good! I have ‘planted’ some Furcellaria lumbricalis, let’s see what it does:


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Yesterday I discovered a big patch of Bushy rainbow wrack Cystoseira tamariscifolia on Castle beach in Falmouth (I noticed that this seaweed grows quite high on the shore at this location). I should have brought a small plant back to test with the new lighting (and lower temperature and salinity) but I reckoned it would be best to wait a bit until I have a chiller as well to get all conditions right. Hmmm, maybe I’ll go back today…

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