St. Agnes

I did a little ‘recon’ last Sunday in beautiful St. Agnes on the north coast but my timing was a bit off (the tide came in, with sediment getting suspended and the water becoming super-oxygenated, resulting in lots of bubbles on the wetlens). Luckily, this Thursday with no wind, the sun out and low tide, I had the opportunity to nip out again: awesome! Trevaunance Cove has a small beach, with rock pools on either side, I chose the Trevellas Cove side. Coincidentally, Shoresearch Cornwall (facebook here and here) had a survey and so caught up with Matt and Adele as well as Thomas from HydroMotion Media who I had not seen in a while. The north coast is quite different from the south coast I am used too: more exposed and this site for instance had none of the long Thong weed and Wireweed which dominate Castle Beach. The pools are also wider and in parts have a rocky, gravelly or sandy bottom. One spot had a considerable rock overhang, and I probably spent a full hour alone just at these six meters or so as there was so much to see. With the tide out, it was only about half a meter deep, with rocks encrusted in purple corraline algae, pink and orange sponges, bryozoans, tunicates and red seaweeds. The over-under shot is not particularly great but gives a rough impression, as do the two underwater shots (note the mysis shrimp in the last photo): There is a great diversity in red seaweeds, but I find these species quite hard to ID. The red rags Dilsea carnosa look pretty ‘ragged’ in Falmouth at the moment, but in this shaded, high wave energy spot they looked very fresh (first photo). I made a lot more photos but I was really struggling, as the bright sun reflected on the sand, with the seaweeds sticking out from the shaded overhang, such as Sea beach Delesseria sanguinea. The third photo give a good impression of the beauty of this habitat. Black scour weed and Discoid fork weed manage to scrape around in the shifting sands. Serrated wrack hangs and drips from the rocks into the pools below.Apart from the mysis shrimp in the water column, very large prawns patrol the rock surfaces and Edible crabs, Velvet crabs and Spiny squat lobsters hide in crevices. The prawns are curious and really beautiful. Most spectacularly, I found a large lobster in a cavity and at one point had a small lobster walking over to me: Many fish could be spotted as well: Topknots are common (you can just about see one glued to the rocks behind the lobster in the photo above) and there were a couple of big fat Tompot blennies around as well. Dragonets patrol the sand and are very well camouflaged (and hard to approach). A juvenile fish was hiding on and in a sponge; I first thought it was a juvenile Black-faced blenny Tripterygion delaisi, but in subsequent facebook correspondence thought of a Montagu’s blenny Coryphoblennius galerita (very common here) but then settled on a little Tompot blenny Parablennius gattorugine. This would have been a very good subject for a proper macro-shot if only I could get to grips with my strobe! In general this was a great place and time for fish. Apart from the topknots, tompots and Montagu’s blennies (juveniles were abundant, present even in the tiniest pools), I saw sand eels, corkwing wrasse, a pollack and horse mackerel (both a bit lost in these shallow pools), corkwing wrasse, shannies, sand gobies and rock gobies. I thought I spotted a Giant goby, but this turned out to be a very large rock goby Gobius paganellus (thanks Matt Slater). After the large goby photo, a tiny Rock goby (I think), a Shanny, a Cushion star and Snakelocks anemones. I cannot wait to get back to this beautiful site, but will need to wait a bit for the next good tide…

First proper snorkel session of the year

GyllingvaseThis Thursday was only sunny, but also not windy, with a good low tide in the early afternoon, which meant I reserved a few hours to go to Tunnel/Castle/Gylly beach for some snorkelling. The photo above shows Gylly Beach, with the start of Swanpool lagoon behind it and the Lizard in the far distance. (I took this with my iPhone using a Hipstamatic filter; for more iPhone pics of Cornwall see cornwall_hipsta on instagram…). The water temperature was OK (9C?) but the viz was not as good as I hoped. The seaweeds are at their peak now and the pools looked very pretty. Not many fish, but I saw a small brown thing floating around which I first thought was Sea hare, but turned out to be a small (perhaps a Connemara) clingfish lazing about until it noticed me and bolted into the seaweeds. I carefully snorkelled in about half a meter of water, admiring the views and trying to take photos close-up (as the viz was not too good) with my wide angle wetlens. Below an above-water shot of some iridescent Bushy rainbow wrack Cystoseira tamariscifolia and the invasive red Bonnemaisonia hamifera (on the left). I need to go back studying photography basics. A main challenge is contrast. The pools have beautiful white sand, which result in hugely overexposed photos (or completely darkened subjects). I have come up with my own law, the Photography Frustration Index (PFI): the beauty of the subject (B) x the difficulty of capturing it (D). The PFI is very high in the case of seaweeds! Next: Bushy rainbow wrack under Thong weed, Purple claw weed Cystoclonium purpureum, Bushy berry wrack Cystoseira nodulosum covered with the epiphytes Asparagopsis (left) and Bonnemaisonia (right), Hairy sand weed Cladostephus spongiosus, Black scour weed Ahnfeltia plicata (you can see they grow in the sand and must be used to scouring) a ‘bouquet’ of different species (with a snakelocks anemone) and a last photo of a variety of species, including the common False eyelash weed Calliblepharis jubata. The tides and weather conditions are unfavourable the coming days but I hope to go snorkeling again end of the week!IMG_9393

Raglans Reef

It has been a long time coming, but I finally managed to go on a boatdive to the Manacles this weekend. I rented my gear at Seaways in Penryn and got on board the Atlantic Scuba rib ‘Stingray’ in Mylor Marina. Nine divers were on board; I was teaming up with Thomas and his intern Andy from HydroMotionMedia (make sure to check out the revamped website), who are working on a documentary about Marine Conservation Zones (the Manacles are one). The Manacles are a group of rocks east of the Lizard peninsula about half an hour by boat from Mylor which historically have claimed many ship wrecks, and they form one of the best dive sites in the UK. The name is an anglicization from the Cornish ‘Meyn Eglos’, meaning church stones. It was a beautiful sunny morning, and when we were close we spotted several Common dolphins Delphinus delphis, who came up to the boat, an awesome start! At slack tide, we descended to about 18 meters to inspect the walls of Raglans reef, the outermost pinnacle of the Manacles group. For the first time, I saw many of the species I was familiar with only from the internet and books with my own eyes: Cuckoo wrasse, Dead men’s fingers (a soft coral), Ross coral (which is not a coral but a Bryozoan), enormous amounts of Feather stars (see this recent post when I found them first on holiday in France), Sun stars and of course the incredibly pretty Jewel anemones Corynactis viridis:The photos are OK but I could do a lot better, this was in part due to my camera malfunctioning for a bit and my dive was pretty short anyway, as I guzzled too much air (I need to do some sports and drink less beer!). Also, I need a lot more practice with video light and strobe. However, this dive was primarily about checking out the new scenery.  Some shots of other species below: the Edible sea urchin Echinus esculentus, Elegant anemone Sagartia elegans (variety rosea) and Dead men’s fingers Alcyonium digitatum. I hope to go back to the Manacles on the Stingray very soon!

Falmouth Seaweeds July

Last week I went for a little swim at the usual spot at Castle Beach. The viz was nowhere near as good as last month, but still OK. There are schools of sand eels and sand smelt and I even saw an eel. The contrast between growing brown seaweeds and withering red seaweeds has become even greater. Below you see some yellowed Harpoonweed and a ‘forest’ of Thong weed covered in epiphytes. As the light was a bit subdued, I focused on the most shallow area. The bare parts of the rock are covered with barnacles, dog whelks, sting winkles and limpets. The seaweeds are mainly Serrated wrack Fucus serratus, Sea lettuce Ulva, Grape pip weed Mastocarpus stellatus, some Ceramium and Laver Palmaria palmata, as well as Dumont’s tubular weed Dumontia contorta.

Some Red Seaweeds

Last weekend I took a little stroll on my local beach in Flushing and had a quick look at the variety of red seaweeds washed ashore. I saw some that I did not know, some that I knew, and some that I thought I knew….
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I have recently joined the facebook group ‘Seaweeds of the NE Atlantic‘ and so immediately asked the experts for some help in identification. It turned out that the only one I correctly identified was the one on the bottom right: Solier’s red string weed Soliera chordalis. This (invasive) species did well in the aquarium and so did the one on the top right, which I always thought was Dudresnay’s whorled weed Dudresnaya verticillata but it isn’t! It is actually Chrysymenia wrightii, which is also an invasive species. Moreover, my ID of the bottom left species was also wrong: not Fine-veined crinkle weed Cryptopleura ramosa but Beautiful fan weed Callophyllis laciniata (I should have known this as I have found crinkle weed in France this year…). The small flat seaweed on top is Cock’s comb Plocamium cartilagineum. The dark mop top left could not be identified based on this picture so I have to go back to take a better one. So dear reader be warned and take my identification of seaweeds in previous posts with a grain of (sea)salt!

st. agnes

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Last Sunday I ventured to the north coast for a rock pool ramble with Matt Slater of the Cornwall Wildlife Trust (see this great blog) and the local marine conservation group (who also have a nice blog). I actually had never rock pooled at the north coast before (shame on me) and so it was nice to see this exposed habitat, quite different from my main haunts at Castle Beach in Falmouth and Trefusis Point in Flushing:

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The rocks were much more bare and the number of animals a lot lower. However, there were quite some seaweeds. I finally saw (the edible) Laver Porphyra spp (probably Black laver Porphyra dioica):

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Another edible species, Dulse Palmaria palmata, was incredibly common here:

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I won’t add too many seaweed pics in this post, but I liked this shot of Serrated wrack Fucus serratus:

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Brown and yellow Flat periwinkles Littorina obtusata (or possibly Littorina mariae, I did not bother to check) where common:

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We found a Shore cling fish Lepadogaster lepadogaster and a Five-bearded rockling Ciliata mustela:

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I found a couple of pieces of a branched seaweed covered in the bryozoan Electra pilosa:

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All in all a good session. I hope to go back soon to take better pictures of the seaweeds!

Prussia Cove

We went to check out Prussia Cove (named after ‘the king of Prussia’ John Carter who used it as his smuggling base in the 18th century) this weekend for some snorkeling action:

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The weather was great but there was quite a lot of wind and so the water was choppy and the visibility really bad. We saw hardly any fish. The seaweeds consisted mainly of the common Thong weed Himanthalia elongata and Bushy berry wrack Cystoseira baccata. There were not many rock pools. The only interesting find there was the pretty Brown tuning fork weed Bifurcaria bifurcata:

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