This Sunday we went on a lovely walk from Helford Village to St. Anthony in Meneage on the south coast of the Helford river. The tide was very low, so we decided to follow the mud flats for a bit before heading to the woodlands. The mud flats are a brown-grey and strewn with shells, pebbels and, unfortunately, litter. Not as pretty as the rock pools, but still interesting. There were small banks with mussels, cockels, slipper limpets and oysters, both the native oyster Ostrea edulis (quite some juveniles) as well as the invasive Pacific (or Portuguese) oyster Magallana gigas. Of course also the abundant, barnacle-covered periwinkles Littorina litorea. I saw my first Auger shell Turritella communis (which does not reflect rarity at all, just the fact that I usually stick to rocky shores); the small shells around it are Needle whelks Bittium reticulatum. Finally a Chinaman’s hat (probably no longer the prefered nomenclature!?) Calyptraea chinensis.We met up with David Fenwick and partner-in-crime Carol who were busy sampling around Treath. David’s interest was caught by a mooring rope covered in seasquirts, and a boxful was collected for careful examination under the microscope later. The clump I am holding below shows the Compass seasquirt Asterocarpa humilis (red, middle) (invasive), Morchellium argus (orange, top) (native), the Dirty seasquirt Ascidiella aspersa (three grey ones) (native) and the Creeping seasquirt Perophora japonica (tiny yellow zoids connected by stolons growing over the Ascidiella) (invasive). Astonishingly, by the next day, in a single tupperware box filled with muddy seasquirts, David had found 70 species! (With 142 species recorded in total on the day.) To finish this post full of grey blobs and brownish molluscs, I am adding photos David made of four out of nine species of Heterobranchs (Nudibranchs ‘proper’ as well as Ophistobranchs) present in the sample. Stunning images and proof that there is tremendous biodiversity to be found on a muddy bank if you know how to look for it. More of David’s nudibranch work is featured in this old post. See for his continously expanding collection of images, from seaweeds to fish and from tiny marine fungi to stranded seaturtles, aphotomarine.com.
Tag Archives: Helford
A Seagrass dive with the Canon G16
It was a glorious bank holiday morning today and high time for another dive before the season is over. This was a dive just by myself; I had never done that before and I kept it very easy with a maximum depth of 5 meters so could surface with two kicks if needed (it was low tide so I needed to go less deep to begin with). I chose the eelgrass beds of the Helford river to play around with my new camera, a very different habitat than last weeks Maerl dive In the Fal estuary. Unfortunately no catsharks or thornback rays this time, but there were some nice invertebrates to practice on (I did not bother with the fish, way too difficult). Although I still have a long way to go to get anywhere near the quality of some of the photo’s I see on various facebook groups and blogs, it is definitely a lot easier to take good pictures with my new camera. Compare for instance the photo of a Necklace shell Euspira catena below with that of a pic taken with my old camera. Next, two very different molluscs: the Hard-shell clam Mercenaria mercenaria (introduced from North America, there called ‘Quahog’) and the Sea hare Aplysia punctata. The latter can be abundant but it is rare at the moment. The one I saw was not the usual brown but very pale, I have no idea how uncommon this colouration is. Hermit crabs are always common here however. Some of these belong to the species Pagurus prideaux, as the shell they inhabit is covered in the Cloak anemone Adamsia palliata (creamy with purple spots on the left of the shell, need to take some close-ups of that one next time). One crab was covered in the thin, white acontia threads of its anemone, which it might have induced from its partner for defence. The last photo is of the Football jersey worm Tubulanus annulatus, a very distinctive nemertean worm that I could easily identify through the excellent aphotomarine website. Now I need to get serious about the camera settings and practice, practice, practice…
It has become almost a tradition to go for a dive at Silver Steps (rocky coast) one day and at Helford (eelgrass beds) the next (I rent my equipment for 24 hours, I could squeeze in a third dive maybe but I never really have time for that). So following the Silver Steps dive featured in the previous post, here the Helford one. We found many of the same creatures as described in recent Helford post so I will not get into these. Worth mentioning was the beautiful nudibranch Facelina bostoniensis, but I did not get a shot in focus unfortunately. The highlight of the dive was a Small-spotted catshark Scyliorhinus canicula, around 60-70 cm in length. Very pretty and very easy to approach, I was able to shove my camera almost up its nose!