Tag Archives: Cornwall

It’s a fish – day two

Day two of the seasearch course started relatively early (for a Sunday). We met at Towan headland in Newquay by the old lifeboat station, and the car park started to fill with divers in various states of getting ready. Most of the course participants were diving, but three of us (including me) were snorkelling. We accessed the water down a natural rock ramp, which was much less steep than the old lifeboat slipway, and entered the water at 9.30, around two hours after local high water. As I was only wearing a summer 3mm wetsuit the cold shock was a little bracing and left me hyperventilating for a good twenty seconds, as well as giving me the start of a wonderful ‘ice-cream’ headache. Visibility was around 5m as we began to snorkel. We remained on the surface so as not to interfere with the divers surveying below us, which restricted us to observing what was in the water column or on the shallower rocks, and consequently saw mostly sand eels and spider crabs. We were joined by a female grey seal who kept us company for a while before disappearing to visit the divers. As we swam back to the exit point I could see the silhouette of the seal below me, just at the limit of visibility.

Grey Seal
Grey Seal (Halichoerus grypus). CC BY-SA Duncan Greenhill

After coffee and biscuits, we moved across to the other side of Fistral beach as the tide continued to fall to meet Frances and the other participants for the rockpooling session. This was more productive for me personally, catching a large Shanny (Lipophrys pholis, and thanks to Fiona for spotting it), and later a long-spined Sea Scorpion (Taurulus bubalis). The Sea Scorpion was a complete surprise as I ran my hands through the unlikeliest looking crevice in the rock behind where we’d left our bags and found quite a sizeable fish at about 15cm long.

Shanny (Lipophyrys pholis)
Shanny (Lipophyrys pholis). CC BY-SA Duncan Greenhill
Long Spined Sea Scorpion
Long-spined Sea Scorpion (Taurulus bubalis). CC BY-SA Duncan Greenhill

As the tide started to come in we used a seine net to sample over the sand in the surf. It was hard work, and involved coordination so that the top and bottom ropes were hauled in at similar rates, and that the bottom rope was kept low to avoid all the specimens escaping underneath. We found a prawns and shrimps, a juvenile flatfish, and a number of Lesser Weaverfish (Echiichtyhys vipera), which questioned the wisdom of so many swimmers going into the water barefoot. The day ended with pasties on the beach.

Overall, it was a great weekend. I learned a lot, in good company, and hope to return next year to do the seasearch observer course.

Creative Commons Licence
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

It’s a Fish – Day One

Seasearch is a project involving volunteer sports divers to record the habitats and marine life around the coast of the UK. I recently attended one of their training courses (Fish ID) in Newquay Cornwall. The course was organised by the Seasearch Organiser for Cornwall, Cat Wilding, who’s also the marine survey officer for Cornwall Wildlife Trust, and the tutor was Dr Frances Dipper.

The course was being held at Newquay College and after the usual introductions, the day started with a short presentation where Frances talked about some of the main groups and families and the general characteristics of fish that would be used to identify them. In the second presentation, we moved on the fundamentals – the FLEMMS system. The FLEMMS system is designed so that you can gather a lot of information for identification in what may be a relatively short glimpse as the fish disappears into a clump of weed. FLEMMS stands for:

  • Fins, specifically the unpaired fins. How many dorsal? How many ventral? Is the tail concave, convex or straight?
  • Lateral line. Is it visible in that particular species? If so, is it straight or curved?
  • Eyes. Where are they positioned? Are they large or small? Are they bulging?
  • Mouth. Where is it positioned? Is one of the lips prominent or are the lips equal? Are there any barbels?
  • Markings. Are there any distinctive patterns, colours or spots?
  • Size. Relate the size to something more general: is it finger, hand or arm size?

We then got to practise and started with the easy option – identifying fish from photographs, although as we progressed Frances would mimic the fish disappearing by changing the slides faster. We could either make quick notes about features or make a quick diagram. I chose the diagram method. It starts with a cross to represent the fish onto which we mark the fins, lateral line, eyes, mouth details, etc. The symbols aren’t standardised since it’s an aide to our memory for identification after returning to shore, rather than a reference for others, so we might use lines or shapes for fins.

FLEMMS diagram of a haddock (Melanogrammus aeglefinus)
FLEMMS diagram of a haddock (Melanogrammus aeglefinus)

This fish has three dorsal (the first prominent) and two ventral fins which, in UK waters, shows that it is a member of the cod family. There is a curved lateral line, the upper jaw extends below the lower jaw, which has a small barbel. There is a black marking just below the lateral line. The combination of the first dorsal fin and the black ‘thumbprint’ shows that this is a Haddock (Melanogrammus aeglefinus).

FLEMMS diagram of a Shanny (Lipophyrys pholis)
FLEMMS diagram of a Shanny (Lipophyrys pholis)

This is a fish with a long single dorsal fin and a single ventral fin. The tail is convex. The head is complex, with prominent bulging eyes, and thick lips with the upper lips horizontal and slightly protruding over the lower lips. The fish is around hand size with blotchy markings. The single dorsal fin and the lack of head tentacles identifies this as a Shanny (Lipophyrys pholis).

After lunch, we went to the Blue Reef Aquarium to practise on more mobile and less cooperative fish, which included blennies, gobies, wrasse, and skates and rays.

Tompot Blenny (Parablennius gattorugine)
Tompot Blenny (Parablennius gattorugine)
CC BY-SA Duncan Greenhill

We returned to the lab at Cornwall College and had another brief presentation on some of the difficulties and confusions we might face trying to identify fish such as fish keeping fins folded down (which causes us to miscount), and changes in colouration and pattern as the fish matures or changes sex. There was a perfect end to the day with a course meal looking out over the clifftop across Great Western Beach as the surf rolled in and we wondered about conditions for the following morning.

Creative Commons Licence
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.