This pesky velvet swimming crab keeps creeping into my crevice home when I’m out searching for food. He doesn’t seem to get the message that he isn’t welcome, so I have to deal with him every time I get home. It takes a full blown head on barge, followed by careful manoeuvring to avoid his sharp claws. I then back in beside him and forcibly shove him sideways out of my crevice. As you can see from the video, I’ve nearly succeeded. It’s an uneasy truce for now but I’ll have another bash later!
I use a different technique to shift edible crabs from my territory, please take a look at my blog of 19th June 2015.
Talking of marauding predators, I watched this cuttlefish cautiously from the safety of my crevice home. It grabbed a small fish with its long tentacles and I wondered who had been the unlucky victim. Before the cuttlefish jetted away, I saw a sea scorpion’s tail sticking out from its tentacles. That fish’s camouflage hadn’t deceived the superb vision of the cuttlefish this time, with fatal consequences! Sad to see I guess, but cuttlefish have to eat and better a sea scorpion than a tompot blenny, especially as sea scorpions can eat young tompot blennies too.
You’ve seen how my amazing my babies were swimming around in the plankton. The ones that managed to avoid being eaten and found enough plankton to eat have grown to around 2 cm long and have now settled back on the reef. The researchers are not sure how they find a good home reef. It may just be luck or something to do with them being able to recognise the smell of the area they hatched from. Some coral reef fish know which reef is home from the sound the waves make!
When my babies first settle they are quite colourless, but soon take on camouflage colours to help them match their surroundings. You can see that their head tentacles have started growing and their pectoral fins are just visible with some black pigment.
Thank you to the National Marine Aquarium Plymouth for their help in getting this photo. The NMA is an excellent place to see tompot blennies like Benny the Blenny and lots of other UK marine life.
Hey, this shows what my tompot blenny babies look like when they have left home, having hatched from those eggs that I’ve been guarding. Swimming among the plankton in the open sea, they are very sleek with gorgeous big eyes and are between 4 and 20 mm long.
When they first hatch they eat very small plant (phyto-) plankton and animal (zoo-) plankton, the youngsters grow quickly and are then able to eat larger plankton. Bigger fish larvae and jellyfish in the plankton are a real danger and my babies have to make smart evasive moves if they see they are about to be grabbed!
If you would like to find out more about plankton visit:
This photo was made possible by the National Marine Aquarium in Plymouth so many thanks to them. Paul, my underwater photographer, would never be able to spot and photograph one of my babies in the wild!
One of the tompot blennies living on a reef nearby recently came to a grizzly end in the mouth of this young conger eel. I don’t think it would have happened to me because, unlike this poor guy’s home, my crevice has a ‘bolt hole’. Let me explain what I mean by this; an ideal crevice home has a fairly open front part where female tompots can be entertained and encouraged to lay their eggs but it also has a very narrow back part where you can hide when a streamlined predator like a conger eel pays a visit. This ‘bolt hole’ also gives extra shelter when the sea is very rough.
Having said all that, this poor tompot blenny was very unlucky to meet a conger eel that was just small enough to get into his home and just large enough to eat him. You can see what a struggle it was for the conger in the first photograph. Paul, my underwater photographer, saw the tompot blenny stuck in the conger’s mouth like that for over 30 minutes! When Paul and Teresa came back 12 hours later, they found a very sleepy full-bellied conger eel and no tompot blenny!
This blog is being posted for children on the Wildlife Trusts Wildlife Watch website.
For the first few weeks that I was looking after my growing raft of eggs, the view from my crevice home was stunning. I could see all the snakelocks anemones and thongweed gently swaying in the swell and several ballan wrasse (like the large fish in the photo) cruising around looking for crabs.
It’s a good thing I got my crevice home clean and ready for my female visitors. Just before Easter, a female that we now call Betty came to visit me and she laid a beautiful raft of eggs for me to look after. You can see me in the background of these photographs. The female tompot blennies tend to be paler than the darker more reddish coloured breeding males. In the bottom photograph, Betty is in the middle of laying her eggs and her ovipositor (egg laying organ) is showing.
Teresa and Paul came diving to visit us and were pleased to see that we had started to breed. Storm Katie came through a couple of days later so they are not sure whether Betty’s eggs have survived the storm. In any case, I’ll be trying to attract several other female tompots to visit me over the next two months to lay their eggs. Hopefully the weather will improve, so it will be easier for me to be ready for them!
When I have eggs to look after, I wipe them over with my special glands (that look like miniature cauliflowers) to keep them clean, healthy and free of bugs.
As soon as the sea is calm enough, Teresa and Paul will come and see me again and will be able to let you know how we are all doing.
Yes, I’m back in control of my territory again. My crevice will continue to be a safe home and give me good protection during the storms that are due soon. Winter is definitely on its way with the water temperature dropping down to 14C (it was 16C at its warmest) and the days getting shorter.
Hmm, take a look at the photo, there is a topknot on the rock above my head that’s been hanging around since the summer. I’m never quite sure of its intentions, as you can see I’m wary and keep out of its way. Hopefully, it will move into deeper water for the winter, like many fish, while I stick around here on my home reef.
A topknot is a flatfish that is adapted to live on rocks, it spends the most of its time upside down and holds on to the rock using specially formed fins. I always think topknots are a bit mysterious but the very young tompot blennies have much more to fear because they are just the right size for a topknot ‘snack’. If a big one tried to attack me, I’d stick my fins out and make myself too large and prickly to eat!
I’m thinking about my babies (tompot blenny larvae) swimming, eating and developing in the plankton, I hope they are OK.
It reminded me of this excellent video called ‘The Power of Plankton’ from SAHFOS* which promotes the importance of plankton – the amazing drifting part of my underwater world.
Did you know that the PLANT PLANKTON (phytoplankton) PRODUCES almost 50% of the WORLD’S OXYGEN? That’s one of the reasons why caring for our seas is so important!
By watching the video I also learnt that my babies are classed as MEROPLANKTON, along with the eggs, larvae and juveniles of many different types of fish. This also includes the young stages of other marine animals such as barnacles, crabs, starfish and sea anemones.
You can watch this video and learn all about these things for yourself here: wtru.st
Many thanks to SAHFOS *Sir Alister Hardy Foundation for Ocean Science www.sahfos.ac.uk for producing ‘The Power of the Plankton’ video.