Do Jellyfish cause echo sounder problems

LONG_KEELER

LONG_KEELER

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On the tropical East Coast of the UK , I've noticed spike readings on the echo sounder.

Could these be caused by jellyfish ? Or perhaps all the bloom growing on the mud ?

Also, have you had a swim yet and do jellyfish sting much ? I'm tempted.
 
LONG_KEELER said:
On the tropical East Coast of the UK , I've noticed spike readings on the echo sounder.

Could these be caused by jellyfish ? Or perhaps all the bloom growing on the mud ?

Also, have you had a swim yet and do jellyfish sting much ? I'm tempted.
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More likely fish, I'd have thought. Air (in their swim bladders which most fish possess) gives an excellent reflection. That's how fishfinders work.

As to sting -- depends on the species. Best to avoid all of them if you can.
 
I was stung by a jelly fish in Thailand and it was 100 times worse than stinging nettles. It felt as though I had burned my arm and on the grill element of the oven and it wet on burning! Eventually, I had to get cortisone cream for it and even after that, the skin my arm remained raised and sore for bout 3 weeks! It was all my OH's fault too because I told him to watch out for jellyfish, whilst I took a quick dip and he neglected to tell me about the one that had just swum under the boat. I made him go ashore to look for sting cream and had some satisfaction, that on the return trip, he ran out of fuel for the tender and had to paddle all the way back.
 
All (?) jellyfish sting, but the effect of that sting on humans varies greatly from specie to specie.

To quote Wikipedia:

Most jellyfish stings are not deadly
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.... Very reassuring that. :eek:

sting effects range from no effect to extreme pain to death. Even beached and dying jellyfish can still sting when touched.
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So you need to know which jellyfish you are dealing with. I understand moon jellyfish (common in UK waters) are ok. Lion's mane - you see a lot of them on the west coast of Norway - are not.

Time to buy a jellyfish identification book or have a jellyfish spotter keeping an eye out for you.
 
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Angele said:
All (?) jellyfish sting, but the effect of that sting on humans varies greatly from specie to specie.

To quote Wikipedia:



.... Very reassuring that. :eek:



So you need to know which jellyfish you are dealing with. I understand moon jellyfish are ok. Lion's mane - you see a lot of them on the west coast of Norway - are not.

Time to buy a jellyfish identification book or have a jellyfish spotter keeping an eye out for you.
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Lion's Mane is also found in the UK. In fact there's a Sherlock Holmes story about it, though it does exaggerate the likely effects.
 
AntarcticPilot said:
Lion's Mane is also found in the UK.
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Yes, but much rarer than Moon (and Blue and Barrel) Jellyfish in these waters. Whereas in Norway (I was there earlier this month) all I saw were Lion's Mane, and they were pretty much everywhere I might have considered swimming (if the water weren't so bloomin' cold).
 
LONG_KEELER said:
On the tropical East Coast of the UK , I've noticed spike readings on the echo sounder.

Could these be caused by jellyfish ? Or perhaps all the bloom growing on the mud ?

Also, have you had a swim yet and do jellyfish sting much ? I'm tempted.
Click to expand...

The density of a jellyfish must be very close to that of water, so you would get very little reflection. When you drive an outboard through a swarm of them you can almost hear the splatting going on as the propeller unmantles them.
 
ALERT:~

I have just been notified that Portuguese Men Of War Jellyfish have just this morning been spotted off Estepona on the Costa Del Sol, approximately one mile out.
 
VO5 said:
ALERT:~

I have just been notified that Portuguese Men Of War Jellyfish have just this morning been spotted off Estepona on the Costa Del Sol, approximately one mile out.
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When God created all the animals, I wish (S)He had either gone "on second thoughts, maybe not" or, at the very least, scrapped all the stingers. The seas would be a more welcoming place without. :disgust:
 
JumbleDuck said:
lots of Moon jellyfish, certainly on the Clyde. In fact, there is a BBC news story about them today:

http://www.bbc.co.uk/news/uk-scotland-36916594
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That's interesting - thanks.

Apparently jellyfish are on the menu in a Portuguese restaurant. Not sure what species though.

If your engine overheats and you suffer a near miss in a shipping lane lets keep positive.

After clearing out your intake filter you could have jellyfish and chips along with an algae burger and even a squid sausage for tea.

I
 
Do echo sounders cause jelly fish problems?

They may just be getting their own back!;)

What makes you think it's jelly fish? There seems to be an unusual profusion of weed around parts of the East Coast (and perhaps elsewwhere) at the moment. I imagine clumps of that might add a few fale readings to an echo sounder.
 
LONG_KEELER said:
Also, have you had a swim yet and do jellyfish sting much ? I'm tempted.
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yes, had several this week. Lovely and warm. Can't remember it as warm as this. Most of the jellyfish around are the moon ones (and quite small) which are not much of an issue. However, I did notice a bit further out a couple with long tentacles, which are a bit more irritating when swimming.
 
VO5 said:
ALERT:~

I have just been notified that Portuguese Men Of War Jellyfish have just this morning been spotted off Estepona on the Costa Del Sol, approximately one mile out.
Click to expand...

Thats interesting........ was swimming in the anchorage just outside Estepona on tuesday. :ambivalence:

The sea was really clear and clean. Will rethink that next week when Im up that way! Thanks for the warning.

Saw some whales off Europa Point and a massive pod of dolphins. Oh, and the submarine departing.
 
AntarcticPilot said:
Lion's Mane is also found in the UK. In fact there's a Sherlock Holmes story about it, though it does exaggerate the likely effects.
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On more than one occasion we have had to quickly divert the dive boat into Ballycastle so someone could do a dash up the high street to the fish and chip shop for the vinegar bottle. The tentacles tend to catch on the shot line so when a diver descends or surfaces they catch you normally across the lips.

Pete
 
Pete7 said:
On more than one occasion we have had to quickly divert the dive boat into Ballycastle so someone could do a dash up the high street to the fish and chip shop for the vinegar bottle. The tentacles tend to catch on the shot line so when a diver descends or surfaces they catch you normally across the lips.
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I get sniggered at for wearing marigolds when handling mooring strops or my anchor line, but been stung once too often to care what people think.
 
LONG_KEELER said:
On the tropical East Coast of the UK , I've noticed spike readings on the echo sounder.

Could these be caused by jellyfish ? Or perhaps all the bloom growing on the mud ?

Also, have you had a swim yet and do jellyfish sting much ? I'm tempted.
Click to expand...

Swam in the Roach last weekend. Plenty of Moon jellyfish brushed by me, but none of them stung me.
 
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